MB&UE Working Group Meeting
June 17, 2011
Some PYTHIA LHC Tunes
CMS
Rick Field
University of Florida
Outline of Talk
LHC PYTHIA Tunes: Rick’s PYTHIA 6.4 tunes (Z1, Z2), Peter’s PYTHIA
6.4 Perugia 2011 tunes (S350, S356), and PYTHIA 8 Tune 4C (Corke &
Sjöstrand).
ATLAS
Baryon and Strange Particle Production at the LHC:
Fragmentation tuning.
p
K
Kshort
u s
d s +d s
+
uud
Λ
Ξ−
dss
ud s
K-
u s
LPCC MB&UE Meeting
CERN June 17, 2011
UE&MB@CMS
Rick Field – Florida/CDF/CMS
Page 1
PYTHIA 6.4.25
Tune Z1
Tune Z2
Tune S350
Tune S356
--------------------------------------------------------------------4th generation: tunes incorporating 7-TeV data
PYTUNE
--------------------------------------------------------------------340 AMBT1
: 1st ATLAS tune incl 7 TeV, w. LO* PDFs
(2010)
341 Z1
: Retune of AMBT1 by Field w CTEQ5L PDFs
(2010)
342 Z1-LEP : Retune of Z1 by Skands w CTEQ5L PDFs
(2010)
343 Z2
: Retune of Z1 by Field w CTEQ6L1 PDFs
(2010)
344 Z2-LEP : Retune of Z1 by Skands w CTEQ6L1 PDFs
(2010)
350 Perugia 2011 : Retune of Perugia 2010 incl 7-TeV data (Mar 2011)
351 P2011 radHi : Variation with alphaS(pT/2)
352 P2011 radLo : Variation with alphaS(2pT)
353 P2011 mpiHi : Variation with more semi-hard MPI
354 P2011 noCR : Variation without color reconnections
355 P2011 LO** : Perugia 2011 using MSTW LO** PDFs
(Mar 2011)
356 P2011 C6 : Perugia 2011 using CTEQ6L1 PDFs
(Mar 2011)
357 P2011 T16 : Variation with PARP(90)=0.16 away from 7 TeV
358 P2011 T32 : Variation with PARP(90)=0.32 awat from 7 TeV
359 P2011 TeV : Perugia 2011 optimized for Tevatron (Mar 2011)
360 S Global : Schulz-Skands Global fit
(Mar 2011)
361 S 7000 : Schulz-Skands at 7000 GeV
(Mar 2011)
362 S 1960 : Schulz-Skands at 1960 GeV
(Mar 2011)
363 S 1800 : Schulz-Skands at 1800 GeV
(Mar 2011)
364 S 900
: Schulz-Skands at 900 GeV
(Mar 2011)
365 S 630
: Schulz-Skands at 630 GeV
(Mar 2011)
=========================================================
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
CTEQ5L
CTEQ6L
CTEQ5L
CTEQ6L
Page 2
Min-Bias Collisions
Charged Particle Density: dN/dη
η
Charged Particle Density: dN/dη
η
6
CMS Data
ALICE Data
PYTHIA Tune Z1
PYTHIA Tune Z1
Charged Particle Density
Charged Particle Density
8
6
NSD = ND + DD
4
Tune Z1
CMS
2
pyZ1 ND = dashed
pyZ1 NSD = solid
7 TeV
NSD (all pT)
4
2
Tune Z1
INEL (all pT)
0
ALICE
INEL = NSD + SD
pyZ1 NSD = dashed
pyZ1 INEL = solid
900 GeV
0
-4
-3
-2
-1
0
1
2
3
4
-4
-3
Pseudo-Rapidity η
-2
-1
0
1
2
3
Pseudo-Rapidity η
CMS NSD data on the charged particle
rapidity distribution at 7 TeV compared
with PYTHIA Tune Z1. The plot shows
the average number of particles per NSD
collision per unit η, (1/NNSD) dN/dη
η.
ALICE NSD data on the charged particle
rapidity distribution at 900 GeV compared
with PYTHIA Tune Z1. The plot shows
the average number of particles per INEL
collision per unit η, (1/NINEL) dN/dη
η.
“Minimum Bias” Collisions
Okay not perfect, but remember
Proton
we know that SD and DD are not modeled well!
Proton
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 3
4
MB versus UE
Divide be 2π
π
Charged Particle Density: dN/dη
η
2.5
8
CMS Data
CMS Data
PYTHIA Tune Z1
PYTHIA Tune Z1
Charged Particle Density
Charged Particle Density
Charged Particle Density: dN/dη
ηdφ
φ
6
NSD = ND + DD
4
Tune Z1
CMS
2
pyZ1 ND = dashed
pyZ1 NSD = solid
7 TeV
NSD (all pT)
2.0
1.5
1.0
0.5
pyZ1 ND = dashed
7 TeV
NSD (all pT)
pyZ1 NSD = solid
0.0
0
-4
-3
-2
-1
0
1
2
3
4
-4
-3
-2
-1
0
1
2
3
4
Pseudo-Rapidity η
Pseudo-Rapidity η
CMS NSD data on the charged particle
CMS NSD data on the charged particle rapidity
rapidity distribution at 7 TeV compared
distribution at 7 TeV compared with PYTHIA
with PYTHIA Tune Z1. The plot shows
Tune Z1. The plot shows the average number of
the average number of charged particles
charged particles per NSD collision per unit η−φ,
per NSD collision per unit η, (1/NNSD)
(1/NNSD) dN/dη
ηdφ
φ.
dN/dη
η.
“Minimum Bias” Collisions
Proton
LPCC MB&UE Meeting
CERN June 17, 2011
Proton
Rick Field – Florida/CDF/CMS
Page 4
MB versus UE
Charged Particle Density: dN/dη
ηdφ
φ
ηdφ
φ
Transverse Charged Particle Density: dN/dη
2.5
RDF Preliminary
CMS Data
PYTHIA Tune Z1
PYTHIA Tune Z1
Charged Particle Density
Charged Particle Density
2.5
2.0
Factor of 2!
1.5
1.0
Charged Particles (|η
η| < 2, all pT)
0.5
Tune Z1
CMS
2.0
Tune Z1
1.0
0.5
7 TeV ND
pyZ1 ND = dashed
7 TeV
NSD (all pT)
0.0
NSD = ND + DD
1.5
pyZ1 NSD = solid
0.0
0
5
10
15
20
25
-4
-3
-2
-1
0
1
2
3
Pseudo-Rapidity η
PT max (GeV/c)
Shows the density of charged particles in
the “transverse” region as a function of
PTmax for charged particles (All pT, |η
η| <
2) at 7 TeV from PYTHIA Tune Z1.
Outgoing Parton
CMS NSD data on the charged particle rapidity
distribution at 7 TeV compared with PYTHIA
Tune Z1. The plot shows the average number of
charged particles per NSD collision per unit η−φ,
(1/NNSD) dN/dη
ηdφ
φ.
PT(hard)
“Minimum Bias” Collisions
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Proton
Underlying Event
Proton
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 5
MB versus UE
Charged Particle Density: dN/dη
ηdφ
φ
ηdφ
φ
"Transverse" Charged Particle Density: dN/dη
2.5
CMS Data
ATLAS
2.0
Charged Particle Density
"Transverse" Charged Density
2.5
Factor of 2!
1.5
RDF Preliminary
1.0
ATLAS corrected data
Tune Z1 generator level
0.5
Charged Particles (pT > 0.1 GeV/c, |η
η|<2.5)
7 TeV
CMS
PYTHIA Tune Z1
2.0
Tune Z1
1.0
0.5
pyZ1 ND = dashed
7 TeV
NSD (all pT)
0.0
NSD = ND + DD
1.5
pyZ1 NSD = solid
0.0
0
2
4
6
8
10
12
14
16
18
20
-4
-3
PTmax (GeV/c)
-2
-1
0
1
2
3
Pseudo-Rapidity η
ATLAS data on the density of charged
particles in the “transverse” region as a
function of PTmax for charged particles
(pT > 0.1 GeV/c, |η
η| < 2.5) at 7 TeV
compared with PYTHIA Tune Z1.
Outgoing Parton
CMS NSD data on the charged particle rapidity
distribution at 7 TeV compared with PYTHIA
Tune Z1. The plot shows the average number of
charged particles per NSD collision per unit η−φ,
(1/NNSD) dN/dη
ηdφ
φ.
PT(hard)
“Minimum Bias” Collisions
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Proton
Underlying Event
Proton
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 6
Baryon & Strange Particle
Production at the LHC
Strange Particle Production in Proton-Proton Collisions at 900 GeV with
ALICE at the LHC, arXiv:1012.3257 [hep-ex] December 18, 2010.
INEL
Production of Pions, Kaons and Protons in pp Collisions at 900 GeV with
ALICE at the LHC, arXiv:1101.4110 [hep-ex] January 25, 2011.
INEL
Strange Particle Production in pp Collisions at 900 GeV and 7 TeV, CMS
Paper: arXiv:1102.4282 [hep-ex] Feb 21, 2011, submitted to JHEP.
Step 1: Look at the overall particle yields (all pT).
-
K
K
Kshort
p
u s
u s
d s +d s
uud
+
Λ
Ξ−
ud s
dss
NSD
I know there are
more nice results
from the LHC, but
this is all I can show
today. Sorry!
Step 2: Look at the ratios of the overall particle yields (all pT).
(K++ K-)
(π
π++ π-)
(p + p)
(π
π++ π-)
=
Strange Meson
Non-strange Meson
=
Non-strange Baryon
Non-strange Meson
Kshort
(π
π++ π-)
=
Strange Meson
Non-strange Meson
Single-strange Baryon
(Λ
Λ + Λ)
=
2Kshort
Strange Meson
(Ξ
Ξ + Ξ)
2Kshort
Double-strange Baryon
=
Strange Meson
Step 3: Look at the pT dependence of the particle yields and ratios.
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 7
Kaon Production
Kshort Rapidity Distribution: dN/dY
Kshort Rapidity Distribution: dN/dY
0.5
0.4
CMS
CMS Data
PYTHIA Tune Z1
0.4
CMS & ALICE Data
INEL = NSD + SD
PYTHIA Tune Z1
7 TeV
0.3
dN/dY
dN/dY
CMS NSD
0.3
0.2
900 GeV
900 GeV
0.2
0.1
0.1
ALICE INEL
Tune Z1
NSD (all pT)
0.0
pyZ1 NSD = solid
Tune Z1
pyZ1 INEL = dashed
0.0
-4
-3
-2
-1
0
1
2
3
4
-4
-3
Rapidity Y
-2
-1
0
1
2
3
Rapidity Y
CMS NSD data on the Kshort rapidity
distribution at 7 TeV and 900 GeV
compared with PYTHIA Tune Z1. The
plot shows the average number of Kshort
per NSD collision per unit Y, (1/NNSD)
dN/dY.
CMS NSD data on the Kshort rapidity
distribution at 900 GeV and the ALICE
point at Y = 0 (INEL) compared with
PYTHIA Tune Z1. The ALICE point is the
average number of Kshort per INEL collision
per unit Y at Y = 0, (1/NINEL) dN/dY.
“Minimum Bias” Collisions
Proton shortage of Kaons in PYTHIA
No overall
Proton Tune Z1!
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 8
4
Kaon Production
Kshort Rapidity Distribution: dN/dY
Kshort
0.5
CMS
PYTHIA Tune Z1
0.4
0.4
0.5
CMS Data
Kshort Rapidity Distribution: dN/dY
Rapidity Distribution: dN/dY
CMS & ALICE Data
CMS Data
PYTHIA Tune Z1
PYTHIA Tune
Z1 & S350
7 TeV
0.3
0.2
0.1
dN/dY
0.3
dN/dY
dN/dY
0.4
0.3
900 GeV
0.2
-3
900 GeV
0.2
0.1
ALICE INEL
900 GeV
0.1
0.0
-4
CMS7NSD
TeV
Tune Z1
NSD (all pT)
-2
-1
0.0
0
NSD1 (all pT)2
3
4
-4
-3
Rapidity Y
0.0
-4
-3
INEL = NSD + SD
-2
CMS NSD data on the Kshort rapidity
distribution at 7 TeV and 900 GeV
compared with PYTHIA Tune Z1. The
plot shows the average number of Kshort
per NSD collision per unit Y, (1/NNSD)
dN/dY.
-1
0
1
pyZ1 = solid
-2
pyS350
= -1
dashed 0
Rapidity Y
2
pyZ1 NSD = solid
Tune Z1
3
pyZ1 INEL = dashed
1
2
3
4
CMS NSD data on the Kshort rapidity
Rapidity Y
distribution at 900 GeV and the ALICE
point at Y = 0 (INEL) compared with
PYTHIA Tune Z1. The ALICE point is the
average number of Kshort per INEL collision
per unit Y at Y = 0, (1/NINEL) dN/dY.
“Minimum Bias” Collisions
Proton shortage of Kaons in PYTHIA
No overall
Proton Tune Z1!
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 9
4
Kaon Production
CMS measures (1/NNSD) dN/dY
Kshort Rapidity Distribution: dN/dY
0.5
CMS Data
PYTHIA Tune Z1
dN/dY
0.4
7 TeV
0.3
0.2
900 GeV
0.1
I have plotted the same data twice!
NSD (all pT)
This is the
correct way!
0.0
-4
-3
-2
-1
0
1
2
3
4
Rapidity Y
versus |Y| from 0 → 2
Rick’s plot of the CMS NSD data on the
Kshort rapidity distribution at 7 TeV and 900
GeV. The plot shows the average number of
Kshort per NSD collision per unit Y, (1/NNSD)
dN/dY, versus Y from -2 → 2.
Real CMS NSD data on the Kshort rapidity
distribution at 7 TeV and 900 GeV. The
plot shows the average number of Kshort per
NSD collision per unit Y, (1/NNSD) dN/dY,
versus |Y| from 0 → 2.
Warning: I am not plotting what CMS actually measures!
I am old and I like to see both sides so I assumed symmetry about Y = 0 and plotted the same data on both
sides (Y → -Y). The way CMS does it is the correct way! But my way helps me see better what is going on.
Please refer to the CMS publication for the official plots!
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 10
Kaon Production
Charged Kaons Rapidity: dN/dY
Rapidity Distribution Ratio: Kaons/Pions
0.3
0.6
ALICE Data
+
ALICE Data
(K +K )
dN/dY
0.4
0.2
Tune Z1
900 GeV
INEL (all pT)
+
π++π
π-)
(K +K )/(π
ALICE
PYTHIA Tune Z1
dN/dY Particle Ratio
ALICE
PYTHIA Tune Z1
-
0.2
0.1
pyZ1 NSD = dashed
pyZ1 INEL = solid
Tune Z1
900 GeV
INEL (all pT)
0.0
0.0
-4
-3
-2
-1
0
1
2
3
4
-4
-3
-2
-1
0
1
2
3
Rapidity Y
ALICE INEL data on the charged kaon
rapidity distribution at 900 GeV compared
with PYTHIA Tune Z1. The plot shows
the average number of charged kaons per
INEL collision per unit Y at Y = 0,
(1/NINEL) dN/dY.
ALICE INEL data on the charged kaon to
charged pion rapidity ratio at 900 GeV
compared with PYTHIA Tune Z1.
(K++ K-)
(π
π++ π-)
=
Strange Meson
Non-strange Meson
“Minimum Bias” Collisions
Protonshortage of Kaons in PYTHIA
ProtonTune Z1!
No overall
LPCC MB&UE Meeting
CERN June 17, 2011
4
Rapidity Y
Rick Field – Florida/CDF/CMS
Page 11
Kaon Production
Charged Kaons Rapidity: dN/dY
Rapidity Distribution Ratio: Kaons/Pions
Rapidity Distribution Ratio: Kshort/Kaons
0.3
0.8
0.6
ALICE Data
ALICE Data
ALICE
dN/dY
0.4
0.2
PYTHIA Tune Z1
ALICE Data
-
Kshort/(K++K-)
(K +K )
0.6
0.4
0.2
0.2
0.1
pyZ1 NSD = dashed
GeV
TuneINEL
Z1(all pT)
pyZ1 INEL900
= solid
900 GeV
INEL (all pT)
0.0
INEL (all pT)
-3
-2
-1
0
Tune Z1
900 GeV
0.0
0.0
-4
+
π++π
π-)
(K +K )/(π
ALICE
PYTHIA Tune Z1
dN/dY Particle Ratio
dN/dY Particle Ratio
PYTHIA Tune Z1
+
-4 1
-3 2
-2 3
-1 4
Rapidity Y
0
-4
1
-3 2
-2 3
0
1
2
3
ALICE INEL data on the charged kaon to
charged pion rapidity ratio at 900 GeV
compared with PYTHIA Tune Z1.
(K++ K-)
(π
π++ π-)
=
Strange Meson
Non-strange Meson
“Minimum Bias” Collisions
Protonshortage of Kaons in PYTHIA
ProtonTune Z1!
No overall
LPCC MB&UE Meeting
CERN June 17, 2011
4
Rapidity Y
Rapidity Y
ALICE INEL data on the charged kaon
rapidity distribution at 900 GeV compared
with PYTHIA Tune Z1. The plot shows
the average number of charged kaons per
INEL collision per unit Y at Y = 0,
(1/NINEL) dN/dY.
-1 4
Rick Field – Florida/CDF/CMS
Page 12
Kaon Production
Charged Kaons Rapidity: dN/dY
Rapidity Distribution Ratio: Kaons/Pions
Rapidity Distribution Ratio: Kshort/Kaons
Kaons/Pions
0.3
0.8
0.3
ALICE Data
ALICE
Data
ALICE
Data(K++K-)
ALICE
dN/dY Particle
Particle Ratio
Ratio
dN/dY
PYTHIA Tune Z1
dN/dY
0.4
0.2
+ - ALICE Data
+
- /(K
+K
short
π++π
π) )
(KK
+K
)/(π
0.6
0.2
0.4
0.1
0.2
0.2
0.1
pyZ1 = solid
pyS350 = dashed
900 GeV
INEL (all pT)
pyZ1 NSD = dashed
GeV
TuneINEL
Z1(allpT)
900
GeV
pyZ1 INEL900
= solid
INEL(all
pT)
900 GeV
INEL (all pT)
0.0
0.0
0.0
-4
-3
-2
-1
0
+
π++π
π-)
(K +K )/(π
ALICE
PYTHIA Tune Z1
PYTHIA Tune
Tune Z1
Z1 & S350
PYTHIA
dN/dY Particle Ratio
0.6
Tune Z1
0.0
-4 1
-4
-3
-3 2
-2
-2 3
-1
-1 4
00
-4 11
-3 22
-2 33
Rapidity
Rapidity YY
Rapidity Y
ALICE INEL data on the charged kaon
rapidity distribution at 900 GeV compared
with PYTHIA Tune Z1. The plot shows
the average number of charged kaons per
INEL collision per unit Y at Y = 0,
(1/NINEL) dN/dY.
-1 44
0
1
2
3
ALICE INEL data on the charged kaon to
charged pion rapidity ratio at 900 GeV
compared with PYTHIA Tune Z1.
(K++ K-)
(π
π++ π-)
=
Strange Meson
Non-strange Meson
“Minimum Bias” Collisions
Protonshortage of Kaons in PYTHIA
ProtonTune Z1!
No overall
LPCC MB&UE Meeting
CERN June 17, 2011
4
Rapidity Y
Rick Field – Florida/CDF/CMS
Page 13
1/σ dσ/dxp
LEP: Kshort Spectrum
91 GeV ee
Z (hadronic)
0
K spectrum (particle-level)
102
ALEPH
Pythia
(350:P2011)
S350 6Perugia
2011
Pythia 6 (340:AMBT1)
Pythia 6 (327:P2010)
Pythia 6 (129:Pro-Q2O)
Pythia 6 (343:Z2)
10
1
mcplots.cern.ch
10-1
ALEPH_1996_S3486095
10-2
Pythia 6.425
0
0.2
0.4
0.6
0.8
xp
Ratio
to ALEPH
Theory/Data
1.5
1
0.5
LPCC MB&UE Meeting
CERN June 17, 2011
0
Rick Field – Florida/CDF/CMS
0.2
0.4
0.6
0.8
Page 14
Lambda Production
(Lam+LamBar) Rapidity Distribution: dN/dY
0.25
Rapidity Distribution Ratio: (Lam+LamBar)/(2Kshort)
0.5
_
CMS Data
(Λ
Λ+Λ
Λ)
7 TeV
PYTHIA Tune Z1
dN/dY Particle Ratio
dN/dY
0.20
0.15
0.10
900 GeV
0.05
CMS
NSD (all pT)
0.00
-4
-3
-2
-1
1
_
CMS
0.4
(Λ
Λ+Λ
Λ)/(2Kshort)
7 TeV
0.3
0.2
Factor of 1.5!
0.1
Tune Z1
NSD (all pT)
Tune Z1
0
CMS Data
PYTHIA Tune Z1
0.0
2
3
4
-4
-3
-2
Rapidity Y
-1
0
1
2
3
4
Rapidity Y
CMS NSD data on the Lambda+AntiLambda CMS NSD data on the Lambda+AntiLambda
rapidity distribution at 7 TeV and 900 GeV
to 2Kshort rapidity ratio at 7 TeV compared
compared with PYTHIA Tune Z1. The plot
with PYTHIA Tune Z1.
shows the average number of particles per
Single-strange Baryon
(Λ
Λ + Λ)
=
NSD collision per unit Y, (1/NNSD) dN/dY.
2K
short
Strange Meson
“Minimum Bias” Collisions
Proton Tune Z1!
Oops!Proton
Not enough Lambda’s in PYTHIA
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 15
Lambda Production
(Lam+LamBar)
(Lam+LamBar) Rapidity
Rapidity Distribution:
Distribution: dN/dY
dN/dY
dN/dY
dN/dY
0.20
0.20
0.5
0.5
_
_
CMSCMS
DataData
Λ))
Λ+Λ
Λ
(Λ
7
7 TeV
TeV
PYTHIA
PYTHIATune
TuneZ1
Z1 & S350
0.15
0.15
0.10
0.10
900 GeV
0.05
0.05
NSD(all
(allpT)
pT)
NSD
0.00
0.00
-4
-4
-3
-3
CMS
-2
-2
-1
-1
Tune Z1
00
1
1
CMSCMS
DataData
PYTHIA
PYTHIATune
TuneZ1
Z1 & S350
dN/dY Particle
Particle Ratio
Ratio
dN/dY
0.25
0.25
RapidityDistribution
DistributionRatio:
Ratio: (Lam+LamBar)/(2Kshort)
(Lam+LamBar)/(2Kshort)
Rapidity
pyZ1 = solid
pyS350 = dashed
0.4
0.4
__
CMS
(Λ
+Λ
)/(2Kshort
(Λ
))
ΛΛ+Λ
ΛΛ)/(2K
short
TeV
77TeV
0.3
0.3
0.2
0.2
Factor of 1.5!
0.1
0.1
pyZ1 = solid
Tune Z1pyS350 = dashed
NSD
NSD (all
(all pT)
pT)
0.0
0.0
2
2
33
44
-4
-4
-3
-3
-2
-2
Rapidity Y
Y
Rapidity
-1
-1
00
11
22
33
44
Rapidity
RapidityYY
CMS NSD data on the Lambda+AntiLambda CMS NSD data on the Lambda+AntiLambda
rapidity distribution at 7 TeV and 900 GeV
to 2Kshort rapidity ratio at 7 TeV compared
compared with PYTHIA Tune Z1. The plot
with PYTHIA Tune Z1.
shows the average number of particles per
Single-strange Baryon
(Λ
Λ + Λ)
=
NSD collision per unit Y, (1/NNSD) dN/dY.
2K
short
Strange Meson
“Minimum Bias” Collisions
Proton Tune Z1!
Oops!Proton
Not enough Lambda’s in PYTHIA
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 16
1/σ dσ/dxp
LEP: Λ Spectrum
91 GeV ee
Z (hadronic)
Lambda0 spectrum (particle-level)
10
ALEPH
Pythia 6
(350:P2011)
S350
Perugia
2011
Pythia 6 (340:AMBT1)
Pythia 6 (327:P2010)
Pythia 6 (129:Pro-Q2O)
Pythia 6 (343:Z2)
1
10-1
mcplots.cern.ch
10-2
ALEPH_1996_S3486095
Pythia 6.425
-3
10
0
0.2
0.4
0.6
0.8
xp
Ratio to ALEPH
Theory/Data
1.5
1
0.5
LPCC MB&UE Meeting
CERN June 17, 2011
0
Rick Field – Florida/CDF/CMS
0.2
0.4
0.6
0.8
Page 17
Cascade Production
Rapidity Distribution Ratio: (Cas+CasBar)/(2Kshort)
(Cas+CasBar) Rapidity Distribution: dN/dY
0.03
CMS Data
−
dN/dY Particle Ratio
7 TeV
dN/dY
0.02
CMS
900 GeV
0.01
PYTHIA Tune Z1
0.04
7 TeV
0.03
Factor of 2!
0.02
0.01
Tune Z1
NSD (all pT)
Ξ −+Ξ
Ξ −)/(2Kshort)
(Ξ
CMS
CMS Data
−
(Ξ
Ξ +Ξ
Ξ )
PYTHIA Tune Z1
_
0.05
_
Tune Z1
NSD (all pT)
0.00
0.00
-4
-3
-2
-1
0
1
2
3
4
-4
-3
-2
-1
0
1
2
3
4
Rapidity Y
Rapidity Y
CMS NSD data on the Cascade CMS data on the Cascade-+AntiCascade- to
+AntiCascade- rapidity distribution at 7 TeV
2Kshort rapidity ratio at 7 TeV compared with
and 900 GeV compared with PYTHIA Tune
PYTHIA Tune Z1.
Z1. The plot shows the average number of
Double-strange Baryon
(Ξ
Ξ + Ξ)
=
particles per NSD collision per unit Y,
2Kshort
Strange Meson
(1/NNSD) dN/dY.
“Minimum Bias” Collisions
Proton Tune Z1!
Yikes! Proton
Way too few Cascade’s in PYTHIA
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 18
Cascade Production
(Cas+CasBar) Rapidity Distribution: dN/dY
CMS
Data
CMS
Data
−−
0.05
0.05
_
CMS
Data
CMS
Data
−−
+Ξ
Ξ ))
(Ξ
Ξ +Ξ
Ξ
PYTHIA Tune Z1 & S350
dN/dY Particle Ratio
0.03
0.03
7 TeV
0.02
0.02
dN/dY
dN/dY
pyZ1 = solid
CMS
pyS350 = dashed
900
900 GeV
GeV
0.01
0.01
0.00
0.00
-4
-4
-3
-3
-2
-2
-1
-1
0
0
1
1
0.04
PYTHIATune
TuneZ1
Z1& S350
PYTHIA
Ξ−+Ξ
(Ξ
+Ξ
)/(2Kshort
ΞΞ−)/(2K
(Ξ
))
Ξ
short
CMS
TeV
77 TeV
0.03
Factor of 2!
0.02
0.01
0.01
pyZ1 = solid
Tune Z1pyS350 = dashed
NSD (all
(all pT)
pT)
NSD
Tune Z1
NSD (all pT)
NSD (all pT)
Rapidity Distribution
Distribution Ratio:
Ratio: (Cas+CasBar)/(2Kshort)
(Cas+CasBar)/(2Kshort)
Rapidity
__−
−
0.00
0.00
2
2
3
3
4
4
-4
-4
-3
-3
Rapidity Y
Y
Rapidity
-2
-2
-1
-1
00
11
22
33
44
Rapidity
Rapidity Y
Y
CMS NSD data on the Cascade CMS data on the Cascade-+AntiCascade- to
+AntiCascade- rapidity distribution at 7 TeV
2Kshort rapidity ratio at 7 TeV compared with
and 900 GeV compared with PYTHIA Tune
PYTHIA Tune Z1.
Z1. The plot shows the average number of
Double-strange Baryon
(Ξ
Ξ + Ξ)
=
particles per NSD collision per unit Y,
2Kshort
Strange Meson
(1/NNSD) dN/dY.
“Minimum Bias” Collisions
Proton Tune Z1!
Yikes! Proton
Way too few Cascade’s in PYTHIA
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 19
1/σ dσ/dxE
LEP: Ξ Spectrum
91 GeV ee
Z (hadronic)
1
-
Ξ spectrum (particle-level)
ALEPH
Pythia
(350:P2011)
S350 6Perugia
2011
Pythia 6 (340:AMBT1)
Pythia 6 (327:P2010)
Pythia 6 (129:Pro-Q2O)
Pythia 6 (343:Z2)
mcplots.cern.ch
10-1
ALEPH_1996_S3486095
10-2
Pythia 6.425
0.1
0.2
0.3
0.4
0.5
xE
Ratio
to ALEPH
Theory/Data
1.5
1
0.5
LPCC MB&UE Meeting
CERN June 17, 2011
0.1
Rick Field – Florida/CDF/CMS
0.2
0.3
0.4
0.5
Page 20
PYTHIA Fragmentation
Parameters
Can we increase the overall rate of strange baryons by varying a few
fragmentation parameters? For now ignore e+e-!
PARJ(1) : (D = 0.10) is P(qq)/P(q), the suppression of diquark-antidiquark pair production in
the colour field, compared with quark–antiquark production. Notation: PARJ(1) = qq/q
PARJ(2) : (D = 0.30) is P(s)/P(u), the suppression of s quark pair production in the field
compared with u or d pair production. Notation: PARJ(2) = s/u.
PARJ(3) : (D = 0.4) is (P(us)/P(ud))/(P(s)/P(u)), the extra suppression of strange diquark
production compared with the normal suppression of strange quarks.
Notation: PARJ(3) = us/u .
This work is in progress!
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 21
PYTHIA Fragmentation
Parameters
Can we increase the overall rate of strange baryons by varying a few
fragmentation parameters? For now ignore e+e-!
Warning! This may cause problems
fitting
the LEP data.
If so
PARJ(1) : (D = 0.10) is P(qq)/P(q),
the suppression
of diquark-antidiquark
pair production in
the colour field, compared withwe
quark–antiquark
production.
must understand
why! Notation: PARJ(1) = qq/q
We do not want one tune for
+e- and
anotherofone
for pair production in the field
PARJ(2) : (D = 0.30) is P(s)/P(u),ethe
suppression
s quark
compared with u or d pair production.
Notation: collisions!
PARJ(2) = s/u.
hadron-hadron
PARJ(3) : (D = 0.4) is (P(us)/P(ud))/(P(s)/P(u)), the extra suppression of strange diquark
production compared with the normal suppression of strange quarks.
Notation: PARJ(3) = us/u .
This work is in progress!
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 22
PYTHIA Fragmentation
Parameters
Rapidity Distribution Ratio: (Lam+LamBar)/(2Kshort)
Rapidity Distribution Ratio: Kaons/Pions
0.5
0.3
s/u: 0.3 -> 0.5
dN/dY Particle Ratio
PYTHIA Tune Z1
0.2
-
+
-
PYTHIA Tune Z1
us/s: 0.4 -> 1.0
0.1
Z1 default
qq/q: 0.1 -> 0.2
Λ+Λ
Λ)/(2Kshort)
(Λ
qq/q: 0.1 -> 0.2
0.4
0.3
0.2
us/s: 0.4 -> 1.0
0.1
s/u: 0.3 -> 0.5
Z1 default
7 TeV
NSD (all pT)
900 GeV
INEL (all pT)
_
CMS Data
(K +K )/(π
π +π
π)
+
dN/dY Particle Ratio
ALICE Data
0.0
0.0
-4
-3
-2
-1
0
1
2
3
-4
4
-3
-2
-1
0
1
2
3
4
Rapidity Y
Rapidity Y
Rapidity Distribution Ratio: (Cas+CasBar)/(2Kshort)
0.05
−
CMS Data
dN/dY Particle Ratio
PYTHIA Tune Z1C: Same as Tune
Z1 except qq/q is increased 0.1 → 0.12
and us/s is increased from 0.4 → 0.8.
PYTHIA Tune Z1
0.04
_
−
(Ξ
Ξ −+Ξ
Ξ −)/(2Kshort)
qq/q: 0.1 -> 0.2
us/s: 0.4 -> 1.0
0.03
0.02
s/u: 0.3 -> 0.5
0.01
NSD (all pT)
Z1 default
7 TeV
0.00
-4
-3
-2
-1
0
1
2
3
Rapidity Y
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 23
4
Kaon Production
Kshort Rapidity Distribution: dN/dY
Kshort Rapidity Distribution: dN/dY
0.5
0.5
CMS Data
PYTHIA Tune Z1
PYTHIA Tune Z1C
Charged Particle Ratio
dN/dY
0.4
CMS Data
7 TeV
0.3
0.2
900 GeV
0.1
CMS
NSD (all pT)
0.4
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
0.3
0.2
900 GeV
0.1
Tune Z1
CMS
NSD (all pT)
0.0
7 TeV
Tune Z1C
0.0
-4
-3
-2
-1
0
1
2
3
4
-4
-3
Rapidity Y
-2
-1
0
1
2
3
Rapidity Y
CMS dNSD ata on the Kshort rapidity
CMS NSD data on the Kshort rapidity
distribution at 7 TeV and 900 GeV
distribution at 7 TeV and 900 GeV compared
compared with PYTHIA Tune Z1C. The
with PYTHIA Tune Z1. The plot shows the
plot shows the average number of Kshort per
average number of Kshort per NSD collision
NSD collision per unit Y, (1/NNSD) dN/dY.
per unit Y, (1/NNSD) dN/dY.
“Minimum Bias” Collisions
Proton
Proton
For Kaon production
Tune Z1 and Z1C are
almost identical!
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 24
4
Kaon Production
Kshort Rapidity Distribution: dN/dY Rapidity Distribution Ratio: Kaons/Pions
Kshort Rapidity Distribution: dN/dY
0.5
0.2
Charged Particle Ratio
dN/dY Particle Ratio
0.3
CMS Data
ALICE Data
PYTHIA
7 TeV Tune Z1 & Z1C
PYTHIA Tune Z1
0.4
dN/dY
0.5
0.3
CMS Data
0.2
9000.1
GeV
0.1
CMS
NSD (all pT)
Tune Z1
INEL (all pT)
0.0
-4
-3
-2
-1
900 GeV
0
Rapidity Y
0.0
1
-4
2
-3
Tune Z1C
(K +K
)/(π
π +π
π 0.12
)
PYTHIA Tune Z1C
qq/q:
0.1
->
0.4
+
-
+
-
7 TeV
us/s: 0.4 -> 0.8
0.3
Z1C
0.2
900 GeV
Z1
0.1Tune Z1C
CMS
qq/q: 0.1 -> 0.12
NSD (all pT)
us/s: 0.4 -> 0.8
Tune Z1C
0.0
3
-2
4
-1
-4
0
-3
1
Rapidity Y
-2
2
-1
3
0
4
1
2
3
Rapidity Y
CMS dNSD ata on the Kshort rapidity
CMS NSD data on the Kshort rapidity
distribution at 7 TeV and 900 GeV
distribution at 7 TeV and 900 GeV compared
compared with PYTHIA Tune Z1C. The
with PYTHIA Tune Z1. The plot shows the
plot shows the average number of Kshort per
average number of Kshort per NSD collision
NSD collision per unit Y, (1/NNSD) dN/dY.
per unit Y, (1/NNSD) dN/dY.
“Minimum Bias” Collisions
Proton
Proton
For Kaon production
Tune Z1 and Z1C are
almost identical!
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 25
4
Lambda Production
(Lam+LamBar) Rapidity Distribution: dN/dY
(Lam+LamBar) Rapidity Distribution: dN/dY
0.25
0.25
_
CMS Data
(Λ
Λ+Λ
Λ)
PYTHIA Tune Z1
dN/dY
0.20
0.15
0.10
900 GeV
0.05
0.00
-4
-3
-2
-1
7 TeV
0.20
(Λ
Λ+Λ
Λ)
CMS
0.15
0.10
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
0.05
NSD (all pT)
Tune Z1
CMS
NSD (all pT)
_
CMS Data
PYTHIA Tune Z1C
Charged Particle Ratio
7 TeV
900 GeV
Tune Z1C
0.00
0
1
2
3
4
-4
-3
-2
-1
0
1
2
3
4
Rapidity Y
Rapidity Y
CMS NSD data on the
CMS NSD data on the
Lambda+AntiLambda rapidity distribution
Lambda+AntiLambda rapidity distribution
at 7 TeV and 900 GeV compared with
at 7 TeV and 900 GeV compared with
PYTHIA Tune Z1. The plot shows the
PYTHIA Tune Z1. The plot shows the
average number of particles per NSD
average number of particles per NSD
collision per unit Y, (1/NNSD) dN/dY.“Minimum Bias” Collisions
collision per unit Y, (1/NNSD) dN/dY.
Proton more Lambda’s in PYTHIA
Not bad! Many
Tune Z1C!
Proton
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 26
Lambda Production
(Lam+LamBar) Rapidity Distribution: dN/dY
(Lam+LamBar) Rapidity Distribution:
dN/dYDistribution Ratio: (Lam+LamBar)/(2Kshort)
Rapidity
0.25
0.5
CMS Data
PYTHIA Tune Z1
0.10
0.05
0.00
-3
-2
-1
0.3
0.2
900 GeV
0.1
Rapidity Y
1-4
2-3
0.20
0.15
7 TeV
CMS
7 TeV
(Λ
Λ+Λ
Λ)
Z1C
0.10
Tune Z1C
qq/q: 0.1 -> 0.12
Z1
us/s: 0.4 -> 0.8
900 GeV
Tune Z1C
0.00
0.0
0
(Λ
Λ+Λ
Λ)/(2Kshort)
Tune0.05
Z1C
qq/q: 0.1 -> 0.12NSD (all pT)
us/s: 0.4 -> 0.8
TuneNSDZ1
(all pT)
CMS
NSD (all pT)
Charged Particle Ratio
dN/dY Particle Ratio
dN/dY
0.15
0.4
_
_
CMS Data
PYTHIA Tune Z1C
PYTHIA Tune Z1 & Z1C
0.20
-4
0.25
_
CMS Data
7 TeV
(Λ
Λ+Λ
Λ)
3-2
4-1
0 -4
1 -3
Rapidity Y
2 -2
3 -1
4 0
1
2
3
4
Rapidity Y
CMS NSD data on the
CMS NSD data on the
Lambda+AntiLambda rapidity distribution
Lambda+AntiLambda rapidity distribution
at 7 TeV and 900 GeV compared with
at 7 TeV and 900 GeV compared with
PYTHIA Tune Z1. The plot shows the
PYTHIA Tune Z1. The plot shows the
average number of particles per NSD
average number of particles per NSD
collision per unit Y, (1/NNSD) dN/dY.“Minimum Bias” Collisions
collision per unit Y, (1/NNSD) dN/dY.
Proton more Lambda’s in PYTHIA
Not bad! Many
Tune Z1C!
Proton
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 27
Cascade Production
(Cas+CasBar) Rapidity Distribution: dN/dY
(Cas+CasBar) Rapidity Distribution: dN/dY
0.03
CMS Data
−
0.03
_
Charged Particle Ratio
(Ξ
Ξ +Ξ
Ξ )
PYTHIA Tune Z1
7 TeV
dN/dY
0.02
CMS
900 GeV
0.01
PYTHIA Tune Z1C
_
−
7 TeV
CMS
0.02
0.01
Tune Z1
NSD (all pT)
−
(Ξ
Ξ −+Ξ
Ξ −)
CMS Data
−
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
NSD (all pT)
900 GeV
Tune Z1C
0.00
0.00
-4
-3
-2
-1
0
1
2
3
4
-4
-3
-2
-1
0
1
2
3
4
Rapidity Y
Rapidity Y
CMS NSD data on the Cascade CMS NSD data on the Cascade-+AntiCascade+AntiCascade- rapidity distribution at 7 TeV
rapidity distribution at 7 TeV and 900 GeV
and 900 GeV compared with PYTHIA Tune
compared with PYTHIA Tune Z1. The plot
Z1. The plot shows the average number of
shows the average number of particles per
particles per NSD collision per unit Y,
NSD collision per unit Y, (1/NNSD) dN/dY.
(1/NNSD) dN/dY.
“Minimum Bias” Collisions
Wow!Proton
PYTHIA Tune Z1C looks veryProton
nice here!
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 28
Cascade Production
(Cas+CasBar) Rapidity Distribution: dN/dY
(Cas+CasBar) Rapidity Distribution:
dN/dYDistribution Ratio: (Cas+CasBar)/(2Kshort)
Rapidity
0.03
0.05
CMS Data
−
CMS Data
CMS
0.01
0.04
PYTHIA Tune Z1 & Z1C
Charged Particle Ratio
dN/dY Particle Ratio
dN/dY
0.02
7 TeV
0.03
0.02
900 GeV
0.00
-2
-1
0
0.00
1 -4
Rapidity Y
PYTHIA Tune Z1C
0.02
−
_
−
CMS
7 TeV
_
−
(Ξ
Ξ −+Ξ
Ξ −)
−
(Ξ
Ξ −+Ξ
Ξ −)/(2Kshort)
7 TeV
Z1C
0.01
Tune Z1C
qq/q: 0.1 -> 0.12
NSD (all pT)
us/s: 0.4 -> 0.8
0.01
Tune Z1 NSD (all pT)
NSD (all pT)
-3
CMS Data
−
(Ξ
Ξ +Ξ
Ξ )
PYTHIA Tune Z1
-4
0.03
_
Tune Z1C
qq/q: 0.1 -> 0.12
Z1
us/s: 0.4 -> 0.8
900 GeV
Tune Z1C
0.00
2 -3
3 -2
4 -1
0 -4
1 -3
Rapidity Y
2 -2
3 -1
4 0
1
2
3
4
Rapidity Y
CMS NSD data on the Cascade CMS NSD data on the Cascade-+AntiCascade+AntiCascade- rapidity distribution at 7 TeV
rapidity distribution at 7 TeV and 900 GeV
and 900 GeV compared with PYTHIA Tune
compared with PYTHIA Tune Z1. The plot
Z1. The plot shows the average number of
shows the average number of particles per
particles per NSD collision per unit Y,
NSD collision per unit Y, (1/NNSD) dN/dY.
(1/NNSD) dN/dY.
“Minimum Bias” Collisions
Wow!Proton
PYTHIA Tune Z1C looks veryProton
nice here!
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 29
Cascade Production
(Cas+CasBar) Rapidity Distribution: dN/dY
(Cas+CasBar) Rapidity Distribution:
dN/dY
Rapidity
Ratio: (Cas+CasBar)/(Lam+LamBar)
Rapidity
Distribution
Ratio: (Cas+CasBar)/(2Kshort)
0.05
0.20
CMS Data
dN/dY
dN/dY Particle
Particle Ratio
Ratio
PYTHIA Tune Z1
dN/dY
0.02
CMS
0.01
0.00
-3
-2
-1
0
CMS Data
PYTHIA
Tune
Z1C
PYTHIA
Tune
Z1Z1
&&
Z1C
7 TeV
0.03
0.10
0.02
900 GeV
0.05
0.01
0.00
1 -4
Rapidity Y
−
__−
_
−
0.02
CMS
7 TeV
7 TeV
_
−
(Ξ
Ξ −+Ξ
Ξ −)
−Ξ −+Ξ
− −)/(2K
Ξ(Ξ
+Ξ
Ξ Ξ)/(Λ
Λ+Λ
Λ)short)
PYTHIA Tune Z1C(Ξ
7 TeV
Z1C
Z1C
0.01
Z1
Tune
Z1C
Tune
Z1C
qq/q:
0.12
qq/q:
0.10.1
-> ->
0.12
NSD (all pT)
us/s:
us/s:
0.40.4
->->
0.80.8
Tune Z1 NSD (all pT)
NSD (all pT)
-4
0.04
0.15
0.03
_
−
−
CMS
Data
CMS
Data
(Ξ
Ξ +Ξ
Ξ )
Charged Particle Ratio
0.03
Tune Z1C
qq/q: 0.1 -> 0.12
Z1
us/s: 0.4 -> 0.8
900 GeV
Tune Z1C
0.00
2 -3
3 -2
4 -1
0 -4
1 -3
Rapidity Y
2 -2
3 -1
4 0
1
2
3
4
Rapidity Y
CMS NSD data on the Cascade CMS NSD data on the Cascade-+AntiCascade+AntiCascade- rapidity distribution at 7 TeV
rapidity distribution at 7 TeV and 900 GeV
and 900 GeV compared with PYTHIA Tune
compared with PYTHIA Tune Z1. The plot
Z1. The plot shows the average number of
shows the average number of particles per
particles per NSD collision per unit Y,
NSD collision per unit Y, (1/NNSD) dN/dY.
(1/NNSD) dN/dY.
“Minimum Bias” Collisions
Wow!Proton
PYTHIA Tune Z1C looks veryProton
nice here!
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 30
Transverse Momentum
Distributions
PT Distribution: Kshort
PT Distribution: Lam+LamBar
1.0E+01
1.0E+00
CMS Data
CMS Data
PYTHIA Tune Z1 & Z1C
1.0E+00
1.0E-01
1.0E-02
Z1C
1.0E-03
1.0E-04
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
NSD (|Y| < 2))
1.0E-02
_
(Λ
Λ+Λ
Λ)
Z1C
Z1
1.0E-03
1.0E-04
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
NSD (|Y| < 2))
Z1
1.0E-05
7 TeV
PYTHIA Tune Z1 & Z1C
1.0E-01
dN/dPT (GeV/c)
dN/dPT (1/GeV/c)
7 TeV
1.0E-05
0
1
2
3
4
5
6
7
8
9
10
0
1
PT (GeV/c)
2
3
4
5
6
7
8
9
10
PT (GeV/c)
CMS NSD data on the
Lambda+AntiLambda transverse
momentum distribution at 7 TeV compared
with PYTHIA Tune Z1 & Z1C. The plot
shows the average number of particles per
NSD collision per unit pT, (1/NNSD) dN/dpT
for |Y| < 2.
“Minimum Bias” Collisions
CMS NSD data on the Kshort transverse
momentum distribution at 7 TeV
compared with PYTHIA Tune Z1 & Z1C.
The plot shows the average number of
particles per NSD collision per unit pT,
(1/NNSD) dN/dpT for |Y| < 2.
Proton
PYTHIA Tune
Z1 & Z1C are a bit off on the
pT dependence!
Proton
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 31
Transverse Momentum
Distributions
Cas+CasBar PT Distribution: dN/dPT
PT Distribution: Cas+CasBar
1.0E+00
1.0E-01
CMS Data
PYTHIA Tune Z1 & Z1C
−
(Ξ
Ξ +Ξ
Ξ )
Z1
1.0E-03
NSD (|Y| < 2))
_
Ξ −+Ξ
Ξ −)
(Ξ
−
Z1C
1.0E-02
7 TeV
PYTHIA Tune Z1 & Z1C
_
Probability
dN/dPT (1/GeV/c)
CMS Data
7 TeV
Z1C
1.0E-01
Z1
1.0E-02
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
NSD (|Y| < 2))
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
Normalized to 1
1.0E-03
1.0E-04
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
PT (GeV/c)
PT (GeV/c)
CMS NSD data on the Cascade CMS NSD data on the Cascade+AntiCascade- transverse momentum
+AntiCascade- transverse momentum
distribution at 7 TeV compared with
distribution at 7 TeV (normalized to 1)
PYTHIA Tune Z1 & Z1C. The plot shows
compared with PYTHIA Tune Z1 & Z1C.
the average number of particles per NSD
collision per unit pT, (1/NNSD) dN/dpT for |Y|
“Minimum Bias” Collisions
< 2.
Proton
Proton
PYTHIA Tune
Z1 & Z1C are a bit off on the
pT dependence!
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 32
7
Particle Ratios versus PT
PT Particle Ratio: (Lam+LamBar)/(2Kshort)
0.8
Particle Ratio: (Lam+LamBar)/(2Kshort)
0.8
_
CMS Data
_
(Λ
Λ+Λ
Λ)/(2Kshort)
PYTHIA Tune Z1 & Z1C
Λ+Λ
Λ)/(2Kshort)
(Λ
ALICE Data
0.6
Z1C
Z1C
Ratio
PT Particle Ratio
PYTHIA Tune Z1 & Z1C
0.6
0.4
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
0.2
Z1
NSD (|Y| < 2)
0.4
0.2
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
900 GeV
7 TeV
INEL (|Y| < 0.75)
0.0
Z1
0.0
0
1
2
3
4
5
6
7
8
9
10
0
PT (GeV/c)
1
2
3
4
5
6
PT (GeV/c)
CMS NSD data on the Lambda+AntiLambda ALICE INEL data on the Lambda+AntiLambda
to 2Kshort ratio versus pT at 7 TeV (|Y| < 2)
to 2Kshort ratio versus pT at 900 GeV (|Y| < 0.75)
compared with PYTHIA Tune Z1 & Z1C.
compared with PYTHIA Tune Z1 & Z1C.
Single-strange Baryon
(Λ
Λ + Λ)
=
2Kshort
Strange Meson
Single-strange Baryon
(Λ
Λ + Λ)
=
2Kshort
Strange Meson
“Minimum Bias” Collisions
Tune Z1C Proton
is not too bad but a bit off on the
pT dependence!
Proton
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 33
Particle Ratios versus PT
PT Particle Ratio: (Cas+CasBar)/(Lam+LamBar)
PT Particle Ratio: (Cas+CasBar)/(2Kshort)
0.15
CMS Data
−
−
(Ξ
Ξ +Ξ
Ξ )/(2Kshort)
0.10
0.25
PT Particle Ratio
PYTHIA Tune Z1 & Z1C
PT Particle Ratio
_
0.30
Z1C
0.05
NSD (|Y| < 2)
0.00
0
1
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
7 TeV
2
3
4
CMS Data
−
_
_
−
(Ξ
Ξ −+Ξ
Ξ −)/(Λ
Λ+Λ
Λ)
PYTHIA Tune Z1 & Z1C
Z1C
0.20
0.15
0.10
Z1
NSD (|Y| < 2)
Z1
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
0.05
7 TeV
0.00
5
6
7
8
0
1
2
3
4
5
6
7
PT (GeV/c)
PT (GeV/c)
CMS NSD data on the Cascade+AntiCascade- to 2Kshort ratio versus pT at 7
TeV (|Y| < 2) compared with PYTHIA Tune
Z1 (Ξ
&
Double-strange Baryon
Ξ Z1C.
+ Ξ)
=
2Kshort
Strange Meson
CMS NSD data on the Cascade-+AntiCascadeto Lambda+AntiLambda ratio versus pT at 7
TeV (|Y| < 2) compared with PYTHIA Tune
Z1 & Z1C.
Double-strange Baryon
(Ξ
Ξ + Ξ)
=
Single-strange Baryon
(Λ
Λ + Λ)
“Minimum Bias” Collisions
Proton
Tune Z1C
is not too bad but a bit off onProton
the pT dependence!
LPCC MB&UE Meeting
CERN June 17, 2011
8
Rick Field – Florida/CDF/CMS
Page 34
Particle Ratios versus PT
PT Particle Ratio: Kaons/Pions
Rapidity Distribution Ratio: Kaons/Pions
0.60
0.3
ALICE Data
(K +K )/(π
π +π
π)
+
+
-
ALICE Data
(K++K-)/(π
π++π
π-)
PYTHIA Tune Z1 & Z1C
0.40
dN/dY Particle Ratio
PT Particle Ratio
PYTHIA Tune Z1 & Z1C
-
Z1C
Z1
0.20
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
900 GeV
INEL (|Y| < 0.75)
0.2
Z1C
0.1
900 GeV
INEL (all pT)
0.00
Z1
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
0.0
0
1
2
PT (GeV/c)
3
4
-4
-3
Tails of the pT distribution.
Way off due to the wrong pT!
ALICE INEL data on the charged kaons to
charged pions ratio versus pT at 900 GeV (|Y|
< 0.75) compared with PYTHIA Tune Z1 &
Z1C.(K++ K-)
Strange Meson
=
(π
π++ π-)
Non-strange Meson
-2
-1
0
1
2
3
Rapidity Y
ALICE INEL data on the charged kaon to
charged pion rapidity ratio at 900 GeV
compared with PYTHIA Tune Z1.
“Minimum Bias” Collisions
Tune Z1C isProton
not too bad but a way off on the
pT dependence!
Proton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Rick Field – Florida/CDF/CMS
Page 35
Particle Ratios versus PT
PT Particle Ratio: (P+Pbar)/Pions
Rapidity Distribution Ratio: (P+Pbar)/Pions
0.4
PYTHIA Tune Z1 & Z1C
_
(p+p)/(π
π++π
π-)
ALICE Data
PYTHIA Tune Z1 & Z1C
dN/dY Particle Ratio
PT Particle Ratio
0.12
_
π++π
π-)
(p+p)/(π
ALICE Data
0.3
Z1C
0.2
Z1
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
0.1
900 GeV
INEL (|Y| < 0.75)
Z1C
0.09
0.06
Z1
0.03
900 GeV
INEL (all pT)
0.0
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
0.00
0
1
2
3
4
-4
-3
PT (GeV/c)
-2
-1
0
1
2
3
Rapidity Y
ALICE INEL data on the Proton+AntiProton
to charged pions ratio versus pT at 900 GeV
(|Y| < 0.75) compared with PYTHIA Tune Z1
& Z1C.
Non-strange Baryon
(p + p)
=
(π
π++ π-)
Non-strange Meson
ALICE INEL data on the
Proton+AntiProton to charged pion rapidity
ratio at 900 GeV compared with PYTHIA
Tune Z1 & Z1C.
“Minimum Bias” Collisions
Tune Z1CProton
is not too bad but way off on the
pT dependence!
Proton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Rick Field – Florida/CDF/CMS
Page 36
Particle Ratios versus PT
PT Particle Ratio: (P+Pbar)/Pions
Rapidity Distribution Ratio: (P+Pbar)/Pions
0.4
PYTHIA Tune Z1 & Z1C
_
(p+p)/(π
π++π
π-)
ALICE Data
PYTHIA Tune Z1 & Z1C
dN/dY Particle Ratio
PT Particle Ratio
0.12
_
π++π
π-)
(p+p)/(π
ALICE Data
0.3
Z1C
0.2
Z1
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
0.1
900 GeV
INEL (|Y| < 0.75)
Z1C
0.09
0.06
Z1
0.03
900 GeV
INEL (all pT)
0.0
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
0.00
0
1
2
PT (GeV/c)
3
4
-4
-3
Tails of the pT distribution.
Way off due to the wrong pT!
ALICE INEL data on the Proton+AntiProton
to charged pions ratio versus pT at 900 GeV
(|Y| < 0.75) compared with PYTHIA Tune Z1
& Z1C.
Non-strange Baryon
(p + p)
=
(π
π++ π-)
Non-strange Meson
-2
-1
0
1
2
3
Rapidity Y
ALICE INEL data on the
Proton+AntiProton to charged pion rapidity
ratio at 900 GeV compared with PYTHIA
Tune Z1 & Z1C.
“Minimum Bias” Collisions
Tune Z1CProton
is not too bad but way off on the
pT dependence!
Proton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Rick Field – Florida/CDF/CMS
Page 37
Particle Ratios versus PT
PT Particle Ratio: (P+Pbar)/Pions
Rapidity Distribution Ratio: (P+Pbar)/Pions
Rapidity Distribution Ratio: (P+Pbar)/Pions
0.12
ALICE Data
ALICE Data
0.3
0.2
0.1
Z1C
0.09
0.06
Z1
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
900 GeV
INEL (|Y| < 0.75)
0.0
0
1
_
PYTHIA Tune Z1 & Z1C
π++π
π-)
(p+p)/(π
0.09
Z1
0.00
-4
-3
3
900 GeV
4
Tune Z1C
qq/q: 0.1 -> 0.12
us/s: 0.4 -> 0.8
0.03
0.00
INEL (all pT)
PT (GeV/c)
Z1C
0.06
900 GeV
INEL (all pT)
0.03
2
_
(p+p)/(π
π++π
π-)
ALICE Data
PYTHIA Tune Z1 & S350
dN/dY Particle Ratio
PT Particle Ratio
PYTHIA Tune Z1 & Z1C
0.12
_
π++π
π-)
(p+p)/(π
dN/dY Particle Ratio
0.4
-4
-3
Tails of the pT distribution.
Way
pT! 1
-2 off due-1to the wrong
0
pyZ1 = solid
-2
-1
pyS350 = dashed
0
1
2
3
4
Rapidity Y
2
3
4
ALICE INEL data on the Proton+AntiProton ALICE INEL data on the
Rapidity Y
to charged pions ratio versus pT at 900 GeV
Proton+AntiProton to charged pion rapidity
(|Y| < 0.75) compared with PYTHIA Tune Z1
ratio at 900 GeV compared with PYTHIA
& Z1C.
Non-strange Baryon
Tune Z1 & Z1C.
(p + p)
=
(π
π++ π-)
Non-strange Meson
“Minimum Bias” Collisions
Tune Z1CProton
is not too bad but way off on the
pT dependence!
Proton
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 38
1/σ dσ/dxp
LEP: Proton Spectrum
91 GeV ee
Z (hadronic)
2
10
p spectrum (particle-level)
ALEPH
Pythia 6Perugia
(350:P2011)
S350
2011
10
Pythia 6 (340:AMBT1)
Pythia 6 (327:P2010)
Pythia 6 (129:Pro-Q2O)
Pythia 6 (343:Z2)
1
mcplots.cern.ch
10-1
10-2
ALEPH_1996_S3486095
Pythia 6.425
0
0.2
0.4
0.6
0.8
xp
Ratio
to ALEPH
Theory/Data
1.5
1
0.5
LPCC MB&UE Meeting
CERN June 17, 2011
0
Rick Field – Florida/CDF/CMS
0.2
0.4
0.6
0.8
Page 39
MB versus UE
Charged Particle Density: dN/dη
ηdφ
φ
ηdφ
φ
Transverse Charged Particle Density: dN/dη
2.5
RDF Preliminary
CMS Data
PYTHIA Tune Z1
PYTHIA Tune Z1
Charged Particle Density
Charged Particle Density
2.5
2.0
Factor of 2!
1.5
1.0
Charged Particles (|η
η| < 2, all pT)
0.5
Tune Z1
CMS
2.0
Tune Z1
1.0
0.5
7 TeV ND
pyZ1 ND = dashed
7 TeV
NSD (all pT)
0.0
NSD = ND + DD
1.5
pyZ1 NSD = solid
0.0
0
5
10
15
20
25
-4
-3
-2
-1
0
1
2
3
Pseudo-Rapidity η
PT max (GeV/c)
Shows the density of charged particles in
the “transverse” region as a function of
PTmax for charged particles (All pT, |η
η| <
2) at 7 TeV from PYTHIA Tune Z1.
Outgoing Parton
CMS NSD data on the charged particle rapidity
distribution at 7 TeV compared with PYTHIA
Tune Z1. The plot shows the average number of
charged particles per NSD collision per unit η−φ,
(1/NNSD) dN/dη
ηdφ
φ.
PT(hard)
“Minimum Bias” Collisions
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Proton
Underlying Event
Proton
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 40
UE Particle Type
Log Scale!
ηdφ
φ
Transverse Charged Particle Density: dN/dη
Transverse Particle Density: dN/dη
ηdφ
φ
2.5
10.000
RDF Preliminary
PYTHIA Tune Z1
PYTHIA Tune Z1
2.0
Particle Density
Charged Particle Density
RDF Preliminary
1.5
1.0
Charged Particles (|η
η| < 2, all pT)
7 TeV ND
charged particles
(π
π++π
π-)
1.000
(K++K-)
_
(p+p
)
_
0.100
Λ+Λ
Λ)
(Λ
0.010
−
Tune Z1
7 TeV ND
0
5
10
15
20
25
0
5
10
Shows the density of charged particles in
the “transverse” region as a function of
PTmax for charged particles (All pT, |η
η| <
2) at 7 TeV from PYTHIA Tune Z1.
PT(hard)
Initial-State Radiation
Initial-State Radiation
Proton
LPCC MB&UE Meeting
CERN June 17, 2011
25
Outgoing Parton
PT(hard)
Outgoing Parton
20
Shows the density of particles in the
“transverse” region as a function of
PTmax for charged particles (All pT, |η
η| <
2) at 7 TeV from PYTHIA Tune Z1.
Outgoing Parton
Underlying Event
15
PTmax (GeV/c)
PT max (GeV/c)
Proton
−
(|η
η| < 2, all pT)
0.001
0.0
_
Ξ −+Ξ
Ξ −)
(Ξ
0.5
Underlying Event
Proton
Proton
Underlying Event
Final-State
Radiation
Outgoing Parton
Rick Field – Florida/CDF/CMS
Underlying Event
Final-State
Radiation
Page 41
MB versus UE
"Transverse" Particle Density: dN/dη
ηdφ
φ
ηdφ
φ
Charged Particle Density: dN/dη
0.15
0.15
RDF Preliminary
Charged Particle Density
PYTHIA Tune Z1
Particle Density
RDF Preliminary
Kshort
0.10
Factor of ~2!
0.05
Kshort (|η
η| < 2, all pT)
Tune Z1
Kshort
PYTHIA Tune Z1
0.10
0.05
Kshort (all pT)
Tune Z1
7 TeV ND
7 TeV ND
0.00
0.00
0
5
10
15
20
25
-4
-3
-2
-1
0
1
2
3
Pseudo-Rapidity η
PT max (GeV/c)
Shows the density of Kshort particles in the
“transverse” region as a function of
PTmax for charged particles (All pT, |η
η| <
2) at 7 TeV from PYTHIA Tune Z1.
Shows the Kshort pseudo-rapidity distribution (all
pT) at 7 TeV from PYTHIA Tune Z1. The plot
shows the average number of particles per ND
collision per unit η−φ, (1/NND) dN/dη
ηdφ
φ.
Outgoing Parton
PT(hard)
“Minimum Bias” Collisions
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Proton
Underlying Event
Proton
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 42
MB versus UE
Charged Particle Density: dN/dη
ηdφ
φ
"Transverse" Particle Density: dN/dη
ηdφ
φ
0.12
0.12
_
(p+p)
RDF Preliminary
RDF Preliminary
Charged Particle Density
Particle Density
PYTHIA Tune Z1
0.08
Factor of ~2!
0.04
Tune Z1
_
PYTHIA Tune Z1
(p+p)
0.08
0.04
7 TeV ND (all pT)
Tune Z1
7 TeV ND (|η
η| < 2,all pT)
0.00
0.00
0
5
10
15
20
25
-4
-3
-2
-1
0
1
2
3
Pseudo-Rapidity η
PT max (GeV/c)
Shows the density of P+antiP particles in
the “transverse” region as a function of
PTmax for charged particles (All pT, |η
η| <
2) at 7 TeV from PYTHIA Tune Z1.
Shows the P+antiP pseudo-rapidity distribution
(all pT) at 7 TeV from PYTHIA Tune Z1. The
plot shows the average number of particles per
ND collision per unit η−φ, (1/NND) dN/dη
ηdφ
φ.
Outgoing Parton
PT(hard)
“Minimum Bias” Collisions
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Proton
Underlying Event
Proton
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 43
MB versus UE
Charged Particle Density: dN/dη
ηdφ
φ
"Transverse" Particle Density: dN/dη
ηdφ
φ
Charged Particle Density: dN/dη
ηdφ
φ
0.12
0.04
Tune Z1
0.00
0
5
Charged Particle Density
0.08
RDF Preliminary
RDF Preliminary
Charged Particle Density
Particle Density
PYTHIA Tune Z1
0.12
_
(p+p)
0.12
RDF Preliminary
PYTHIA Tune Z1
0.08
Factor
0.04
of ~2!
_
0.08
0.04
20
25
7 TeV ND (all pT)
Tune Z1
7 TeV ND (|η
η| < 2,all pT)
15
(p+p)
(p+p)
0.00
10
_
PYTHIA Tune Z1
-37
-4
TeV ND
pT)
-2 (all -1
0
1
2
3
Pseudo-Rapidity η
PT max (GeV/c)
0.00
-10
-8particles
-6
-4
Shows the density of P+antiP
in
the “transverse” region as a function of
PTmax for charged particles (All pT, |η
η| <
2) at 7 TeV from PYTHIA Tune Z1.
-2
2
6
8
10
0Shows
the4P+antiP
pseudo-rapidity
distribution
Pseudo-Rapidity
(all pTη) at 7 TeV from PYTHIA Tune Z1. The
plot shows the average number of particles per
ND collision per unit η−φ, (1/NND) dN/dη
ηdφ
φ.
Outgoing Parton
PT(hard)
“Minimum Bias” Collisions
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Proton
Underlying Event
Proton
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 44
MB versus UE
"Transverse" Particle Density: dN/dη
ηdφ
φ
_
0.04
(Λ
Λ+Λ
Λ)
RDF Preliminary
PYTHIA Tune Z1
Particle Density
ηdφ
φ
Charged Particle Density: dN/dη
0.03
Factor of ~2!
0.02
0.01
Tune Z1
_
RDF Preliminary
Charged Particle Density
0.04
7 TeV ND (|η
η| < 2,all pT)
(Λ
Λ+Λ
Λ)
PYTHIA Tune Z1
0.03
0.02
0.01
Tune Z1
7 TeV ND (all pT)
0.00
0.00
0
5
10
15
20
25
-4
-3
-2
-1
0
1
2
3
PT max (GeV/c)
Shows the density of Λ+antiΛ
Λ particles in
the “transverse” region as a function of
PTmax for charged particles (All pT, |η
η| <
2) at 7 TeV from PYTHIA Tune Z1.
Shows the Λ+antiΛ
Λ pseudo-rapidity distribution
(all pT) at 7 TeV from PYTHIA Tune Z1. The
plot shows the average number of particles per
ND collision per unit η−φ, (1/NND) dN/dη
ηdφ
φ.
Outgoing Parton
PT(hard)
“Minimum Bias” Collisions
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Pseudo-Rapidity η
Proton
Underlying Event
Proton
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 45
MB versus UE
0.02
0.01
Tune Z1
0.00
0
5
ηdφ
φ
Charged Particle Density: dN/dη
ηdφ
φ
Particle Density: dN/dη
0.04
Charged Particle Density
Particle Density
0.03
Charged Particle Density
"Transverse" Particle Density: dN/dη
ηdφ
φ
Charged
_
RDF Preliminary
0.04
(Λ
Λ+Λ
Λ)
PYTHIA Tune Z1
RDF Preliminary
0.04
PYTHIA Tune Z1
0.03
Factor of ~2!
0.02
0.01
10
7 TeV ND (|η
η| < 2,all pT)
_
RDF Preliminary
_
PYTHIA Tune Z1
(Λ
Λ+Λ
Λ)
(Λ
Λ+Λ
Λ)
0.03
0.02
0.01
Tune Z1
7 TeV ND (all pT)
0.00
15
20
25
-4
-37
TeV -2
ND (all -1pT)
0
1
2
3
PT max (GeV/c)
0.00
-10 Λ-8particles
-6
-4
Shows the density of Λ+antiΛ
in
the “transverse” region as a function of
PTmax for charged particles (All pT, |η
η| <
2) at 7 TeV from PYTHIA Tune Z1.
6 Λ pseudo-rapidity
8
10
the 4Λ+antiΛ
distribution
Pseudo-Rapidity
(all pT)η at 7 TeV from PYTHIA Tune Z1. The
plot shows the average number of particles per
ND collision per unit η−φ, (1/NND) dN/dη
ηdφ
φ.
-2 0Shows
2
Outgoing Parton
PT(hard)
“Minimum Bias” Collisions
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Pseudo-Rapidity η
Proton
Underlying Event
Proton
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 46
MB versus UE
"Transverse" Particle Density: dN/dη
ηdφ
φ
_
0.04
(Λ
Λ+Λ
Λ)
RDF Preliminary
PYTHIA Tune Z1
Particle Density
ηdφ
φ
Charged Particle Density: dN/dη
0.03
Factor of ~2!
0.02
0.01
Tune Z1
_
RDF Preliminary
Charged Particle Density
0.04
7 TeV ND (|η
η| < 2,all pT)
(Λ
Λ+Λ
Λ)
PYTHIA Tune Z1
0.03
0.02
0.01
Tune Z1
7 TeV ND (all pT)
0.00
0.00
0
5
10
15
20
25
-4
-3
-2
-1
0
1
2
3
PT max (GeV/c)
Shows the density of Λ+antiΛ
Λ particles in
the “transverse” region as a function of
PTmax for charged particles (All pT, |η
η| <
2) at 7 TeV from PYTHIA Tune Z1.
Shows the Λ+antiΛ
Λ pseudo-rapidity distribution
(all pT) at 7 TeV from PYTHIA Tune Z1. The
plot shows the average number of particles per
ND collision per unit η−φ, (1/NND) dN/dη
ηdφ
φ.
Outgoing Parton
PT(hard)
“Minimum Bias” Collisions
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Pseudo-Rapidity η
Proton
Underlying Event
Proton
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 47
MB versus UE
"Transverse" Particle Density: dN/dη
ηdφ
φ
_
RDF Preliminary
Particle Density
PYTHIA Tune Z1
RDF Preliminary
Factor of ~2!
0.02
Tune Z1
0.00
0
5
0.04
(Λ
Λ+Λ
Λ)
0.03
0.01
ηdφ
φ
Charged Particle Density: dN/dη
Charged Particle Density
0.04
PYTHIA Tune Z1
0.03
0.02
0.01
Coming soon! Measurements
from
CMS,
Tune Z1
7 TeV ND (|η
η| < 2,all pT)
ATLAS, and ALICE
0.00on the strange
-4
-1
0
1
10
15
20
25
particles
and
baryons
in-3 the-2
η
Pseudo-Rapidity
PT max (GeV/c)
“underlying event”.
Shows the density of Λ+antiΛ
Λ particles in
the “transverse” region as a function of
PTmax for charged particles (All pT, |η
η| <
2) at 7 TeV from PYTHIA Tune Z1.
_
(Λ
Λ+Λ
Λ)
7 TeV ND (all pT)
2
3
Shows the Λ+antiΛ
Λ pseudo-rapidity distribution
(all pT) at 7 TeV from PYTHIA Tune Z1. The
plot shows the average number of particles per
ND collision per unit η−φ, (1/NND) dN/dη
ηdφ
φ.
Outgoing Parton
PT(hard)
“Minimum Bias” Collisions
Initial-State Radiation
Proton
Proton
Underlying Event
Outgoing Parton
LPCC MB&UE Meeting
CERN June 17, 2011
4
Proton
Underlying Event
Proton
Final-State
Radiation
Rick Field – Florida/CDF/CMS
Page 48
Fragmentation Summary
Not too hard to get the overall yields of
baryons and strange particles roughly
right at 900 GeV and 7 TeV. Tune Z1C
does a fairly good job with the overall
particle yields at 900 GeV and 7 TeV.
K+
Kshort
Λ
u s
d s +d s
ud s
K-
p
Ξ−
u s
uud
dss
PT Distributions: PYTHIA does not describe correctly the pT distributions
of heavy particles (MC softer than the data). None of the fragmentation
parameters I have looked at changes the pT distributions. Hence, if one
looks at particle ratios at large pT you can see big discrepancies between
data and MC (out in the tails of the distributions)!“Minimum Bias” Collisions
ATLAS Tuning Effort: Fragmentation Proton
Proton
flavor tuning at the one of the four
stages.
Other Fragmentation Tuning: There is additional tuning involving jet
shapes, FSR, and ISR that I did not have time to include in this talk.
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 49
Fragmentation Summary
+
K
Kshort
Not too hard to get the overall yields of
u s
d s +d s
baryons and strange particles roughly
right at 900 GeV and 7 TeV. Tune Z1C
p
Kdoes a fairly good job with the overall
uud
u s
particle yields at 900Warning!
GeV andThe
7 TeV.
Tune Z1C fragmentation
Λ
ud s
Ξ−
dss
parameters may cause problems
does not
describe
the pT distributions
PT Distributions: PYTHIAfitting
the LEP
data. correctly
If so
of heavy particles (MC softer
than understand
the data). why!
None of the fragmentation
we must
parameters I have lookedWe
at changes
theone
pT tune
distributions.
Hence, if one
do not want
for
e+e- p
and
another
onebig
for discrepancies between
looks at particle ratios at large
can see
T you
hadron-hadron
collisions!
data and MC (out in the tails
of the distributions)!
“Minimum Bias” Collisions
ATLAS Tuning Effort: Fragmentation Proton
Proton
flavor tuning at the one of the four
stages.
Other Fragmentation Tuning: There is additional tuning involving jet
shapes, FSR, and ISR that I did not have time to include in this talk.
LPCC MB&UE Meeting
CERN June 17, 2011
Rick Field – Florida/CDF/CMS
Page 50