IWHSS’11 4-6 April 2011 PARIS
IWHSS_11 April 6 2011
A.Magnon
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Monday Morning
 A.Bachetta
 A.Martin
 M.Burkardt
 Z.E.Meziani
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A.Magnon
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A.Bachetta
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A.Bachetta
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A.Magnon
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April 6
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2011
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A.Bachetta
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April 6
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2011
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A.Bachetta
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April 6
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A.Magnon
A.Bachetta
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Transverse Spin and Momentum
Structure of the Nucleon
a large international theoretical and experimental effort
hard polarised pp scattering
RHIC / BNL
 M. Grosse-Perdekamp
'


h
N
X
p
p
h
X
SIDIS off transversely polarised targets:
DESY (HERMES)
CERN (COMPASS)
JLab
 Z.-E. Meziani
and eRHIC, EIC, ENC
and several (future) projects for (polarised) Drell-Yan:
CERN (COMPASS)
FNAL, JParc, RHIC, JINR, IHEP, GSI
 J.-C. Peng, A. Ogawa, A. Ferrero
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A.Martin
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KINEMATICAL REGION
160 GeV
27.5 GeV
JLab 6 GeV
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A.Martin
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Collins asymmetry - proton
h+
π+
same sign and strength:
a very important, not obvious result!
indication for: not a higher twist effect,
weak Q2 dependence of the Collins FF
h-
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π-
A.Martin
COMPASS
sign convention
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Sivers asymmetry - proton
h-
good agreements
π-
h+
• same sign
π+
• COMPASS results in the overlap
region smaller by a factor ~ 2
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A.MartinIWHSS’11
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E06-010 JLAB Experiment to access
the neutron
Spokespeople: X. Jiang (Los Alamos), J.-P. Chen (JLab), H. Gao (Duke), J.C. Peng (UIUC),
Students: Xin Qian (Duke), Chiranjib Dutta (Kentucky), and Kalyan Allada (Kentucky)
Luminosity
Monitor
3He
• Polarized
Target
• Polarized Electron Beam
– ~80% Polarization
– Fast Flipping at 30Hz
– PPM level charge Asymmetry
controlled by online feed back
• BigBite at 30º as Electron Arm
– Pe = 0.7 ~ 2.2 GeV/c
• HRSL at 16º as Hadron Arm
– Ph = 2.35 GeV/c
Beam Polarimetry
(Møller + Compton)
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Z.E.Meziani
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Preliminary Neutron Collin/Sivers Asymmetries
 Systematic uncertainty is still under study
 Curves: Diquark-quark Model (Ma), Global Fit (Anselmino),
Light-Cone quark model (Pasquini)
Collins
Sivers
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Z.E.Meziani
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TMDs program @ 12 GeV in Hall B
PAC approved experiments & LoI
E12-06-112: Pion SIDIS
E12-09-008: Kaon SIDIS
N
q
U
E12-07-107: Pion SIDIS
E12-09-009: Kaon SIDIS
L
LOI12-06-108: Pion SIDIS
LOI12-09-004: Kaon SIDIS
T
 Complete program of TMDs studies for pions and kaons
 Kaon measurements crucial for a better understanding of the
TMDs “kaon puzzle”
 Kaon SIDIS program requires an upgrade of the CLAS12
detector PID RICH detector to replace LTCC
Project under development Courtesy of H. Avakian
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Z.E.Meziani
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M.Burkardt
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M.Burkardt
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M.Burkardt
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Monday Afternoon
 D. De Florian
 Ph. Haegler
 M. Grosse Perdekamp
 C. Franco
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A.Magnon
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D. De Florian
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D. De Florian
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D. De Florian
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Nucleon parton distributions
from lattice QCD
Philipp Hägler
supported by
Typical „measurements“ on the lattice
Not quite as trivial as it might appear...
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Ph. Haegler
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Ju, Jd template figure (update)
[JLab Hall A PRL`07; HERMES JHEP`08]
lattice results from
covariant BChPT extrapolations
[Dorati, Gail, Hemmert NPA 2008]
LHPC arXiv:1001.3620
*
LHPC PRD `08 0705.4295
*
QCDSF (Ohtani et al.) 0710.1534
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QCDSF/UKQCD preliminary
*,1
Goloskokov&Kroll EPJC`09 0809.4126
Wakamatsu 0908.0972
DiFeJaKr EPJC `05 hep-ph/0408173
(Myhrer&)Thomas PRL`08 0803.2775
1Sternbeck,
Pleiter, Zanotti et al. 201
[non-singlet, connected only; add. uncertainties due to chiral extrapolations, renormalizati
*
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Ph. Haegler
Sivers transverse momentum shift
Ph. Hägler, IWHSS, Paris
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Spin Physics Results from RHIC
Preliminaries:
Facility Status
QCD & PDFs vs Data
M. Grosse-Perdekamp UIUC
Gluon spin distribution
Inclusive hadron and jet results
QCD analysis
Low x & x-dependence with di-jets and rapidity separated di-hadrons
W-production in polarized p-p
First results from pp  W  eν
Transverse Spin
Inclusive AN
Channels isolating Collins or Sivers effects
 Drell Yan measurements in Akio Owaga’s talk
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M. Grosse-Perdekamp
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ΔG(x) from DSSV Global QCD Analysis
de Florian, Sassot, Stratmann,
Vogelsang PRD 80:034030,2009
0.2
+0.051
ΔGtrunc[0.05,0.2] = ∫ ΔG(x) dx = 0.005 -0.058
0.05
x ΔG(x)
 ΔGtrunc[0.05,0.2] ≈ 0 since node at x≈0.1
Data constrains only truncated first moment of
ΔG(x) in x-interval [0.05,0.2], but not functional
form at low or high x
ΔGtrunc in large-x region constrained to be
small by requirement that ΔG(x) ≤ G(x); at
Q2=10 GeV2: ΔGtrunc[0.3,1.0] ≤ 0.03
At small x, ΔG(x) can differ from DSSV
beyond errors without violating funda-mental
constraints
Small-x
x≤0.05
RHIC
Range
0.05<x<0.2
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Large-x
x≥0.2
M. Grosse-Perdekamp
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Projected ALL(π0) in MPC for different ΔG(x) at low x
for ∫Ldt = 300 pb-1, √s = 500 GeV (RHIC W program, 2011 to 2015)
Increasing Δgtrunc [10-4,0.05]
ΔGtrunc= -.1
ΔGtrunc= -.2
ΔGtrunc= -.5
pT,1>3 GeV, pT,2 > 1.5 GeV error bars are statistical only
ΔGtrunc [10-4,0.05] = -0.1 will be observable
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M. Grosse-Perdekamp
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Summary
o Gluon Spin contribution constraint for 0.05 < x < 0.2
use di-jet and di-hadron measurements to probe
x-dependence ΔG(x) and forward jet production to
reach low x, x~0.001.
o W-program has started with electrons (STAR & PHENIX)
and muons (PHENIX). Luminosity accumulation will take
3-4 runs.
o Precision data on AN are available. Exciting new Drell Yan
experiment at IP2: AnDY (see Akio Ogawa’s talk).
Initial measurements to isolate Collins -and Siversasymmetries. Much improvement from detector upgrades
and increased statistics.
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C. Franco
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C. Franco
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C. Franco
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Tuesday Morning
 J. Friedrich
 D. Drechsel
 D. Bugg
 G. Bali
 A. Szczepaniak
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J. Friedrich
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J. Friedrich
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J. Friedrich
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J. Friedrich
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D. Drechsel
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D. Drechsel
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D. Drechsel
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Topics in meson spectroscopy for Compass
David Bugg, Queen Mary, London
(i) Look for the I=0 JPC=1-+ partner of p1(1600/1662)
(ii) Measure s(4p)/s(2p) from 1200-2000 MeV for JP=0+,1-,2+.
Sort out f0(1370), f2(1565) and r(1450).
Check if f2(1810) exists or is really f0(1790).
(iii) Check if p1(1405) is resonant or just a threshold cusp.
IWHSS_11 April 6 2011
D. Bugg
Topics in meson spectroscopy for Compass
The p1(1600/1660) looks a good hybrid candidate.
It ought to have an I=0 partner of similar mass.
The only likely decay mode is to a1(1260)p:
JPC = 1++ + 0-+ = 1-+.
This is NOT easy because no angular dependence:
there are only the r and a1 signals to go on, and the
a1 is broad. However, other JPC will have angular
dependence.
There exist possible partners with JPC = 2-+:
h2(1860) and p2(1880); also p(1800), 0-+
IWHSS_11 April 6 2011
D. Bugg
Topics in meson spectroscopy for Compass
CONCLUSION:
There is still lots to do and learn in meson spectroscopy.
I doubt that heavy meson spectroscopy can go beyond narrow
states, but it is important to complete light meson spectroscopy
and baryon spectroscopy and learn what we can about hybrids
and glueballs. Good luck !
The spectroscopy of I=1, C = +1 states and C=-1 states with I=0 and 1
could be completed by measuring polarisation in pp -> 3p0, hhp, hp; wp
and whp0; wh and wp0p0 at the forthcoming Fair facility. It just needs
an extracted p beam of 5 x 104 p/s.
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D. Bugg
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G. Bali
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G. Bali
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A. Szczepaniak
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A. Szczepaniak
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Tuesday Afternoon
 J.C. Peng
 A. Ogawa
 V. Barone
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A.Magnon
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J.C. Peng
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J.C. Peng
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Future Drell-Yan Experiments
at
Akio Ogawa
2011 Apr 5
IWHSS Paris 2011
5
The Relativistic Heavy Ion Collider
IP2
(AnDY, IT)
Au+Au
Polarized p+p
PHENIX
STAR
d+Au
RHIC is a QCD lab
ANDY at IP2
E.C.Aschenauer, A. Bazilevsky, L.C. Bland, K. Drees, C.
Folz, Y. Makdisi, A. Ogawa, P. Pile, T.G. Throwe
Brookhaven National Laboratory
H.J. Crawford, J.M. Engelage, E.G. Judd
“Feasibility Test of Large Rapidity Drell
University of. California, Berkeley/Space Sciences
Yan Production at RHIC”
Laboratory
C.W. Perkins
University of. California, Berkeley/Space Sciences
Letter of Intent submitted 24 May 2010
Laboratory /Stony Brook University
http://www.bnl.gov/npp/docs/pac0610/Crawf A. Derevshchikov, N. Minaev, D. Morozov, L.V. Nogach
Institute for High Energy Physics, Protvino
ord_LoI.100524.v1.pdf
G. Igo, S. Trentalange
PAC presentation:
University of California, Los Angeles
http://www.bnl.gov/npp/docs/pac0610/asche
M. Grosse Perdekamp
nauer_DY-collider_june10.pdf
University of Illinois
M.X. Liu
Los Alamos National Laboratory
H. Avakian
• Timeliness – Run when STAR & PHENIX is
Thomas Jefferson National Accelerator Facility
doing W program (2012-13)
E.J.Brash
Christopher Newport University and TJNAF
• Acceptance/background rejection –
C.F.Perdrisat
Severe space constraints at STAR and
College of William and Mary
PHENIX require major changes in the
V. Punjabi
forward direction to do DY
Norfolk State University
Li, Xuan
• Is charge sign a requirement? – feed
Shandong University, China
back to STAR/PHENIX forward upgrade
Mirko Planinic, Goran Simatovic
plans
University of Zagreb, Croatia
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A. Ogawa
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arXiv:1103.1591 jet AN measurements are
required to clarify signs of quark/gluon
correlators related to Sivers functions.
AN for jets
s=200 GeV
from p+pp
STAR FMS
ECal only “jet-like” event
Positive AN for jet-like events
Lack of cos(γ) dependence
AN for jets will be non-0 ?
“new” Sivers function
“old” Sivers function
ANDY is taking HCal jet trigger right now
(~500M jet trigger events as of last week)
We have ~1/pb as of last week
Need >5x more (possible in 1 week if 3IP collisions
from start of fill)
Determine whether AN(jet) is non-0 is
a requirement for AN(DY) sign-flip measurement58
Letter of Intent: Measurement of Dimuons from Drell-Yan
Process with Polarized Proton Beams and an Internal Target
at RHIC
–
–
–
–
–
–
–
–
–
–
–
–
http://www.bnl.gov/npp/docs/pac0610/Goto_rhic-drell-yan.pdf
Academia Sinica (Taiwan): W.C. Chang
ANL (USA): D.F. Geesaman, P.E. Reimer, J. Rubin
UC Riverside (USA): K.N. Barish
UIUC (USA): M. Groose Perdekamp, J.-C. Peng
KEK (Japan): N. Saito, S. Sawada
LANL (USA): M.L. Brooks, X. Jiang, G.L. Kunde, M.J. Leitch, M.X.
Liu, P.L. McGaughey
RIKEN/RBRC (Japan/USA): Y. Fukao, Y. Goto, I. Nakagawa, K.
Okada, R. Seidl, A. Taketani
Seoul National Univ. (Korea): K. Tanida
Stony Brook Univ. (USA): A. Deshpande
Tokyo Tech. (Japan): K. Nakano, T.-A. Shibata
Yamagata Univ. (Japan): N. Doshita, T. Iwata, K. Kondo, Y.
Miyachi
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A. Ogawa
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V. Barone
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V. Barone
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Fracture Functions
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Wednesday Morning
 A. Ferrero
 E. Leader
 B. Pire
Just Now … !
 A.M
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A.Magnon
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Get Up ….
… for Compass-II
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J.C. Peng
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