CDF Status and Prospects for
Run 2
Tara Shears
Introduction
Accelerator / detector overview:
• Tevatron overview
• CDF overview
• Luminosity
Physics prospects and first results:
• QCD, Heavy flavour, Electroweak, Searches
Conclusions
Tevatron overview
The Tevatron
CDF:
D0:
706
people
650 people
18 countries
12
countries
_
p-p collisions at s = 1.96 TeV
Tevatron operating parameters
Run 1
Run 2
Now
Date
1992 – 1996
2001 - 2009
2003
Integrated
Luminosity
c.m. energy
110 pb-1
4.4 – 8.6 fb-1
240 pb-1
1.8 TeV
1.96 TeV
1.96 TeV
Luminosity
2 x 1031 cm-2 s-1
2 x 1032 cm-1 s-1
5.2 x 1031 cm-2 s-1
Bunch
spacing
3.5 ms
396 – 132 ns
396 ns
CDF
CDF
XFT,SVT triggers
L00
SVX
ISL
Si performance
% silicon ladders integrated
% good silicon ladders
% bad silicon ladders
% average error
> 90%
operational
L00 performance
sd0
pT
L00 improves uniformity of impact parameter res.
SVT Level 2 Trigger
Level 2 hadronic B
trigger
s(d0) ~ 48 mm
15 ms operation
• online primary vertex
finding, tracking
• trigger on displaced
tracks
M(hh)
TOF Performance
TOF resolution within 10 –
20% of design value
(100 ps)
Calibration ongoing
eg. f
S/N = 1942/4517
S/N = 2354/93113
TOF
Luminosity
Integrated luminosity
Total lumi (pb-1)
Run 1 lumi
Mar. 2001
Up to 180 pb-1 will be shown
Sep. 2003
Physics in Run 2
Physics in Run 2
QCD
Jet cross-section,
shapes, multijet events
Heavy flavour
Lifetimes, crosssection, Bc, LB, Bs
studies, CP violation,
xs
Electroweak
Searches
W: mass, width, gauge
couplings
Top: mass, crosssection, branching
ratios
Higgs
SUSY, compositeness,
leptoquarks etc.
# events in
1 fb-1
1014
1011
107
104
QCD
Vital to understand QCD in order to perform precision/search physics
Run 1 inclusive jet cross section
Consistent over 7 orders of magnitude
BUT
deviation at high Et
SM explanation
Run 2 - more high Et jets:
Test QCD at high Et
Discriminate between new physics
and gluon PDF
New bins for
Run 2
Important gluon-gluon and
gluon-quark contributions at high Et
Gluon PDF @ high x not well known.
Dijet mass
Jet 2
ET = 546 GeV (raw)
hdet = -0.30
Jet 1
ET = 583 GeV (raw)
hdet = 0.31
Highest Et jets seen
at the Tevatron!
Had E
Em E
Consistent
with SM
h-f view
CDF Run II Preliminary
M(jj)=1364 GeV/c2
s(B+): Phys Rev
D65 052005
Heavy flavour
production:
Run 1
B
Nason, Cacciari
UPRF-2002-4
Discrepancy from Run 1:
B: s(data)/s(improved
theory) ~ 1.7
CDF Preliminary:s(D*)
C: similar effects seen
Aim: test predictions at Run
2
C
Cacciari: hep-ph/9702389
Charm production:
0
+
*+
+
D ,D ,D ,Ds
Use SVT (5.8 pb-1) to obtain
D0

K-
p+
D*+  D0 p+
Combinatorics
Wrong K-p
D+  K- p+ p+
Ds+  f p+
Determine prompt component
(fit D impact parameter)
Compare s(D) to NLO
D0 i.p.
Charm production:
Nason & Cacciari
hep-ph/0306212
s(D0, pT  5.5 GeV) = 13.3±0.2±1.5µb
s(D*+, pT  6.0GeV) = 5.2±0.1±0.8µb
s(D+, pT  6.0 GeV) = 4.3±0.1±0.7µb
s(Ds, pT  8.0 GeV) = 0.75±0.05±0.22µb
0
+
*+
+
D ,D ,D ,Ds
Heavy flavour
Run 2 improvements:
Better tracking systems
TOF for K-p separation
Displaced track triggers
Increased lumi for rare
decays
Measurements in Run 2:
Production
Bs mass, lifetime, mixing
CP from Bs, B0
B baryon lifetime, mass
Rare decays, Bc study
Tevatron only place to study Bs, b
baryons, Bc
B masses
M(B+) = 5279.32 ± 0.68 ± 0.94 GeV (5279.0 ± 0.5)
M(B0)
= 5280.30 ± 0.92 ± 0.96 GeV (5279.4 ± 0.5)
M(Bs) = 5365.50 ± 1.29 ± 0.94 GeV (5369.7 ± 2.4)
M(LB) = 5620.4 ± 1.6 ± 1.2 GeV
(5624 ± 9)
PDG
Charm: M(Ds
+)-m(D+)
Submitted to PRD!
Cross-check of lattice QCD,
HQET charm mass
Use large SVT triggered
charm sample
m(D+s)-m(D+) = 99.41  0.38  0.21 MeV/c2
PDG 02: 99.2  0.5 MeV/c2
B lifetimes
ct(B+) = 1.63 ± 0.05 ± 0.04 ps
(1.671 ± 0.018)
ct(B0) = 1.51 ± 0.06 ± 0.02 ps (1.537 ± 0.015)
ct(Bs) = 1.33 ± 0.14 ± 0.02 ps
(1.461 ± 0.057)
ct(LB) = 1.25 ± 0.26 ± 0.10 ps (1.229 ± 0.080)
More stats
with SVT
s.l. decays…
Heavy flavour using SVT(+TOF)
Allows exclusive hadronic
decay mode reconstruction:
Bs mixing
s

t
W-
B0
b

Vtb~1

b
W+
t

B0
s
Re(Vts)0.04
e-t/t
Pmix(t) = 0.5*(1-cos(Dm t))
xs = Dm/G (>14.4 ps-1@95%)
Bs oscillation much faster
than Bd because of
coupling to top quark:
Re(Vts)0.040
>Re(Vtd)0.007
•
•
•
•
Use SVT to trigger Bs
Tag charge at production
Tag charge at decay
Measure lifetime
Predicted Dms reach
Current (future)
performance:
– No. events: 1600
(2000) /fb-1
– D2 = 4 (5) %
– st = 67 (50) fs
Improvements:
– More Bs channels
– Better tracking, tagging
Sensitivity:
• Current performance:
– Dms=15 ps-1 / 500 pb-1
(2s)
• Future performance:
– Dms = 18 ps-1 / 1.7 fb-1
– Dms = 24 ps-1 / 3.2 fb-1
– (both 5s)
Bs mixing
•
Dm  DG = f (tH, tL )
– Separate eigenstates and
measure each lifetime
1) BS  DS+ DS- (CP even)
Work continuing in
triggering on these difficult
hadronic modes
(track/vertex/reconstuct)
2) BS  J/y f (CP
even&odd) Different
angular distribution for mm
allow separation of CP even
and odd states
3) BS  J/y h (CP odd)
complementary method
Electroweak physics
Electroweak:W,Z
Measurements in 2fb-1:
Run 2 benefits:
s(W), s(Z)  12 %
s(WW), s(ZZ)  13 - 22%
m(W) measured to 40 MeV
(sys. dominated - theory)
G(W) measured to 30 MeV
couplings measured to ~0.3
W,Z essential calibration signals for high Et
physics
W,Z results
Wmn
Z  ee
Electroweak: top
Run 2 benefits:
s(tt)  40%
More luminosity
Increased b tagging
efficiency + lepton
acceptance
l q q
n q q
l l q
n n q
Measurements in 2 fb-1:
m(top) ~ 1.2% (cf. 2.9%)
s(tt) ~ 10% (cf. 25%)
s(single top) ~ 20% (1st!)
|Vtb| ~ 12% (1st!)
12%
44%
Tevatron only place to study top until LHC startup
44 %
First dilepton tt candidate
Top Results
M(top) (run1) = 176.1 ± 6.6 GeV/c2
M(top) = 177.5 +12.7/-9.4stat  7.1sys GeV/c2
Top mass motivation
Run 2
expected
precision
Electroweak: single top
s(t) ~ 0.9 ±0.1 pb (W*)
s(t) ~ 2.0 ±0.2 pb (Wg)
s(t) |Vtb|2
Tag by 1 high Pt e,m + 2
jets ( 1 b) + Et
Expect 18.5 ± 2.9 events,
see 19
/
st(combined)<17.5pb @95% C.L.
Searches
Production and Decay of Higgs
2 fb-1 data: ~ 2,000 Higgs (200 H+ W,Z)
Backgrounds much larger than at LEP
8.6 fb-1
4.4 fb-1
LEP mH>114.4 GeV @95% CL
Discover at m(H) ~ 115 GeV  Exclude m(H) ~130 GeV
SUSY: stop
stop decays:
~
~
(eg.) t b c1+
~+
c1  l n ~
c0
~
(or) t  b W ~c0
Wln
tag with b jet + lepton
+ Etmiss
Stop results
Long lived stop analysis:
High pt track, large TOF
deposit
Expect 2.9  0.7 ± 3.1
events
See 7 in data
 M(stop) > 107 GeV
SUSY: eeggEt
/
/
eeggEt event in Run 1:
radiative decay of
neutralino to gravitino?
(gravitino lsp)
_
~ ~
pp  ci +cj~0 ~ 0
c 1c 1+X
~~
ggGG+X
Look for more events, +
gg channel in Run 2
Searches: diphoton
Diphoton:
GMSB: radiative decay
to LSP (gravitino)
If neutralino NLSP:
/
ggEt
MC > 113 GeV/c2 @ 95%
C.L.
SUSY: projected limits
Expected
limits for
Run 2:
(taken from Savoy-Navarra, EPS 99)
Conclusions
Conclusions
Run 2 has started at the Tevatron
– New c.m. energy, high luminosity, new detectors
Exciting program of physics ahead
– Tevatron only place where top can be studied
– Possibility of Higgs + new physics
– Many areas of electroweak, heavy flavour and QCD
physics to explore
Run 2 physics underway … watch this space!!