CDF Status and Prospects for Run 2

1
CDF Status and Prospects for Run 2

• Tara Shears

2
Introduction

• Accelerator / detector overview
• Tevatron overview
• CDF overview
• Luminosity
• Physics prospects and first results
• QCD, Heavy flavour, Electroweak, Searches
• Conclusions

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Tevatron overview
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The Tevatron
D0 650 people 18 countries
CDF 706 people 12 countries
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Tevatron operating parameters
Run 1 Run 2 Now
Date 1992 1996 2001 - 2009 2003
Integrated Luminosity 110 pb-1 5.0 9.5 fb-1 160 pb-1
c.m. energy 1.8 TeV 1.96 TeV 1.96 TeV
Luminosity 2 x 1031 cm-2 s-1 2 x 1032 cm-1 s-1 4.8 x 1031 cm-2 s-1
Bunch spacing 3.5 ms 396 132 ns 396 ns
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CDF
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CDF
XFT,SVT triggers
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(No Transcript)
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Silicon system

• 3 separate detectors
• L00 (radius 1.5-2 cm)
• SVX (radius 2.5-10.5cm)
• ISL (radius 2030 cm)
• Covers - 50 cm in z
• 750 000 channels!
• Installed in March 01

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Si performance
silicon ladders integrated
average error
90 good and operational
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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)
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TOF Performance

• TOF resolution within 10 20 of design value
  (100 ps)
• Calibration ongoing

eg. f
S/N 1942/4517
TOF
S/N 2354/93113
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Luminosity
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Integrated luminosity
Total lumi (pb-1)
Run 1 lumi
50-80pb-1 will be shown
May. 2003
Mar. 2001
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Physics in Run 2
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Physics in Run 2
events in 1 fb-1
QCD Jet cross-section, shapes, multijet events
Heavy flavour Lifetimes, cross-section, Bc, LB, Bs studies, CP violation, xs
Electroweak W mass, width, gauge couplings Top mass, cross-section, branching ratios
Searches Higgs SUSY, compositeness, leptoquarks etc.
1014
1011
107
104
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QCD
Vital to understand QCD in order to perform
precision/search physics
Run 1 inclusive jet cross section
Consistent over 7 orders of magnitude
deviation at high Et
BUT
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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 _at_ high x not
well known.
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Dijet mass
Highest Et jets seen at the Tevatron!
Consistent with SM
M(jj)1364 GeV/c2
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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 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
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Heavy flavour using J/y
Inclusive B lifetime Tracking alignment
proof lttbgt1.526 ? 0.034 ? 0.035 ps (CDF) (PDG
02 1.564 ? 0.014 ps)
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Heavy flavour using J/y
LB?J/yL
Exclusive B reconstruction t(Bs)1.26 ? 0.2 ?
0.02 ps (PDG 02 1.46 ? 0.057 ps) m(Bs)5360.3 ?
3.8 2.1-2.9 MeV (PDG 02 5369.6 ? 2.4 MeV)
Bs?J/yf
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Heavy flavour using SVTTOF
Allows exclusive hadronic decay mode
reconstruction
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Bs mixing

• x Dm/G

width
Oscillation freq.

• Currently xs gt 14.6
• Projection for 15 fb-1
• 20 000 Bs decays
• Effective tagging eff. 2 cf. Run 1
• Sensitive to xs lt 63

e-t/t
Pmix(t) 0.5(1-cos(Dm t))
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Bs mixing

• Dm ? DG f (tH, tL )
• Separate eigenstates and measure each lifetime
• BS ? DS DS- (CP even) Work continuing in
  triggering on these difficult hadronic modes
  (track/vertex/reconstuct)
• BS ? J/y f (CP evenodd) Different angular
  distribution for mm allow separation of CP even
  and odd states
• BS ? J/y h (CP odd)

complementary method
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Bs mixing reach
Not much lumi needed for quick limit BUT Need
had. B trigger Need tracking at full spec. Need
tagging understood gt Results summer 2004?
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Charm M(Ds)-m(D)
Submitted to PRD!
Cross-check of lattice QCD, HQET charm mass Use
large SVT triggered charm sample
m(Ds)-m(D) 99.41 ? 0.38 ? 0.21 MeV/c2 PDG 02
99.2 ? 0.5 MeV/c2
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Electroweak physics
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ElectroweakW,Z

• Measurements in 2fb-1
• m(W) measured to 40 MeV (sys. dominated - theory)
• G(W) measured to 30 MeV
• couplings measured to 0.3

• Run 2 benefits
• s(W), s(Z) ? 12
• s(WW), s(ZZ) ? 13 - 22

W,Z essential calibration signals for high Et
physics
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Electroweak W candidates
W-gten
W-gtmn
38628 candidates in 72 pb-1
21599 candidates in 72 pb-1
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Electroweak Z candidates
Z-gtmm
Z-gtee
1631 candidates in 72 pb-1
1830 candidates in 72 pb-1
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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
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!)
n n q
12
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44
Tevatron only place to study top until LHC startup
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First dilepton tt candidate
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Top Results
M(top) (run1) 176.1 6.6 GeV/c2
PRELIMINARY
M(top) 171.2 ? 13.4stat ? 9.9sys GeV/c2
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Top mass motivation
Run 2 expected precision
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Electroweak single top

• s(t) 0.9 pb (W)
• s(t) 2.4 pb (Wg)
• s(t) ?Vtb2
• Tag by 1 high Pt e,m 2 jets ( 1 b) Et
• Signal peak in Wb invariant mass plot

/
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Searches
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Production and Decay of Higgs
2 fb-1 data 2,000 Higgs (200 in
association with W,Z) Backgrounds much larger
than at LEP
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Higgs rates
channel rate mH110 mH120 mH130
lvbb s b 4.8 19 4.4 26 3.7 46
nnbb s b 4.6 36 3.2 39 2.1 30
llbb s b 0.9 3.2 0.6 23 0.4 1.9
qqbb s b 3.5 2800 2.5 2300 1.3 2000
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Expected Luminosity in Run 2
Expected Luminosity in Run 2 (updated)
Discover m(H) 120 GeV, exclude m(H) 190 GeV
Exclude m(H) 130 GeV
Note all numbers under review (new estimates for
summer)
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SUSY stop

• stop decays
• (eg.) t? b c1
• c1 ? l n c0
• (or) t ? b W c0
• W ? l n
• tag with b jet lepton Etmiss

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SUSY trilepton topology

• ?Specific search for decays
• c1 ? c01 l n
• c02 ? c01 l l
• 3 leptons, often enriched in taus

• Study lepton spectra for
• sensitivity to different SUSY
• models
• eg. c1 c02 are produced, c01 is LSP

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SUSY trilepton spectra
Run 2 exclusion limits for 2 models
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SUSY eeggEt
/
/
eeggEt event in Run 1 radiative decay of
neutralino to gravitino? (gravitino lsp) pp ? ci
cj- ? c01 c01 X ? g g G G X Look
for more events, gg channel in Run 2
_






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Searches diphoton

• Diphoton
• GMSB radiative decay to LSP (gravitino)
• If neutralino NLSP

/
ggEt

• MC gt 113 GeV/c2 _at_ 95 C.L.

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SUSY projected limits
Expected limits for Run 2
(taken from Savoy-Navarra, EPS 99)
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Conclusions
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Conclusions

• Run 2 has just 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!!

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Backup slides
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Jet Cross Section vs h

• QCD sub-processes at small angles
• Central jets are more likely to signal new
  physics (hep-ph 0303013)

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Peak fill luminosity
peak lumi
Run II
05/03
03/01
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Tevatron Operations
Many reasons for not reaching design lumi
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Electroweak m(W) errors
Error Run1b W ? e n Run 1b W ? m n 2 fb-1 W ? e n 2 fb-1 W ? m n
statistical 65 MeV 100 MeV 14 MeV 20 MeV
lepton energy/momentum scale 75 MeV 85 MeV 20 MeV 15 MeV
lepton energy/momentum resolution 25 MeV 20 MeV 8 MeV 6 MeV
W production model 47 MeV 44 MeV 30 MeV 30 MeV
Fitting, selection etc. 5 MeV 31 MeV 14 MeV 16 MeV
Total 113 MeV 143 MeV 42 MeV 40 MeV
Run 1b 110 pb-1
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Heavy flavour physics
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Heavy flavour physics lifetimes

• First measurements which CDF will perform in b
  sector
• Necessary step towards oscillation
• Best measurement of Bs0, Lb. (Unique)

HQET t(B )/ t (B0 )1.05 t( Bs0)/ t (B0
)1.00 t( Lb)/ t (B0 )0.9 to 1.0
Experiment t( Lb)/ t (B0 ) is 0.78-.04
2 fb-1 3000 Bs gt s(ct(Bs)) 0.03 ps 2000 LB gt
s(ct(LB)) 0.04 ps
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Heavy flavour physics lifetimes
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Heavy flavour physics lifetimes
XFT,SVT
Millions of B mesons have already been produced
in RunII. Need to trigger and identify relevant
decays. Leptons easy hadrons difficult
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ct4581011 mm (4694 mm)
Look for J/y ? mm
Next step Bs, LB lifetimes
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Exclusive lifetimes
Bs
B0
t(B)
B
ct446 43stat. 13syst. mm
(502 5)
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Higgs
Look in diffractive mode pp ? pHp Reconstuct from
missing mass of pp system
25-30 GeV mass resolution standard method, 0.5
GeV resolution diffractive mode
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Higgs
s small _at_ Tevatron, reasonable at LHC
Signal (Cudell, Hernandez)
Background