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

3
Tevatron overview
4
The Tevatron
D0 650 people 18 countries
CDF 706 people 12 countries
5
Tevatron operating parameters
Run 1 Run 2 Now
Date 1992 1996 2001 - 2009 2003
Integrated Luminosity 110 pb-1 4.4 8.6 fb-1 240 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 5.2 x 1031 cm-2 s-1
Bunch spacing 3.5 ms 396 132 ns 396 ns
6
CDF
7
CDF
XFT,SVT triggers
8
(No Transcript)
9
L00
10
SVX
11
ISL
12
Si performance
silicon ladders integrated
average error
gt 90 operational
13
L00 performance
sd0
pT
L00 improves uniformity of impact parameter res.
14
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)
15
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
16
Luminosity
17
Integrated luminosity
Total lumi (pb-1)
Run 1 lumi
Up to 180 pb-1 will be shown
Sep. 2003
Mar. 2001
18
Physics in Run 2
19
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
20
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
21
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.
22
Dijet mass
Highest Et jets seen at the Tevatron!
Consistent with SM
M(jj)1364 GeV/c2
23
Heavy flavour production Run 1
s(B) Phys Rev D65 052005
Nason, Cacciari UPRF-2002-4
Discrepancy from Run 1 B s(data)/s(improved
theory) 1.7 C similar effects seen Aim test
predictions at Run 2
CDF Preliminarys(D)
Cacciari hep-ph/9702389
24
Charm production D0,D,D,Ds
Use SVT (5.8 pb-1) to obtain D0 ? K- p D ? D0
p D ? K- p p Ds ? f p Determine prompt
component (fit D impact parameter) Compare s(D)
to NLO
Combinatorics Wrong K-p
D0 i.p.
25
Charm production D0,D,D,Ds
Nason Cacciari hep-ph/0306212
s(D0, pT ? 5.5 GeV) 13.30.21.5µb s(D, pT
? 6.0GeV) 5.20.10.8µb s(D, pT ? 6.0 GeV)
4.30.10.7µb s(Ds, pT ? 8.0 GeV)
0.750.050.22µb
26
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
27
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
28
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
29
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
30
Heavy flavour using SVT(TOF)
Allows exclusive hadronic decay mode
reconstruction
31
Bs mixing

• xs Dm/G (gt14.4 ps-1_at_95)
• Bs oscillation much faster than Bd because of
  coupling to top quark
• Re(Vts)?0.040 gtRe(Vtd)?0.007
• Use SVT to trigger Bs
• Tag charge at production
• Tag charge at decay
• Measure lifetime

32
Predicted Dms reach

• Current (future) performance
• No. events 1600 (2000) /fb-1
• ?D2 4 (5)
• ?t 67 (50) fs
• Improvements
• More Bs channels
• Better tracking, tagging

• Sensitivity
• Current performance
• ?ms15 ps-1 / 500 pb-1 (2s)
• Future performance
• ?ms 18 ps-1 / 1.7 fb-1
• ?ms 24 ps-1 / 3.2 fb-1
• (both 5s)

33
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
34
Electroweak physics
35
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
36
W,Z results
W?mn
Z ? ee
37
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
44
44
Tevatron only place to study top until LHC startup
38
First dilepton tt candidate
39
Top Results
M(top) (run1) 176.1 6.6 GeV/c2
M(top) 177.5 12.7/-9.4stat ? 7.1sys GeV/c2
40
Top mass motivation
Run 2 expected precision
41
Electroweak single top

• s(t) 0.9 0.1 pb (W)
• s(t) 2.0 0.2 pb (Wg)
• s(t) ?Vtb2
• Tag by 1 high Pt e,m 2 jets ( 1 b) Et
• Expect 18.5 2.9 events, see 19

/
st(combined)lt17.5pb _at_95 C.L.
42
Searches
43
Production and Decay of Higgs
2 fb-1 data 2,000 Higgs (200 H
W,Z) Backgrounds much larger than at LEP
44
8.6 fb-1
4.4 fb-1
LEP mHgt114.4 GeV _at_95 CL
Discover at m(H) 115 GeV ? Exclude m(H) 130 GeV
45
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

46
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) gt 107 GeV
47
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
_






48
Searches diphoton

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

/
ggEt

• MC gt 113 GeV/c2 _at_ 95 C.L.

49
SUSY projected limits
Expected limits for Run 2
(taken from Savoy-Navarra, EPS 99)
50
Conclusions
51
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!!