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

p-p collisions at s = 1.96 TeV_

CDF:

706 people

12 countries

D0:

650 people

18 countries

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

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 s 396 – 132 ns 396 ns

CDF

CDF

XFT,SVT triggers

L00

SVX

ISL

Si performance

% silicon ladders integrated

% bad silicon ladders

% good silicon ladders

% average error

> 90% operational

L00 performance

L00 improves uniformity of impact parameter res.

d0

pT

SVT Level 2 Trigger

Level 2 hadronic B trigger(d0) ~ 48 m

15 s 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

TOFS/N = 2354/93113

S/N = 1942/4517

eg.

Luminosity

Integrated luminosity

Total lumi (pb-1)

Sep. 2003Mar. 2001

Run 1 lumi

Up to 180 pb-1 will be shown

Physics in Run 2

Physics in Run 2

QCD Jet cross-section, shapes multijet events

Heavy flavour Lifetimes, cross-section, Bc, B, Bs studies, CP violation, xs

Electroweak W: mass, width, gauge couplings

Top: mass, cross-section, branching ratios

Searches Higgs

SUSY, compositeness, leptoquarks etc.

# events in 1 fb-1

1014

1011

104

107

Consistent over 7 orders of magnitude deviation at high Et

QCDVital to understand QCD in order to perform precision/search physics

BUT

Run 1 inclusive jet cross section

SM explanation

Important gluon-gluon and gluon-quark contributions at high EtGluon PDF @ high x not well known.

Run 2 - more high Et jets:

Test QCD at high Et

Discriminate between new physics and gluon PDF

New bins for Run 2

Dijet mass

Jet 2ET = 546 GeV (raw)

det = -0.30

CDF Run II Preliminary

Jet 1ET = 583 GeV (raw)

det = 0.31

- view

Had E

Em E

Highest Et jets seen

at the Tevatron!

M(jj)=1364 GeV/c2

Consistent with SM

Nason, Cacciari

UPRF-2002-4

CDF Preliminary:(D*)

Cacciari: hep-ph/9702389

(B+): Phys Rev D65 052005

B

C

Discrepancy from Run 1:

(data)/(improved theory) ~ 1.7

C: similar effects seen

Aim: test predictions at Run 2

Heavy flavour production:

Run 1

Charm production: D0,D+,D*+,Ds+

Use SVT (5.8 pb-1) to obtain

D0 K-

D*+ D0

D+ K-

Ds+

Determine prompt component (fit D impact parameter)

Compare D to NLO

Combinatorics

Wrong K-

D0 i.p.

Charm production: D0,D+,D*+,Ds+

(D0, pT 5.5 GeV) = 13.3±0.2±1.5µb

(D*+, pT 6.0GeV) = 5.2±0.1±0.8µb

(D+, pT 6.0 GeV) = 4.3±0.1±0.7µb

(Ds, pT 8.0 GeV) = 0.75±0.05±0.22µb

Nason & Cacciari hep-ph/0306212

Heavy flavour

Run 2 improvements:Better tracking systems

TOF for K- separation

Displaced track triggers

Increased lumi for rare decays

Tevatron only place to study Bs, b baryons, Bc

Measurements in Run 2:Production

Bs mass, lifetime, mixing

CP from Bs, B0

B baryon lifetime, mass

Rare decays, Bc study

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(B) = 5620.4 ± 1.6 ± 1.2 GeV (5624 ± 9)

PDG

Charm: M(Ds+)-m(D+)

Cross-check of lattice QCD, HQET charm mass

Use large SVT triggered charm sample

Submitted to PRD!

m(D+s)-m(D+) = 99.41 0.38 0.21

MeV/c2

PDG 02: 99.2 0.5 MeV/c2

B lifetimes

c(B+) = 1.63 ± 0.05 ± 0.04 ps (1.671 ± 0.018)

c(B0) = 1.51 ± 0.06 ± 0.02 ps (1.537 ± 0.015)

c(Bs) = 1.33 ± 0.14 ± 0.02 ps (1.461 ± 0.057)

c(B) = 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

xs = m/ps@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

B0

b s

sW

t

W+

tbB0

Vtb~1 Re(Vts)0.04

Pmix(t) = 0.5*(1-cos(m t))

e-t/

Predicted ms 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:

ms=15 ps-1 / 500 pb-1

(2)

• Future performance: ms = 18 ps-1 / 1.7 fb-1

ms = 24 ps-1 / 3.2 fb-1

– (both 5)

• m fL– 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/(CP

even&odd) Different angular distribution for allow separation of CP even and odd states

3) BS J/(CP odd)

complementary method

Bs mixing

Electroweak physics

Electroweak:W,Z

Run 2 benefits:

(W), (Z) 12 %

(WW), (ZZ) 13 - 22%

W,Z essential calibration signals for high Et physics

Measurements in 2fb-1:

m(W) measured to 40 MeV (sys. dominated - theory)

(W) measured to 30 MeV

couplings measured to ~0.3

W,Z resultsW

Z ee

12%

l q q

44%44 %

l l q

Electroweak: topRun 2 benefits:

(tt) 40%

More luminosity

Increased b tagging efficiency + lepton acceptance

Tevatron only place to study top until LHC startup

Measurements in 2 fb-1:m(top) ~ 1.2% (cf. 2.9%)

(tt) ~ 10% (cf. 25%)

(single top) ~ 20% (1st!)

|Vtb| ~ 12% (1st!)

q

qq

First dilepton tt candidate

Top Results

M(top) = 177.5 +12.7/-9.4M(top) = 177.5 +12.7/-9.4statstat 7.1 7.1syssys GeV/c GeV/c22

M(top) (run1) = 176.1 ± 6.6 GeV/c2

Top mass motivation

Run 2 expected precision

Electroweak: single top

(t) ~ 0.9 ±0.1 pb (W*) (t) ~ 2.0 ±0.2 pb (Wg)

(t) |Vtb|2

Tag by 1 high Pt e, + 2 jets ( 1 b) + Et

Expect 18.5 ± 2.9 events, see 19

/

t(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

Discover at m(H) ~ 115 GeV Exclude m(H) ~130 GeV

LEP mH>114.4 GeV @95% CL

8.6 fb-1

4.4 fb-1

SUSY: stop

stop decays:

(eg.) t b 1

1

+ l 0

(or) t b W 0

W l

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: eeEt

eeEt event in Run 1:

radiative decay of neutralino to gravitino? (gravitino lsp)

pp i +j

-

01 0

1 + X

G G + X

Look for more events, + channel in Run 2

/

~ ~

~ ~

~ ~

_

/

Searches: diphotonDiphoton:

GMSB: radiative decay to LSP (gravitino)

If neutralino NLSP:

/

MMC C > 113 GeV/c> 113 GeV/c22 @ 95% C.L. @ 95% C.L.

Et

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!!