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 1Run 2Now Date 1992 – Integrated Luminosity 110 pb – 8.6 fb pb  c.m. energy 1.8 TeV1.96 TeV Luminosity 2 x cm -2 s -1 2 x cm -1 s x cm -2 s -1 Bunch spacing 3.5  s 396 – 132 ns396 ns

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 pTpT

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 TOF S/N = 2354/93113 S/N = 1942/4517 eg. 

Luminosity

Integrated luminosity Total lumi (pb -1 ) Sep. 2003Mar Run 1 lumi Up to 180 pb -1 will be shown

Physics in Run 2

QCD Jet cross-section, shapes  multijet events Heavy flavour Lifetimes, cross- section, B c,  B, B s studies, CP violation, x s Electroweak W: mass, width, gauge couplings Top: mass, cross- section, branching ratios Searches Higgs SUSY, compositeness, leptoquarks etc. # events in 1 fb

Consistent over 7 orders of magnitude deviation at high Et QCD Vital 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 Et Gluon 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 2 E T = 546 GeV (raw)  det = CDF Run II Preliminary Jet 1 E T = 583 GeV (raw)  det = 0.31  -  view Had E Em E Highest Et jets seen at the Tevatron! M(jj)=1364 GeV/c 2 Consistent with SM

Nason, Cacciari UPRF CDF Preliminary:  (D*) Cacciari: hep-ph/  (B+): Phys Rev D 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: D 0,D +,D *+,D s + Use SVT (5.8 pb -1 ) to obtain D 0  K -   D *+  D 0   D +  K -     D s +    Determine prompt component (fit D impact parameter) Compare  D  to NLO Combinatorics Wrong K-  D 0 i.p.

Charm production: D 0,D +,D *+,D s +  (D 0, p T  5.5 GeV) = 13.3±0.2±1.5µb  (D *+, p T  6.0GeV) = 5.2±0.1±0.8µb  (D +, p T  6.0 GeV) = 4.3±0.1±0.7µb  (D s, p T  8.0 GeV) = 0.75±0.05±0.22µb Nason & Cacciari hep-ph/

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 + ) = ± 0.68 ± 0.94 GeV ( ± 0.5) M(B 0 ) = ± 0.92 ± 0.96 GeV ( ± 0.5) M(B s ) = ± 1.29 ± 0.94 GeV ( ± 2.4) M(  B ) = ± 1.6 ± 1.2 GeV (5624 ± 9) PDG

Charm: M(D s + )-m(D + ) Cross-check of lattice QCD, HQET charm mass Use large SVT triggered charm sample Submitted to PRD! m(D + s )-m(D + ) =  0.38  0.21 MeV/c 2 PDG 02: 99.2  0.5 MeV/c 2

B lifetimes c  (B + ) = 1.63 ± 0.05 ± 0.04 ps (1.671 ± 0.018) c  (B 0 ) = 1.51 ± 0.06 ± 0.02 ps (1.537 ± 0.015) c  (B s ) = 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:

B s mixing x s =  m/  ps  B s oscillation much faster than B d because of coupling to top quark: Re(V ts )  > Re(V td )  Use SVT to trigger B s Tag charge at production Tag charge at decay Measure lifetime B0B0 bs s WW t W+W+ t b B0B0    V tb ~1 Re(V ts )  0.04 P mix (t) = 0.5*(1-cos(  m t)) e -t/ 

Predicted  m s reach Current (future) performance: –No. events: 1600 (2000) /fb -1 –  D 2 = 4 (5) % –  t = 67 (50) fs Improvements: –More B s channels –Better tracking, tagging Sensitivity: Current performance: –  m s =15 ps -1 / 500 pb -1 (2  ) Future performance: –  m s = 18 ps -1 / 1.7 fb -1 –  m s = 24 ps -1 / 3.2 fb -1 –(both 5  )

 m   f    L  –Separate eigenstates and measure each lifetime 1)B S  D S + D S - (CP even) Work continuing in triggering on these difficult hadronic modes (track/vertex/reconstuct) 2)B S  J/  (CP even&odd) Different angular distribution for  allow separation of CP even and odd states 3)B S  J/  (CP odd) complementary method Bs mixing

Electroweak physics

Electroweak:W,Z Run 2 benefits:  (W),  (Z)  12 %  (WW),  (ZZ)  % 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 results WW Z  ee

12% l q q 44% l l q Electroweak: top Run 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  q

First dilepton tt candidate

Top Results M(top) = /-9.4 stat  7.1 sys GeV/c 2 M(top) (run1) = ± 6.6 GeV/c 2

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)  |V tb | 2 Tag by 1 high Pt e,  + 2 jets ( 1 b) + Et Expect 18.5 ± 2.9 events, see 19 /  t 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 m H >114.4 CL 8.6 fb 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: ee  Et ee  Et event in Run 1: radiative decay of neutralino to gravitino? (gravitino lsp) pp   i +  j -   0 1  X   G G + X Look for more events, +  channel in Run 2 / ~~ ~~ ~~ _ /

Searches: diphoton Diphoton: GMSB: radiative decay to LSP (gravitino) If neutralino NLSP: / M C > 113 GeV/c 95% C.L.  E t

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

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!!