CDF Status and Prospects Stephen Miller University of Michigan 5 th International Conference on Hyperons, Charm and Beauty Hadrons June 28, 2002

6/28/022 CDF Run 2 Physics Program Broad range of physics topics includes Top -Mass, Cross section, Single top->Vtb Electroweak - W mass, Di-boson production QCD - High Et jets, photons, Di-jets(Mjj)-> Compositeness Charm - BR’s, Masses, Mixing Bottom - Rare decays, CKM constraints, Lifetimes, Mixing Higgs – Discovery/Exclusion Exotics - Susy, Large Extra dimensions, Z’ Improve Run 1 measurements (110 pb -1 ) Expect 2 fb -1 for Run 2a Upgraded detector New capabilities

6/28/023 CDF B Physics Goals Measurement of CP Violation –B 0 →J/ψKs sin(2β) –B 0 →ππ sin(2α) –B s →D s K sin(2γ) B s mixing measurement –Δm s |Vtd|/|Vts| Radiative B decays –B→K * γ, B s →φγ, Λ b →Λγ Rare B decays –B 0 →µµ Lifetimes, masses, BR’s –B s, B c, Λ b (unique to Tevatron) b production

6/28/024 Ingredients for a B Measurement e.g. Δm s from B s →D s π N depends on Luminosity Trigger cross section Reconstruction efficiency S+B/S Reconstructed mass resolution εD 2 Flavor tagging Tagging efficiency ε Dilution D = 1-2w (w is mistag rate) Particle id σ t proper time resolution vertex resolution σLxy momentum resolution σPt (negligible) limiting factor for B s →D s lν mode Flavor Tag B 0  J/  K s Run I/ RunII B s  D s  Run I/ RunII SameSide π/K2.1 / 2.0 %1.0 / 4.2% SoftLepton2.2 / 2.2 %1.7 / 1.7 % Jet Charge2.2 / 3.0 %3.0 / 3.0 % Opp.Side K - / 2.4 % Total εD / 9.6 %5.7 / 11.3 %

6/28/025 Tevatron Upgrade Upgrade for higher Luminosity –Tevatron Run I 6x6 bunches with 3.5µs bunch spacing –Tevatron Run II 36x36 bunches with 396ns spacing –Further upgrade to 132ns –(fewer interactions per crossing) –Main Ring replaced by Main Injector –Recycler –pbar source upgrade

6/28/026 CDF Detector Upgrade Components from Run 1 Central and extension muon system Central & wall calorimeters Solenoid New for Run 2 Silicon tracker (more coverage, z measurements ) Central tracker (shorter drift time, improved stereo) Time of flight (All New!) End plug calorimeter (complete replacement) Central muon detector (Gaps filled in) Forward muon detectors (1 < |η| < 2) Luminosity Monitor Front end electronics (Run 1 bunch spacing 3.5µs, Run 2 spacing 396/132ns) Trigger (Higher rates, tracking at L1, svt tracks at L2) Software (Fortran → C++/Java)

6/28/027 Silicon Layer 00 1 r-phi layer 1.4 cm from beamline Fully integrated with DAQ Improves impact parameter resolution SVXII 87 cm length (covers luminous region) 5 r-phi layers 3 r-z, 2 r-1.2° stereo Used for SVT trigger Intermediate Silicon Layer (ISL) r-phi and r-1.2° stereo all layers 1 layer |η| <1, 2 layers | η| <2 Gives tracks at higher eta Cooling problems have limited use but is being fixed

6/28/028 Central Tracker COT –8 superlayers (4 axial, 4 2° stereo) –12 measurements/superlayer, 30K channels –Smaller cell size than Run 1 tracker needed for 132ns beam crossing period –Readout with Multi-hit TDCs –dE/dx encoded in pulse width –Hit resolution ~ 175µm COT working very well

6/28/029 Tracking Performance COT: 99.7% single track efficiency COT+SVXII tracks: Preliminary resolutions: σd0 ≈ 23µm σLxy ≈ 60µm includes beam spot resolution of ≈ 35µm Still can improve alignments Numbers don’t include L00 Calibration of E-loss and B field Use J/ψ mass for calibration Cross checked with other particles Energy loss correction depends on material 0.56 g/cm 2 layer added to detector description B field scaled by 0.13% dEdx measurement from COT hits Eloss+Bfield Improved Eloss E-loss default No E-loss

6/28/0210 Time of Flight Detector –216 scintillator bars 2.8 m length 4x4 cm^2 cross section –Coverage to |η| < 1 Performance Goal of 100 ps time resolution gives 2 σ K/π separation for p<1.6 GeV/c 2 σ K/p separation for p<2.7 GeV/c 2 σ π/p separation for p<3.2 GeV/c Preliminary Calibration σ  110 ps

6/28/0211 Time of Flight (cont) φ→KK reconstruction Using generic sample of tracks

6/28/0212 Calorimeter Detector –Scint+Pb/Fe Towers with EM/Hadronic sections Covers 15° in phi, 0.11 in η –2-d strip/wire chamber at EM shower max In Central region Crucial for low energy electrons in trigger and analysis Performance –Fully commissioned –Used for trigger and analysis –Energy scale calibrated to ~1%

6/28/0213 Muon Detectors Central & Extension Muon Detectors –System commissioned and aligned –95% live –Triggering on muon track stubs Forward Muon Detectors (New) –System commissioned –98% live –Alignment underway –Will be added to trigger

6/28/0214 DAQ and Trigger L1 Trigger –Calorimeter towers (Em and Hadronic Et) –SumEt, Missing Et – Muons –Tracks Pt> 1.5 GeV. Matching for e, µ selection L2 Trigger –Calorimeter clusters (plus isolation) –Track matched to Shower Max (electron id) –SVT tracks -> displaced tracks select b, charm –Processors calculate Lxy, (transverse) mass L3 Trigger – Farm of 240 dual processor PC’s –All data available for making decision –Uses full reconstruction (offline code) 50 Hz ~20MB/s Hz 45 kHz

6/28/0215 Physics Goals and the Trigger B and Charm Physics –SVT tracks: Hadronic B s, B→ππ, Charm Displaced impact parameter, 2-D vertex, Lxy cut –Lepton + SVT: Semileptonic B, Radiative B –Dileptons: B→J/ψX QCD –Jets –Diffractive triggers Top –High Et lepton: W→lν –All Hadronic: ttbar→ 6 jets Higgs –High Et lepton: HW production –B-tagging (d0 cut) for H→bbar –H→ττ Exotics –High Et photons –Missing Et –Tau’s (cluster+ isolated track) –B-tagging

6/28/0216 Silicon Vertex Trigger (SVT) Silicon based tracking at L2 –New capability at hadron collider SVX readout on L1A –SVX chip digitizes and stores every 132 ns –Fast parallel readout over optical fiber Track roads seeded by L1 XFT tracks Lookup tables match to pattern of hits –Finds tracks with pt > 2 GeV –Currently match to 4 layers –Will change pattern to 4/5 Track fit gives d0, curvature, phi0, χ2 –σd0 ≈35µm, σc ≈6x10 -6 cm -1 σphi0 ≈1mrad –Correction required for beam offset Beam spot measurement fed back to Tevatron to control beam position –Information available but not yet used

6/28/0217 Hadronic B Trigger Physics goals –B→ππ, B s →KK : CKM angle γ –B s →D s π, D s πππ : B s mixing D s →φπ,K*K, K s K –Charm BR’s, masses Selection –L1: 2 opposite charge tracks, Pt > 2GeV, Δφ cut, dominates L1A bandwidth –L2: 2 svt tracks d0 > 100µm, Lxy cut –Yield for B events lower than expected Will improve with SVX fixes and more efficient track patterns in SVT L xy Beam spot secondary vertex R PTPT

6/28/0218 Lepton + SVT Track Trigger Physics goals Semileptonic B decays B cross section Fragmentation fraction Life time, B + /B 0 B s and  b (B c ) B s mixing (need ~ fb -1 ) Radiative B decays b→sγ (γ→ee) Sample for flavor tagging studies Selection 4 GeV e,  + 2 GeV SVT track Run I single 8 GeV e,  Lower B Et threshold Run1 10 GeV vs Run2 6 GeV ~ 3 x  SVT x Run I yield Radiative decays Large Run II inner material X2.5 gain in acceptance ~10 B d ->K* γ / 100 pb-1 ~few B s -> φγ / 100 pb-1 Lepton + D yieldD0D0 D*DsDs Run I /100 pb Run II /7pb Run II / Run I

6/28/0219 Di-lepton Trigger Physics Goals –B→ J/ψX sin(2β), lifetimes –rare decays B→ll(X) Selection –1.5 GeV dimuon –2 GeV dielectron –2-3X Run I yield Run I: 2 GeV muon, 5 GeV electron

6/28/0220 Charm Physics

6/28/0221 Charm Yields Hadronic trigger gives large charm sample Large percentage of D’s from direct production With 2 fb -1 expect x samples of charm from Fixed Target experiments Decay ModeYield 50pb -1 D 0 →Kπ300K D 0 →KK 20K D 0 → ππ 10K D + →Kππ200K D s →KKπ 10K D* + → D 0 π D 0 →Kπ 80K Λ c →pKπ 300

6/28/0222 Charm Measurements Physics Prospects –Production cross sections for D 0, D +, D* +, D s, Λ c can separate prompt from direct production –Mass measurements mD s - mD +, for D s, D + →φπ –D0– D0 mixing search –CP Violation searches –Rare/Forbidden Decays

6/28/0223 B Physics Prospects Collecting large sample of J/ψ, hadronic and semileptonic b decays (Quoted errors below assume 2fb -1) Broad program of measurements –Lifetimes Measure cτ with error of.01 ps B 0,B + ;.03 ps B s ;.04ps Λ b –b production –Δm d mixing measurement –b hadron masses –Branching ratios –Rare Decays B s, B c, Λ b measurements unique to Tevatron J/ψ→µµ Sample

6/28/0224 B Prospects (cont) Bs mixing –All pieces necessary for measurement are working TOF, Hadronic trigger, SVX, L00 –Hadronic yields lower than expected Working on improving trigger and reconstruction efficiency sin(2β) from B→ J/ψK s –will collect large sample of events Use J/ψ→µµ and ee modes –next step to optimize flavor tags –with 2fb -1 will have competitive measurement σ sin(2β) ≈ 0.06

6/28/0225 B Prospects (cont) B s lifetime difference ΔΓ s – Use B s →J/ψφ mode –Fit lifetime and transversity angle of decay Separates CP even/odd states –Error on ΔΓ s/ Γ of CP asymmetry in B 0 →ππ –Hadronic trigger collecting B 0 →hh sample –Use PID to separate B→Kπ, B→KK –Error on asymmetry of 0.09 γ from B d →ππ, B s →KK –Difference in asymmetries only from CKM phases γ and β Assume SU(3) symmetry –Uses simultaneous fit of time dependent asymmetry –Expect σγ ≈ 10° Requires measurement of β Search for CP violation in B s →J/ψφ –Asymmetry very small in Standard Model Test for new physics –Error on asymmetry of 0.1 to 0.2 (depending on value of x s )

6/28/0226 Summary The CDF detector is working well and collecting data for physics Hadronic trigger greatly extends B and Charm Physics capabilities CDF will collect a very large Charm sample –Expect first charm measurements later this summer –Broad charm physics program for Run 2 B physics program has all the pieces in place –B triggers collecting samples –Detector providing good reconstruction –Particle ID working for flavor tagging Lots of interesting B measurements to come