Daria Zieminska Outline Triggers as long as B Lifetime Studies List of Analysis Techniques

Daria Zieminska Outline Triggers as long as B Lifetime Studies List of Analysis Techniques www.phwiki.com

Daria Zieminska Outline Triggers as long as B Lifetime Studies List of Analysis Techniques

Newmark, Craig, Founder of Craigslist.org has reference to this Academic Journal, PHwiki organized this Journal B Lifetime Results from CDF in addition to D0 Daria Zieminska Indiana University (D0 Collaboration) Beauty 2003 See also recent CDF talks: Sinead Farrington, EPS, July 03 : Kevin Pitts, LP03, August 03 Outline Introduction – expectations Tevatron Run II – B triggers in addition to data Inclusive B J/ + X Exclusive B J/ + X channels – B+ J/ + K+ – B0d J/ + K – B0s J/ + – b J/ + Semileptonic B Decays B Hadron Lifetimes: Expectations in addition to Existing Data Heavy Quark Expansion Experiment (B+)/(Bd) = 1.06± 0.02 1.074± 0.014 (Bs)/(Bd) = 1.00± 0.01 0.948 ± 0.038 s / s 0.1 <0.54 (CL=95%) (b)/(Bd) = 0.90 ± 0.05 0.796 ± 0.052 The main goal is to measure the ratios accurately. In the naive quark spectator model, the decay is a 1 3 process common to all b hadrons. (NLO) QCD predicted deviations in agreement with data Christie's Education NY www.phwiki.com

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B Physics at the Tevatron Pros Large BB cross section: – ~ 100 µbarn total – ~ 3-5 µbarn “reconstructible” At 4 x 1031cm-2s-1 ~150 Hz of “reconstructible” B’s All B species produced Tevatron – world best source of Bs in addition to b Production is incoherent – reconstruction of both Bs not needed Cons Large background – B cross section ~10-3 total inelastic – special triggers (leptons, displaced tracks) – combinatorics in reconstruction Typical kinematic cuts: – pT(µ) > 1.5 GeV/c as long as µ’s from J/ – pT(B) > 5 (6) GeV/c – Run II at the Tevatron data available by September shutdown Analyses presented here based on: – CDF 138 pb -1 (di-µ trig.); – D0 114 pb -1 (di-µ trig.); 12 pb -1 (single-µ trig.); Triggers as long as B Lifetime Studies CDF Di-muon (J/) pT(µ) > 1.5 GeV/c , (µ) < 0.7 l + displaced track pT(e/µ) > 4 GeV/c pT(trk) > 2 GeV/c , 120 µm < d 0 (trk) < 1 mm Two displaced tracks pT(trk) > 2 GeV/c , 120 µm < d 0 (trk) < 1 mm D0 Di-muon, pT(µ) > 3 GeV/c, (µ) < 2.2 (unprescaled) pT(µ) > 1.5 GeV/c, (µ) < 2.2 (Lum. dependent prescale) Single µ, pT (µ) > 3-5 GeV/c, (µ) < 2.2 (Lum. dependent prescale) Displaced tracks – after shutdown List of Analysis Techniques 1D: bkg template from sideb in addition to (variations: allow LSB RSB) 2D: simultaneous fit to (mass, c), free bkg parameters Inclusive B J/ + X Lifetime (D0) Measure: = L xy M /pT Need: B = L xy MB /pBT Correction factor: F = / B = M pBT / MB pT MC provides mean F(pT) in slices of pT D0 parametrization of F(pT) 300k J/’s Inclusive B J/ + X Lifetime (D0) Fitting technique Two steps: - fit distribution of the sideb in addition to s to get the shape of the background. The bkg parametrization gbkg(): Prompt taken from MC (Gaussian plus exponential tails) (>0) in addition to (<0) exponentials - fit distribution in the signal region allowing as long as : bkg distribution gbkg() Prompt J/ (similar to prompt bkg) Exponential decay convoluted with Gaussian (bJ/ +X) Inclusive B J/ + X Lifetime D0 in addition to CDF results D0 (114 pb -1 ) = 1.562±0.013(stat)±0.045(syst) ps main syst uncertainties: correction factor: 1.6 % MC bias: 1.9 % 82% J/’s prompt CDF (18 pb -1 , 2002) = 1.526±0.034(stat)±0.035(syst) ps main syst uncertainties: correction factor: 1.1 % resolution function: 1.5 % bkg parametrization: 1.1 % 83% J/’s prompt B+ J/ + K+ Lifetime (D0) Data in addition to Fitting technique 1D fit steps: - Fit distribution of the right sideb in addition to Prompt & (>0) in addition to (<0) exponentials - Fit distribution in the left sideb in addition to with an extra term as long as feeddown from multibody B decay channels - Fit the signal region Norm. of feeddown = 0.12 ± 0.01 (MC) B+J/ K+ ; Results D0 CDF =1.65 ±0.08(stat) +0.09-0.12(syst) ps =1.63±0.05(stat) ±0.04(syst) ps Fit Method: Simultaneous fit of M(B) signal fraction, define sideb in addition to s c(B) lifetime Background Parameterisation: Signal Contribution: Exclusive BJ/X Lifetimes; X= K+, K, (CDF) Bs J/ with Bd J/ K as a control channel CDF D0 138 pb-1 of data 2D fit (Mass, c) Signal events: 120 ± 13 pT(B) > 6 .5 GeV/c pT() > 2 GeV/c run averaged beam spot: 33µm track impact parameter resol: 35µm 114 pb-1 of data 2D fit (Mass, c) Signal events: 69 ± 14 pT(B) > 6 GeV/c pT() > 2 GeV/c pT(K) > 1 GeV/c event by event PV Lxy resolution 40 µm B0s J/ + ; Data (D0) Decay Length resolution Dots – B Line – J/

B0s J/ + ; Data D0 CDF 69±14 c in addition to . 54±10 c in addition to . B0d J/ + K ; Data D0 CDF B0s J/ + ; Fit results D0 CDF =1.19 ±0.18(stat) ±0.14(syst) ps =1.33 ±0.14(stat) ±0.02(syst) ps

B0d J/ + K ; Fit results D0 CDF =1.51 ±0.18(stat) ±0.20(syst) ps =1.51 ±0.06(stat) ±0.02(syst) ps bJ/ Lifetime in addition to Crosscheck (CDF) CONTROL SAMPLE BdJ/K0 Bs in addition to b Lifetimes – Summary

Bs CP =+1 & CP = -1 Lifetimes B0sJ/ unknown mixture of CP =+1 & CP = -1 states St in addition to ard Model predicts s/s ~ 0.1 s = ( Light + Heavy)/2 ; s = Light – Heavy CP=+1 CP=-1 In the case of untagged decay, the CP – specific terms evolve like: CP – even: ( A0(0)2 + A(0)2 ) exp( -Lightt) CP – odd: A(0)2 exp( -Heavyt) Flavor specific final states (e.g. B0slDs ) provide: fs = s – (s)2 / 2s + ( (s)3 / s 2 ) Bs Lifetimes, transversity variable T The CP-even in addition to CP-odd components have distinctly different decay distributions. The distribution in transversity variable T in addition to its time evolution is: d(t)/d cosT (A0(t)2 + A(t)2) (1 + cos2T) + A(t)2 2 sin2T 3 linear polarization states: J/ in addition to polarization vectors: longitudinal (0) to the B direction of motion; transverse in addition to parallel () in addition to ( ) to each other MC distributions as long as CP = +1 & CP= -1 as long as accepted events (D0) Fit extension from 2-D to 3-D in progress Fit extension from 2-D to 3-D in progress Semileptonic Lifetimes The goal is to extract the Bs in addition to b lifetimes using lepton + D0 as a control channel reconstruct the D decay near lepton B decay not fully reconstructed extract the boost factor from MC: extract lifetime from decay length CDF: lepton + displaced track trigger small statistical uncertainty D0: single muon trigger (prescaled at high luminosity)

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Semileptonic Lifetimes (D0) B D0 µ X benchmark analysis 1D Analysis Factor K = pT(D0+µ)/pT(B) from MC (generator level, confirmed with reco’ed tracks) Bkg model: – Prompt & – +ve exp,-ve exp & – additional +ve (left side) Resolution: double Gaussian Results see next page Semileptonic Lifetimes D0 results as long as the B D0 µ X benchmark analysis =1.46 ± 0.083(stat) ps – to be compared with =1.60 ± 0.02 ps WA as long as this channel Summary Lifetime measurements as long as inclusive B J/ X decays in addition to as long as exclusive B J/ X channels by both CDF in addition to D0: Measurements of polarization states in B0s decay in addition to of s/s in progress Lepton + displaced vertex trigger has been implemented at CDF as long as the first time expects high statistical accuracy as long as B0s in addition to Lb lifetime Benchmark measurement of B D0 µ X (D0)

Backup slides Bs Lifetime Summary of existing measurements Flavor-specific final states: fs = s – (s)2 / 2s + ( (s)3 / s 2 ) fs s = ( Light + Heavy)/2 CP=+1 CP=-1 s = Light – Heavy Unknown mixture of Light , Heavy (predominantly CP = +1) Systematic uncertainties (CDF)

Systematic uncertainties (D0)

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