Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma1 CDF hot topics Sandro De Cecco FNAL & INFN Roma 1

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma2 Outline Tevatron performances Recent and new results: – B s mixing – b-hadrons Lifetimes &  s /  s –  b modes – Charmless B d,s decays – Rare decays Summary and perspectives CDF detector and B physics triggers

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma3 Tevatron performances CDF II has collected so far ~ 0.8 fb -1 out of >1 fb -1 delivered by Tevatron. Record peak luminosity is ~ 1.3∙10 32 cm -2 s -1 Around 600 pb -1 are available for B physics (good tracking detector conditions) Current analyses use pb -1 of integrated luminosity 1 fb -1 ! Right on the track of stretched TeV plans

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma4 The CDF II detector CDF Tracking System Particle ID dE/dX in COT Time Of Flight detector Lepton ID Muons: CMU, CMP, CMX  1.1) Electrons: CEM (EM calorimeter) CPR (pre-shower detector)

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma5 B Physics at pp collider All B species produced: B u,B d,B s,B c,  b,  b … With production fractions: f u : f d : f s : f  ≈ 4 : 4 : 1 : 1 Acceptance for other B is 20-40% BUT:  (bb) <<  (pp) (~65 mb)  B have to be selected with specific Triggers Primary Vertex Secondary Vertex I mpact P arameter ( ~100  m) L xy ~ 1 mm B decay b production is so large (~ cm -2 Hz) that we could not even cope with writing it all to tape!  trigger quasi-exclusively on specific decay modes Example: the Secondary Vertex Trigger SVT Online (L2) selection of displaced tracks based on Silicon detector hits.  see talk by Mauro Dell’Orso

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma6 B physics triggers at CDF II 1-Displaced track + lepton (e,  ) 120  m < I.P.(trk) < 1mm P T (lepton) > 4 GeV Semileptonic modes 2-Displaced tracks P T (trk) > 2 GeV 120  m < I.P.(trk) < 1mm  p T > 5.5 GeV fully hadronic modes Di-Muon (J/  ) Pt(  ) > 1.5 GeV J/  modes down to low Pt(J/  ) ~0 (Run II) Conventional at colliders (Run I) + With SVT trigger

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma7 Mixing

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma8 WA experimental limit:  m s > 14.5 ps -1 (95%CL) (LEP+SLD+CDF 1) B s Mixing but: |V ts | >> |V td |   m s >>  m d Measuring  m s /  m d determines |V ts |/|V td | Lattice calculation error O(5%)

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma9 Δm s = 20.5 ± 3.2 ps -1 [14.4, 95% CL  m s = 18.9 ± 1.6 ps -1 [15.7, 95% CL SM CKM-fit prediction for  m s If  m s > 30 ps -1 New 3  (with all constraints) (Δm s not used) compatibility plot SM New Physics models can allow high  m s

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma10 Analysis Strategy B s signal reconstruction – Flavour specific states B s decay time – proper time reconstruction – Lifetime measurement Initial flavour of the B s – Flavour tagging techniques – calibrate on B d mixing A  B 0 Mixing perform a “Blind AMPLITUDE SCAN”: B 0 A-scan  m d = 0.5 ps -1 ↔ A =1

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma11 Two different B s signatures: Fully reconstructed HADRONIC modes: SEMILEPTONIC modes: D P.V. B ,e s s D P.V. B  s s Good proper time resolution High B s mass resolution Selected by Two Track Trigger (SVT) Missing momentum carried by the Diluted proper time resolution Selected by dedicated trigger (l+SVT):

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma12 Flavour tagging Opposite Side Same Side Same Side Kaon: for B 0 s is likely to have close in DR a K+. High  D 2 is expected Soft Lepton (e,  ) due to b  ℓ X ℓ charge correlated to b-flavour Jet Charge: the sum of charges of the b-Jet tracks correlated to the b-flavour Used for today results NOT yet used HADRONICSEMILEPTONIC mdmd (0.503±0.063±0.015) ps -1 (0.498±0.028±0.015) ps -1 Tot.  D 2 (1.12±0.23)%(1.43±0.09)% Muon Tag Calibrate the OS taggers on B 0 mixing 

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma13 B s Amplitude Scan results Semileptonic Hadronic Sensitivity: 8.4 ps -1 Limit:  m s > 7.9 ps 95% CL Sensitivity: 0.4 ps -1 Limit:  m s > 0 ps 95% CL Semileptonic Hadronic Sensitivity: 8.4 ps -1 Limit:  m s > 7.9 ps 95% CL CDF winter ’05 Combined World Average + CDF Run II – Sensitivity: 18.2  18.6 ps -1 – Limit: 14.5 ps -1  see talk by Marco Rescigno

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma14 Near future for  m s With the SAME data: Add new tagging algorithms Same Side Kaon Tag Add more channels Add signals from other triggers Improve decay time resolution with PV event by event With NEW data: Increased Luminosity (0.8fb -1 on tape!) Use new trigger strategies 2 SVT Tracks + tagging muon at trigger level (already in place since summer 2004) x4 statistics +20% better ct res. Hadronic analysis will begin to lead the sensitivity Start to “eat” interesting  m s range (expect comb. sens. ~ 15ps -1 )

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma15 NEW: additional semileptonic B decays From the same data (360 pb -1 ) used in mixing analysis: Use SVT trigger (2 displaced and 2 GeV tracks) Select e and  offline Allow lower LEPTON P T (4  2GeV) Increase the overall acceptance of more than X 3 At low Lepton P T, expect more backgrounds from B  DDX decays

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma16  more semileptonic B s for  m s analysis + 4GeV-lepton + 1 displaced track trigger 2 displaced track trigger Additional new sample overlap with the one already used ~ 20%  Effective ~ X 3 more semileptonic B s yield to be used for MIXING  Expect significant sensitivity increase in semileptonic  m s search

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma17 b-hadron lifetimes and  s /  s

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma18 Full statistics sample still under study. Statistical uncertainty expected: Lifetimes in semileptonic B decays Largest statistics B sample More complicated background 13,300 Signal events 260 pb -1  (B + ) = 1.653±0.029±0.032 ps,  (B 0 ) = 1.473±0.036±0.054 ps  (B+)/  (B0) = 1.123±0.040± www-cdf.fnal.gov/physics/new/bottom/ blessed-bsemi-life / B+B+  ps B0dB0d  ps B0sB0s  0.03 ps bb  ~400 pb -1

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma19 Lifetimes in fully reconstructed modes  (B + ) = 1.661±0.027±0.013 ps  (B 0 ) = 1.511±0.023±0.013 ps  (B s ) = 1.598±0.097±0.017 ps Test for our ability to understand SVT trigger biases Very clean samples Prerequisite for mixing fits KK CDF ’05 preliminary result

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma20 Result (260 pb -1 ) –1/4 heavy - 3/4 light state –Lifetime -  heavy ~ 2 x  light Lifetime difference measures “same” CKM element as  m (oscillation frequency) Exciting!! Need more data –~ 5 % sensitivity by 2009 –  m s = 10 ps -1   S /  S = 7% Test still possible CP violation effect in B s mixing B s  J/  and  s  s B S  J/    +  - K + K - B  VV decays: Heavy and Light state decay with distinct angular distributions and different lifetimes.

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma21 b-Barions

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma22  b modes / C. Tarantino, hep-ph/ Oct 2003  b   c  X Lifetimes are an important experimental reference: –Overlap with B factories  understanding of detector/trigger/analysis biases –Further test on species not produced at B factories:  b   c  NEW:  b Branching ratios: Exp. Theo.

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma23  b Updated knowledge Mass m =  1.7 MeV/c 2 (4.1  2.0) x  c l  (5.5  1.8) % pK + p  < 2.2 x  c (2593) + l  seen  c (2625) + l  seen  c ++   l  seen  c 0   l  seen  c +        seen  b mass Colors: -PDG2004 -CDF contribution beyond current PDG2004

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma24 CP violation and charmless B decays

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma25 Charmless B  hh’ Difficult competition with B factories for t-dependent tagged measurements Interesting B physics measurement of B s BR and A CP (B 0  K  ) Signals overlap within mass resolution Kinematic and dE/dX to disentangle components in a combined fit:  see talk by Simone Donati Future: measure B s lifetime in the CP even mode KK  extract  s /  s

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma26 Charmless B  VV decays Bd→K*Bd→K* ~125 events~44 events Measured BR( B s  ) with 8 events (180 pb -1 ) Update with 360 pb -1 Will go soon for Polarization Amplitude analysis Expected significance similar to B-factories B s →   see talk by Simone Donati ~225 events B s → J/  TTT data overlap with 2  trigger: ~20% Future: measure  s /  s in B s   penguin mode

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma27 Search for B s,d    see talk by Sinead Farrington NEW Results (360 pb -1 ): BR(B s   ) < 1.6×10 90% CL < 2.1×10 95% CL BR(B d   ) < 3.9×10 90% CL < 5.1×10 95% CL These are currently world best limits SM: BR(Bs  ) < 3.8∙10 -9 Sensitive to new physics Ex.:

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma28 … and also at BEAUTY 05: Other VERY INTERESTING results from TEVATRON Heavy Flavour physics on: – B c meson at CDF and D0 – X(3872) at CDF and D0  see talk by William Wester  see talk by Ulrich Kerzel

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma29 Conclusions CDF performed the first B s mixing analysis in run II We foresee a substantial update with new samples, new data collected and improved tagging power for winter 2006 Working to have world class measurements on b-hadron lifetimes and lifetime difference  s /  s Perform complementary studies in the field of charmless B decays: B d,s  hh, B d,s  VV, help digging the penguin sector Huge CDF legacy of knowledge in Beauty to next generation B physics experiments.

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma30 Backup slides

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma31 SVT: the hadronic B trigger  ≈ 47  m ≈ 35  m + 30  m SVT resolution Beam spot size  Online Impact parameter Available at Level 2 trigger (20µs latency)  convolution of transverse size of the beam spot with the impact parameter resolution of the SVT: Impact Parameter distribution Offline  ~ 45  m d beam spot COT track ( 2 parameters) 5 SVX coordinates Impact Parameter (transverse projection) Primary Vertex Secondary Vertex I mpact P arameter ( ~100  m) L xy ~ 1 mm B decay

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma32 HadronicSemileptonic  m s : systematic Uncertainties Physics background at low  m s Prompt background at high  m s Dilution scale factors and templates systematic limited from control sample statistics **Systematic errors are negligible with respect to statistical in both cases**

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma33 Heavy Flavour Production from H b  X in 37 pb -1 of data! PRD 71, (2005) P t > GeV/c  (y<1)  b D0D  0.2  0.5 D*  0.1  0.8 D+D  0.1  0.7 DsDs  0.05  0.22 PRL 91, (2003) bb cc with first 6.5 pb -1 !

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma34 Excited Heavy Flavor states B**(L=1)  B  –B  J/  K and D  modes –Important to understand impact for Same Side Kaon tagging  mixing

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma35 Welcome back to B c Hep-ex/ events 46.0  7.3 events First signal of fully reconstructed B c Direct mass measurement! Mode that gave the first evidence of the B c (CDF Run I) Large yield, no clean resonance though!

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma36 Lifetimes: J/  modes This was the starting point: Clean unbiased sample Precision measurement Reference for biased (e.g. displaced track) triggers Test for the understanding of: Detector Analysis technique Sample composition

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma37 Lifetime in the hadronic B s modes Decay time actually measure transverse quantities: – L xy, P T (B) Un-binned likelihood fit Used: and Combinatorial background ct template from high mass sideband

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma38 Hadronic B-lifetimes results  (B + ) = 1.66 ± 0.03 ± 0.01 ps  (B 0 ) = 1.51 ± 0.02 ± 0.01 ps  (B s ) = 1.60 ± 0.10 ± 0.02 ps Systematic summary  (B + ) /  (B 0 ) = 1.10 ± 0.02 ± 0.01  (B s ) /  (B 0 ) = 1.06 ± 0.07 ± 0.01 ± (stat) ± (syst)  (B + ) = ± ps  (B 0 ) = ± ps  (B s ) = ± ps World Average lifetimes (exp.):  (B + ) /  (B 0 ) = 1.06 ± 0.02  (B s ) /  (B 0 ) = 1.00 ± 0.01 Theory prediction (see Cecilia Tarantino CKM05): CDF

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma39 Lifetime in the semileptonic B s modes c  =  11.9  mc  =  25.7  mc  =  20.1  m Combined ℓ-D s lifetime result:  9.5  m (W.A.: 438  17  m) statistical err.only,  NOT for Averages  (DØ ’05: 426  13  17  m) Real D s backgrounds: prompt and physics

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma40 HQET: baryon lifetimes and B moments B lifetimes  Vcb Dominant uncertainty comes from HQET extraction! CDF can probe HQET and constrain it!  b lifetime C. Tarantino, hep-ph/ Oct 2003 LO NLO LO NLO LO NLO