Presentation is loading. Please wait.

Presentation is loading. Please wait.

B s and Λ b Lifetimes and BRs at the Tevatron Satyajit Behari (For the CDF Collab.) Johns Hopkins Univ., Baltimore,USA 25 th September 2006 Beauty 2006,

Published by Modified over 9 years ago

Similar presentations

Presentation on theme: "B s and Λ b Lifetimes and BRs at the Tevatron Satyajit Behari (For the CDF Collab.) Johns Hopkins Univ., Baltimore,USA 25 th September 2006 Beauty 2006,"— Presentation transcript:

1 B s and Λ b Lifetimes and BRs at the Tevatron Satyajit Behari (For the CDF Collab.) Johns Hopkins Univ., Baltimore,USA 25 th September 2006 Beauty 2006, University of Oxford, UK

2 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 2 25th Sep. 2006 Contents Introduction Lifetime Measurements Motivation Λ b lifetimes (Λ b  J/Ψ Λ) B s lifetimes Flavor specific  (B s  D s ℓ )  (B s  D s , D s    ) ΔΓ CP /Γ CP in  L (B s  K + K - ) ΔΓ CP /Γ in BR(B s  D s ( * ) D s ( * ) ) Summary BR Measurements BR(B s  D s ( * ) D s ( * ) ) BR(B s  D s1 (2536)  X) BR(B s  D s D s ) / BR(D s D + ) BR(Bs    ) limits Talk by Cheng-Ju Lin [ Talk by Cheng-Ju Lin ] ΔΓ in Bs  J/Ψ  Talk by Avdhesh Chandra [ Talk by Avdhesh Chandra ] Other talks:

3 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 3 25th Sep. 2006 The Tevatron Main Injector & Recycler Tevatron Chicago   p source Booster pp p p pp 1.96 TeV CDF DØ

4 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 4 25th Sep. 2006 CDF and DØ Detectors in Run 2 Both detectors Silicon microvertex tracker Solenoid High rate trigger/DAQ Calorimeters and muons Good electron, muon ID and acceptance Excellent tracking acceptance |  | < 2-3 L2 trigger on displaced vertices Excellent tracking resolution Good low momentum PID

5 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 5 25th Sep. 2006 B Production at Tevatron Since  (bb) <<  (pp)  Events have to be selected with specific triggers Trigger requirements: large bandwidth, background suppression, deadtimeless Flavor Creation (annihilation) qb q b Flavor Creation (gluon fusion) b g g b Flavor Excitation q q b g b Gluon Splitting b g g g b Tevatron is a source of all B-hadron species, B d, B u, B c, B s and Λ b  b = 29.4 ± 0.6 ± 6.2  b (|η| < 1) ( CDF ) Huge cross-sections compared to the the B-factories but proportionally large backgrounds as well

6 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 6 25th Sep. 2006 Triggers for B Physics CDFDØ Single-/Di-lepton ( CDF/DØ ) A high p T lepton or two leptons with lower p T J/Ψ modes, masses, lifetimes, x-section Yields higher than Run I (low Pt threshold, increased acceptance) CDF lepton + displaced track - semileptonic sample (CDF) p T (e/  ) > 4 GeV/c, 120  m 2 GeV/c Semileptonic decays, lifetimes, flavor tagging B Yields 3x Run I CDF Two displaced vertex tracks - hadronic sample (CDF) p T (Trk) >2 GeV/c, 120  m 5.5 GeV/c X-section, branching ratios, B s mixing… Primary vertex Secondary vertex Impact parameter ~ 1 mm b decays

7 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 7 25th Sep. 2006 Interests in B Hadron Lifetimes Test of non-spectator effects in decays of heavy hadrons which give rise to lifetime hierarchy: ≥≈>»  (B + ) ≥  (B 0 ) ≈  (B s 0 ) >  (Λ b ) »  (B c ) HQE Heavy Quark Expansion includes these effects (expansion in 1/m b ) and predicts lifetime ratios:  (B + )/  (B 0 ) = 1.00 ± 0.05 x (f B /200 MeV) 2  (B s 0 )/  (B 0 ) = 1.00 ± 0.01  (Λ b )/  (B 0 ) ~ 0.9 The B+,B0 lifetimes are precisely measured at B-factories. Λ b and B s 0 ratios are unique to Tevatron. EXPERIMENT THEORY (NLO) C. Tarantino, hep-ph/0310241

8 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 8 25th Sep. 2006 B s Lifetime Difference B s has a large branching fraction to CP eigenstates Dominated by b  ccs transition: Bs  Ds (*)+ Ds (*)- (Bd: b  ccd Cabibbo suppressed, 20x smaller) Ways to measure: Compare  (B s  CP even) to  (B s  CP mixed or CP odd) Angular analysis of B s  J/   separates CP even and CP odd. [ See the talk by Avdhesh Chandra ] Indirect: Measure Br (B s  D s ( * )+ D s ( * )- ),  L (Bs  K + K - ) SM prediction:  s /  s =  L -  H = (9.3 ± 4.6) % ( Beneke et al ) World average:  s /  s = 0.07 +0.09 (SLD, LEP, CDF I results +  (B s )=  (B d ) constraint) -0.07 ( < 0.29 at 95% CL) hep-ph/0012222

9 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 9 25th Sep. 2006 Λ b Lifetimes

10 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 10 25th Sep. 2006 Λ b Lifetime in Λ b  J/Ψ Λ 1 fb -1 data 174 ± 21 Λ b events Extract lifetime by an unbinned maximum likelihood fit to mass and proper decay length. Major source of systematic is contamination from B 0 Using B 0  J/Ψ K s 0 lifetime:

11 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 11 25th Sep. 2006 Λ b Lifetime in Λ b  J/Ψ Λ 1 fb -1 data 538 ± 38 Λ b events Major sources of systematics are due to modeling of ct resolution and V 0 pointing Using world average B 0  J/Ψ K s 0 lifetime: World best measurement!

12 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 12 25th Sep. 2006 Λ b Lifetime – Measurement vs Theory The world average on  (Λ b )/  (B 0 ) measurements used to show ~2σ lower value than the NLO prediction so far. The new result sits above the prediction! Need more experimental inputs to conclude the issue. Looking forward to  (Λ b ) in fully hadronic decay modes, e.g. Λ b  Λ c   (Λ b )/  (B 0 )

13 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 13 25th Sep. 2006 B s Lifetime Differences

14 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 14 25th Sep. 2006 400 pb -1 360 pb -1 B s Lifetime  (B s  D s ℓ  X) World’s best result!

15 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 15 25th Sep. 2006 B s Lifetime  (B s  D s , 3  ) Fully reconstructed hadronic decays from displaced track trigger 360 pb -1 in CDF Run 2. Trigger bias is removed by a Monte Carlo approach. Mass and decay length fitted simultaneously to extract lifetime. Would be updated for 1 fb -1

16 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 16 25th Sep. 2006 ΔΓ CP /Γ CP in  L (B s  K + K - ) Measure  L (95% CP even state) 360 pb -1 data from displaced track trigger Four h + h - components are resolved by mass, kinematics and PID info. B d lifetime is fixed to world average Dominant systematics from dE/dx based PID, MC p T input spectrum Extract ΔΓ CP /Γ CP using flavor specific  (B s 0 ) from other measurements.

17 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 17 25th Sep. 2006 ΔΓ CP /Γ CP in BR(B s  D s ( * ) D s ( * ) ) 1 fb -1 sample D s  , D s         Start with  D s sample (D s   ), look for additional  D s  sample  Ratio of efficiencies estimated using simulated events. Directly fit D s mass distribution to extract N(  D s ). Unbinned likelihood to extract N(  D s ) (Lower statistics)  D s  = 15225  310  D s  = 19.3  7.9 Dominant sources of systematics: BR(Bs   D s (*) ) MC p T reweighting

18 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 18 25th Sep. 2006 Tevatron ΔΓ CP /Γ CP Summary

19 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 19 25th Sep. 2006 B s Branching Fractions

20 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 20 25th Sep. 2006 Bs  D s1 (  )  X Bs  Ds**  D* K S D0   K  c+s quark in L=1 state : Provide test HQET A significant fraction of semileptonic decays : Compare exclusive/inclusive decay rates Extract CKM matrix elements An additional channel for Bs mixing. Need to develop more understanding in the light of discoveries which don’t agree with predictions : DsJ(2317), DsJ(2460), DsJ(2632) – SELEX and so on…

21 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 21 25th Sep. 2006 Bs  D s1 (  )  X(Contd..) N = 42.6  8.6 ~ 5  BR(B s ->D s1  X ) = 0.86  0.16  0.13  0.09 (%) ISGW2 0.53%, IQM 0.39%, HQET&QCD Sum rules 0.20% Comparison with theory

22 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 22 25th Sep. 2006 BR(B s  D s D s ) / BR(B 0  D s D - ) fs/fd * BR(Bs → DsDs ) / BR(B0 → DsD+) = 0.43 ± 0.11(Stat) ± 0.03(Syst) ± 0.10(BR) BR(Bs → DsDs ) / BR(B0 → DsD+ ) = 1.67 ± 0.41(Stat) ± 0.12(Syst) ± 0.24 (fs/fd) ± 0.39(BR) 5.8σ Observation!

23 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 23 25th Sep. 2006 Summary With over 1 fb -1 accumulated data / experiment and much more to come, heavy flavor physics at Tevatron is entering a precision era. Using large B s and Λ b samples, unique to Tevatron, various theoretical predictions are put to stringent tests. Many world best measurements have been made. Lifetimes in fully hadronic Λ b decays are underway. Other excited baryonic modes to follow. Check out more Tevatron B physics results: CDF: CDF: http://www-cdf.fnal.gov/physics/new/bottom/bottom.html DØ: DØ: http://www-d0.fnal.gov/Run2Physics/WWW/results/b.htm

24 S.Behari, Bs / Lb Lifetime and BRs at the Tevatron, Beauty 2006 24 25th Sep. 2006 Backup-1 ΔΓ CP /Γ CP in BR(B s  D s ( * ) D s ( * ) ) Background processes:

Download ppt "B s and Λ b Lifetimes and BRs at the Tevatron Satyajit Behari (For the CDF Collab.) Johns Hopkins Univ., Baltimore,USA 25 th September 2006 Beauty 2006,"

Similar presentations

Prospect for  s measurement at LHC Alessia Satta on behalf of the LHCb collaboration + some Atlas and CMS results Physics at LHC, 3 rd october 2008.

Prospect for  s measurement at LHC Alessia Satta on behalf of the LHCb collaboration + some Atlas and CMS results Physics at LHC, 3 rd october 2008.
Title Gabriella Sciolla Massachusetts Institute of Technology Representing the BaBar Collaboration Beauty 2005 - Assisi, June 20-24, 2005 Searching for.

Title Gabriella Sciolla Massachusetts Institute of Technology Representing the BaBar Collaboration Beauty Assisi, June 20-24, 2005 Searching for.
1 Rare Decays of B Hadrons at CDF Matthew Jones October 3, 2005.

1 Rare Decays of B Hadrons at CDF Matthew Jones October 3, 2005.
ICFP 2005, Taiwan Colin Gay, Yale University B Mixing and Lifetimes from CDF Colin Gay, Yale University for the CDF II Collaboration.

ICFP 2005, Taiwan Colin Gay, Yale University B Mixing and Lifetimes from CDF Colin Gay, Yale University for the CDF II Collaboration.
Search for B s oscillations at D  Constraining the CKM matrix Large uncertainty Precise measurement of V td  properly constrain the CKM matrix yield.

Search for B s oscillations at D  Constraining the CKM matrix Large uncertainty Precise measurement of V td  properly constrain the CKM matrix yield.
22 July 2005Mauro Donega HEP20051 B s lifetimes in hadronic decays at CDF Mauro Donegà Université de Genève on behalf of the CDF collaboration.

22 July 2005Mauro Donega HEP20051 B s lifetimes in hadronic decays at CDF Mauro Donegà Université de Genève on behalf of the CDF collaboration.
Recent Electroweak Results from the Tevatron Weak Interactions and Neutrinos Workshop Delphi, Greece, 6-11 June, 2005 Dhiman Chakraborty Northern Illinois.

Recent Electroweak Results from the Tevatron Weak Interactions and Neutrinos Workshop Delphi, Greece, 6-11 June, 2005 Dhiman Chakraborty Northern Illinois.
1 B s  J/  update Lifetime Difference & Mixing phase Avdhesh Chandra for the CDF and DØ collaborations Beauty 2006 University of Oxford, UK.

1 B s  J/  update Lifetime Difference & Mixing phase Avdhesh Chandra for the CDF and DØ collaborations Beauty 2006 University of Oxford, UK.
Heavy Flavor Production at the Tevatron Jennifer Pursley The Johns Hopkins University on behalf of the CDF and D0 Collaborations Beauty 2006 - University.

Heavy Flavor Production at the Tevatron Jennifer Pursley The Johns Hopkins University on behalf of the CDF and D0 Collaborations Beauty University.
The new Silicon detector at RunIIb Tevatron II: the world’s highest energy collider What’s new?  Data will be collected from 5 to 15 fb -1 at  s=1.96.

The new Silicon detector at RunIIb Tevatron II: the world’s highest energy collider What’s new?  Data will be collected from 5 to 15 fb -1 at  s=1.96.
BR = (14 +6 -5 (stat) ± 2(syst) ± 5 (BR))  10 -5 From PDG * From MC * BR(  needs to be rescaled for f s /f d From Data b->sss pure penguin amplitude.

BR = ( (stat) ± 2(syst) ± 5 (BR))  From PDG * From MC * BR(  needs to be rescaled for f s /f d From Data b->sss pure penguin amplitude.
CHARM 2007, Cornell University, Aug. 5-8, 20071Steven Blusk, Syracuse University D Leptonic Decays near Production Threshold Steven Blusk Syracuse University.

CHARM 2007, Cornell University, Aug. 5-8, 20071Steven Blusk, Syracuse University D Leptonic Decays near Production Threshold Steven Blusk Syracuse University.
1 B Physics at CDF Junji Naganoma University of Tsukuba “New Developments of Flavor Physics“ Workshop Tennomaru, Aichi, Japan.

1 B Physics at CDF Junji Naganoma University of Tsukuba “New Developments of Flavor Physics“ Workshop Tennomaru, Aichi, Japan.
Beauty 05, Assisi 20-06-2005 Sandro De Cecco - FNAL & INFN Roma1 CDF hot topics Sandro De Cecco FNAL & INFN Roma 1.

Beauty 05, Assisi Sandro De Cecco - FNAL & INFN Roma1 CDF hot topics Sandro De Cecco FNAL & INFN Roma 1.
Chris Barnes, Imperial CollegeWIN 2005 B mixing at DØ B mixing at DØ WIN 2005 Delphi, Greece Chris Barnes, Imperial College.

Chris Barnes, Imperial CollegeWIN 2005 B mixing at DØ B mixing at DØ WIN 2005 Delphi, Greece Chris Barnes, Imperial College.
B Production and Decay at DØ Brad Abbott University of Oklahoma BEACH 2004 June 28-July 3.

B Production and Decay at DØ Brad Abbott University of Oklahoma BEACH 2004 June 28-July 3.
Donatella Lucchesi1 B Physics Review: Part II Donatella Lucchesi INFN and University of Padova RTN Workshop The 3 rd generation as a probe for new physics.

Donatella Lucchesi1 B Physics Review: Part II Donatella Lucchesi INFN and University of Padova RTN Workshop The 3 rd generation as a probe for new physics.
B S Mixing at Tevatron Donatella Lucchesi University and INFN of Padova On behalf of the CDF&D0 Collaborations First Workshop on Theory, Phenomenology.

B S Mixing at Tevatron Donatella Lucchesi University and INFN of Padova On behalf of the CDF&D0 Collaborations First Workshop on Theory, Phenomenology.
03/09/2008 Md. Naimuddin 1 Masses, Lifetimes and Mixings of B and D hadrons Md. Naimuddin (on behalf of CDF and D0 collaboration) Fermi National Accl.

03/09/2008 Md. Naimuddin 1 Masses, Lifetimes and Mixings of B and D hadrons Md. Naimuddin (on behalf of CDF and D0 collaboration) Fermi National Accl.
Alexander Khanov 25 April 2003 DIS’03, St.Petersburg 1 Recent B Physics results from DØ The B Physics program in D Ø Run II Current analyses – First results.

Alexander Khanov 25 April 2003 DIS’03, St.Petersburg 1 Recent B Physics results from DØ The B Physics program in D Ø Run II Current analyses – First results.

Similar presentations

Ads by Google