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Report from Working Group 2 B/D/K Decays

b. Report from Working Group 2 B/D/K Decays. Conveners Gerhard Buchalla, Luca Silvestrini (theory) Takeshi Komatsubara, Franz Muheim (experiment). Outline. Scope of WG2 Benchmark processes Tasks Experimental Summary. Flavour Physics 2005-2015.

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Report from Working Group 2 B/D/K Decays

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  1. b Report from Working Group 2 B/D/K Decays • Conveners • Gerhard Buchalla, Luca Silvestrini (theory) • Takeshi Komatsubara, Franz Muheim (experiment) GB, TK, FM, LS

  2. Outline • Scope of WG2 • Benchmark processes • Tasks • Experimental Summary GB, TK, FM, LS

  3. Flavour Physics 2005-2015 • High energy colliderBSMPrecision flavour studies • New particle masses flavour couplings • Precision flavour studies • Rare decays  CP violation • B/D/K experiments beyond LHC • Super B factories • Fixed target D/K at PS/SPS or JPARC • Flavour mixing: quarks  leptons • Hadronic uncertainties GB, TK, FM, LS

  4. Benchmark processes • bs, bd, bsll, b s • Bs,d  +- • B  +, D+ • UT angles • Bd  KS, DK, ,  • Bs  DsK, KK • Bs-Bsbar mixing • bs hadronic transitions • Bd  phiKS, … • K , KL 0ll • D0-D0bar mixing, D rare decays • Need info on all possible flavour transitions • bs bd sd • Theoretically clean observables GB, TK, FM, LS

  5. Table from G. Isidori

  6. Pattern of the deviation from the SM Table from M. Hazumi Unitarity triangle Rare decays ++: Large, +: sizable, -: small “DNA Identification” of New Physics from Flavor Structure T.Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka (2002, 2004) + SuperKEKB LoI

  7. List of Tasks • Study complementarity between collider and flavour physics • SUSY benchmark (e.g. SPS1a) in collider physics • Add flavour violation ( squark decays) • Compute effective Hamiltonian (OPE) • Evaluate flavour observables, check consistency with data • Beyond SUSY • NP model independent studies, MFV • Common session WG1 & WG2 • Hadronic Uncertainties • dedicated session at next meeting • Experimental Studies • Sensitivities – LHC, (super-)B & tau/charm factories, fixed target • Triggers, Backgrounds, GB, TK, FM, LS

  8. GB, TK, FM, LS

  9. (Experimental) Summary • Gamma at tree level (includes Vub) • B-> DK Dalitz – Babar/Cavoto, Belle/Gershon, LHCb/Schneider • Bs->DsK, Bs-> K+K- – LHCb/Schneider • Sin2 with penguins • Belle/Gershon • Babar/Pierini • Super-B/Hazumi • Many theory talks • Charm • D0-D0bar mixing, D rare decays, decay constants, comparison with Lattice QCD/ Stone • Kaons • K+ + NA48/Ruggiero, Littenberg • KL 0 E391a/KEK Komatsubara, Littenberg • Theory talks / Buras, Scimemi GB, TK, FM, LS

  10. (Experimental) Summary • Radiative Penguins b-> s, b->d, B->tau nu • Belle/Iijima • BaBar/ Playfer • Electroweak Penguins B(s) -> ll K(*), ll s • Belle/Hazumi/Iijima • Babar/Playfer • LHCb/Koppenburg • Theory/Ligeti • Bs->mumu • LHCb/Schneider • CDF/Oldeman • C0/Ay • Atlas/Nikitine • CMS/Speer GB, TK, FM, LS

  11. (Experimental) Summary • Bs mixing • Mass difference ms, weak mixing phase s lifetime difference s/s, • CDF/Oldeman • D0/Ay • LHCb/Fernandez • Unitarity fits • CKMfitter/ Robert • UTfit/Stocchi GB, TK, FM, LS

  12. SM test - sin2 vs Vub Stocchi sin2b=0.687±0.032 From direct measurement we have a weak sign of a disagreement sin2b =0.791±0.034 from indirect determination expt mb, theory GB, TK, FM, LS

  13. Interference when D final state common to both D0 and D0 Cavoto g from direct CP violation Relative size (rB) of B decay amplitudes Larger rB, larger interference, betterg experimental precision (degrees) 0.1 0.2

  14. Cavoto Gershon  from B->DK Dalitz analysis Sensitivity to g Belle =75,=180,rB=0.125 r(770) DCS K*(892) g=[67°±28°(stat.) ±13°(syst. exp.) ± 11°(Dalitz model*) ] BaBar Belle GB, TK, FM, LS

  15. Projected  uncertainty from B->DK Cavoto Schneider Projected sys error due to D0 Dalitz plot • Candidate for LHCb’s statistically • most precise determination of  • () ~ 5 in one year ? • To be studied during this workshop … GB, TK, FM, LS

  16. NP in Bd-Bd mixing (IV) Robert gandaare of major importance in constraining the NP parameters. NB: sin(2b+2qd+g) is not included. (almost no influence.)

  17. sin2 from Hadronic Penguins GB, TK, FM, LS

  18. sin2 from Hadronic Penguins Limits on SUSY mass insertion parameters GB, TK, FM, LS

  19. Rare Kaon Decays Buras GB, TK, FM, LS

  20. Prospects for K+ -> + at CERN/SPS Ruggiero +1.30 • Present (E787/949): BR(K+p+nn) = 1.47 ×10-10 -0.89 Current constraint on r,h plane 100 events Mean: E787/949 100 events Mean: SM P326 at SPS CERN 80 events GB, TK, FM, LS

  21. Prospects for K0L -> 0 at JPARC Komatsubara GB, TK, FM, LS

  22. Do-Do mixing: the data Stone • The study of Do wrong-sign Kp yields has been a key step in our experimental study of Do Do mixing. • Caveats: • Complicated by interference between DCSD & mixing [strong phase d data constrain only x & y] • Complicated by CP violation Most general fit FLAVOUR IN THE ERA OF THE LHC, Nov. 7-10, 2005

  23. Do Do mixing: the data II Stone • Do semileptonic decays: Rws = ½(x2+y2) [no strong phased] • Dalitz plot analysis of D0 K p+p-(CLEO II.V) comparable sensitivity 0 s FLAVOUR IN THE ERA OF THE LHC, Nov. 7-10, 2005

  24. b -> d gamma Playfer GB, TK, FM, LS

  25. A10/A7 A9/A7 A10/A7 ＳＭ A9/A7 B->K*l+l- F-B asymmetry Belle, 2005 Iijima • 357fb-1 (386M BB) • N(K*ll)=114+-14 (purity 44%) • Unbinned M.L. fit to dG2/dsd(cosq) • 8 event categories • Signal + 3 cross-feed + 4 bkg. • Ali et al’s form factor • Fix |A7| to SM • Float A9/A7 and A10/A7 • Results; w/negative A7 (SM like) w/positive A7 Sign of A9A10 is negative ! See Hep-ex/0508009 & A.Ishikawa’s talk at EPS05 FPCP2004

  26. Koppenburg Iijima Playfer AFB in B->K*ll LHCb Super B-factory Expected precision @ 5ab-1@ 50ab-1 dC9 ~ 11% dC10 ~14% d q02/q02 ~11% ~5% GB, TK, FM, LS

  27. Bs+- at Tevatron CDF 360 pb-1 300pb-1 Excluded! CDF & D0 Bs+- <2.010-7 Bs+- <3.910-7 Combined limit: • Bs+- <1.510-7 hep-ex/0508058 Rolf Oldeman (University of Liverpool) Flavour studies and BSM searches at the Tevatron

  28. Bs +– at LHC Schneider Speer Nikitine • Very rare decay, sensitive to new physics: • BR ~ 3.5  10–9 in SM, can be strongly enhanced in SUSY • Current limit from Tevatron (CDF+D0): 1.5  10–7 at 95% CL GB, TK, FM, LS

  29. RK = (BK)/ (BKee) GB, TK, FM, LS

  30. New Bs mixing results from Tevatron Ay Oldeman D0 CDF D2=1.550.09% ms >8.6ps-1, sensitivity 13.0ps-1 GB, TK, FM, LS

  31. New world average limit 14.5  16.6 ps-1 sensitivity 18.3  20.0 ps-1 Further improvements from • more data • more decay channels (e.g. BsDs*) • Same-side and opposite-side kaon tags Rolf Oldeman (University of Liverpool) Flavour studies and BSM searches at the Tevatron

  32. GB, TK, FM, LS

  33. LHCb ms sensitivity Fernandez GB, TK, FM, LS

  34. LHCb s sensitivity GB, TK, FM, LS

  35. Conclusions • This meeting • many talks by people about New Physics and experimental status and prospects • Major Tasks • Study complementarity between collider and flavour physics • Common session WG1 & WG2 • Hadronic Uncertainties • Experimental Studies • Real “work” in WG2 starts now • Encourage people to come forward • Study groups will be formed soon • Thank you to all involved GB, TK, FM, LS

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