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Measurements of f 1 / b and f 2 / a

Measurements of f 1 / b and f 2 / a. July 31, 2006 XXXIII International Conference on High Energy Physics (ICHEP’06). Masashi Hazumi (KEK). Many thanks to many people, in particular to: T. Aushev, T. Browder, P. Chang, R. Faccini, K. George, T. Gershon, K. Hara,

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Measurements of f 1 / b and f 2 / a

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  1. Measurements of f1/b and f2/a July 31, 2006 XXXIII International Conference on High Energy Physics (ICHEP’06) Masashi Hazumi (KEK) Many thanks to many people, in particular to: T. Aushev, T. Browder, P. Chang, R. Faccini, K. George, T. Gershon, K. Hara, H. Ishino, A. Lazzaro, S. Olsen, Y. Sakai, O. Tajima and K. Trabelsi

  2. New ResultsfromBaBarand Belle for Stringent Tests of the Kobayashi-Maskawa Model of CP Violation

  3. Main New Results Covered in This Talk(all results are preliminary) K.George • f1 with tree diagram (b gccs) • BaBar: sin2b in B0g J/K0, (2S)KS, hcKS, c1KS, J/K*0 • Belle: sin2f1in B0g J/K0 • f1 with penguin diagram (bgsqq) • BaBar: B0gK+K-K0, h’K0, KSKSKS, KS, rKS, p0KS • Belle: B0gh’K0 ,p0KS • Belle: B0gfK0, K+K-KS , KSKSKS , f 0KS, KS • f2 • BaBar: pp, rr, rp • Belle: pp • Belle: rp O. Tajima A. Lazzaro K.Hara This talk S. Telnov H. Ishino This talk

  4. Remarks • Some other new results and recently published results also mentioned but very briefly. • g/f3-related  R.Kowalewski (next speaker) • My apologies if your favorites are not included

  5. 25th Anniversary of Time-dependent CP Violation (tCPV)

  6. Tribute from S. Olsen We need millions of B and use them to search for mixing and CP violation Tony, are you nuts? Look at this. This took us six months! 5 B mesons

  7. 13 countries, 57 institutes, ~400 collaborators Two Asymmetric-energy B Factories PEP-II at SLAC 9GeV (e-)  3.1GeV (e+) peak luminosity: 1.121034cm-2s-1 Belle BaBar KEKB at KEK 8GeV (e-)  3.5GeV (e+) peak luminosity: 1.651034cm-2s-1 11 nations, 80 institutes, 623 persons world record

  8. Integrated Luminosity As of July 24, 2006 KEKB + PEP-II KEKB for Belle PEP-II for BaBar

  9. 1000/fb !! • Far beyond the design luminosities of both proposals • Triumph in accelerator science reached on July 13, 2006 ~ 1 Billion BB pairs

  10. Motivation sin2b history (1998-2005) Q. What is the main source of CP violation ? A. Kobayashi-Maskawa phase IS the dominant source ! Paradigm shift ! Q. Are there deviations from the CKM picture ? (e.g. new CP-violating phases) • Two promising approaches • Overconstrain the unitarity triangle: precise measurements of • a and b needed • 2) Compare sin2b in tree diagram and penguin diagram (e.g. b g s)

  11. b/f1

  12. J/ b b b KS d d d c c s KS t t c c J/ s d d Time-dependent CP violation (tCPV)“double-slit experiment” with particles and antiparticles Quantum interference between two diagrams box diagram + tree diagram tree diagram Vtd + Vtd You need to “wait” (i.e. Dt0) to have the box diagram contribution.

  13. tCPV in B0 decays e.g. for J/ Ks S = -CPsin2f1 = +sin2f1 A = 0 to a good approximation (CP : CP eigenvalue) Mixing-induced CPV Direct CPV (A = -C a la BaBar)

  14. B0 tag (OF-SF)/(OF+SF) Mixing of D*ln Good tag region _ _ B0 tag B0 tag |Dt| (ps) -xCPsin2f1 B0 tag S = 0.65 A = 0.00 R : detector resolution w : wrong tag fraction (misidentification of flavor)  (1-2w) quality of flavor tagging They are well determined by using control sample D*ln, D(*)p etc…

  15. b/f1 with trees- Results -

  16. _ O. Tajima B0 J/y K0 : 535 M BB pairs B0 J/y KS 0 B0 J/y KL 0 Nsig = 7482 Purity 97 % CP odd Nsig = 6512 Purity 59 % CP even pKL information is poor  lower purity BELLE-CONF-0647 Belle preliminary

  17. _ B0 tag B0 tag _ B0 tag O. Tajima background subtracted B0 J/y KS 0 B0 J/y KL 0 B0 tag Asym. = -xCPsin2f1sinDmDt BELLE-CONF-0647 sin2f1= +0.643 ±0.038 A = - 0.001 ±0.028 sin2f1= +0.641 ±0.057 A = +0.045 ±0.033 stat error stat error

  18. _ B0 tag B0 tag B0 tag _ _ B0 tag B0 tag B0 J/y K0 : combined result O. Tajima B0 J/y KS 0 B0 J/y KL 0 B0 tag Asym. = -xCPsin2f1sinDmDt BELLE-CONF-0647 sin2f1= +0.643 ±0.038 A = - 0.001 ±0.028 sin2f1= +0.641 ±0.057 A = +0.045 ±0.033 stat error stat error

  19. _ 535 M BB pairs B0 tag New ! _ B0 tag O. Tajima B0 J/y K0 : combined result Preliminary previous measurement sin2f1= 0.652  0.044 (388 M BB pairs) _ sin2f1= 0.642 ±0.031 (stat) ±0.017 (syst) A = 0.018 ±0.021 (stat) ±0.014 (syst) Belle preliminary BELLE-CONF-0647

  20. New ! K.George BaBar2006: sin2b in b g ccs Preliminary A = -0.07  0.028  0.018 • B0g J/K0, • (2S)KS, • hcKS, • c1KS, • J/K*0

  21. 2006: BaBar + Belle Consistency with Vub, f3/g R. Kowalewski (next speaker)

  22. New ! New ! b (not sin2b) measurements Preliminary K.George B0gD*+D*-Ks Time-dependent Dalitz analysis (T.Browder, A. Datta et al. 2000)  cos2b > 0 (94%CL, model-dependent) B0gDh0 (h0 = p0 etc.) Time-dependent Dalitz analysis  cos2b > 0 Belle: 98.3%CL (hep-ex/0605023, accepted by PRL) BaBar 87% CL (BABAR-CONF06/017)

  23. b/f1 with penguins

  24. 3 theoretically-clean modes fKs, h’Ks, 3Ks

  25. Results for 3 theoretically-clean modes fK0, h'K0, KsKsKs

  26. _ 535M BB Belle 2006: B0gfK0 signal Three modes 11417 fKLsignal fgK+K-, KSgp+p- fgK+K-, KSgp0p0 fgKSKL, KSgp+p- 30721 fKS signal B0 momentum New ! (bkg subtracted) B0 mass BELLE-CONF-0647

  27. _ 535M BB New ! Belle 2006: tCPV in B0gfK0 Preliminary “sin2f1” = +0.50  0.21(stat)  0.06(syst) A = +0.07  0.15(stat)  0.05(syst) Dt distribution and asymmetry • Consistent with the SM (~1s lower) • Consistent with Belle 2005 (Belle2005: “sin2f1” = +0.440.270.05) • The most precise measurement now • fKS and fKL combined • background subtracted • good tags • Dt g –Dt for fKL unbinned fit SM BELLE-CONF-0647

  28. Obtain CP parameters for 2-body and 3-body modes simultaneously by time-dependent Dalitz fit _ 347M BB BaBar 2006: tCPV in B0gK+K-K0 K+K-KSgp+p- K+K-KSgp0p0 K+K-KL 151665 K+K-K0signal

  29. BaBar 2006: tCPV in B0gK+K-K0 b measurement (not sin2b) Rejected (within SM) 4.6s fK0: sin2beff = +0.12 ± 0.31(stat) ± 0.10 (syst)

  30. _ 535M BB Belle 2006: B0gh'K0 signal 142146 h'KS signal 45439 h'KL signal B0 momentum B0 mass (bkg subtracted)

  31. _ 535M BB New ! Belle 2006: tCPV in B0gh'K0 Preliminary “sin2f1” = +0.64  0.10(stat)  0.04(syst) A = -0.01  0.07(stat)  0.05(syst) Dt distribution and asymmetry • First observation of tCPV • (5.6s) in a single bgs mode • Consistent with the SM • Consistent with Belle 2005 (Belle 2005: “sin2f1” = +0.620.120.04) • h'KS and h'KL combined • background subtracted • good tags • Dt g –Dt for h'KL BELLE-CONF-0647

  32. _ 347M BB New ! BaBar 2006: tCPV in B0gh'K0 Preliminary “sin2b” = +0.55  0.11(stat)  0.02(syst) A = +0.15  0.07(stat)  0.03(syst) “sin2b” 4.9s from zero. Cf. BaBar 2005: “sin2b” = +0.36  0.13  0.03

  33. _ 535M BB New ! Belle 2006: tCPV in B0gKSKSKS Preliminary “sin2f1” = +0.30  0.32(stat)  0.08(syst) A = +0.31  0.20(stat)  0.07(syst) Dt distribution and asymmetry B0 mass 18517 KSKSKS signal • background subtracted • good tags BELLE-CONF-0647

  34. _ 347M BB New ! BaBar 2006: tCPV in B0gKSKSKS Preliminary “sin2b” = +0.66  0.26(stat)  0.08(syst) A = +0.14  0.22(stat)  0.05(syst) Dt distribution and asymmetry 17617 KSKSKS signal

  35. Results for other b g s modes (~20sec/result)

  36. _ 535M BB New ! Belle 2006: tCPV in B0gf0KS Preliminary “sin2f1” = +0.18 0.23(stat)  0.11(syst) A = -0.15  0.15(stat)  0.07(syst) Raw Asymmetry B0 mass 377  25f0KSsignal p+p- mass good tags BELLE-CONF-0648

  37. _ 347M BB New ! BaBar 2006: tCPV in B0gp0KS Preliminary “sin2b” = +0.33  0.26(stat)  0.04(syst) A = -0.20  0.16(stat)  0.03(syst) 425  28 p0KSsignal

  38. _ 535M BB New ! Belle 2006: tCPV in B0gp0KS Preliminary “sin2f1” = +0.33 0.35(stat)  0.08(syst) A = -0.05  0.14(stat)  0.05(syst) Raw Asymmetry B0 mass 515  32 p0KSsignal good tags BELLE-CONF-0648

  39. _ 535M BB New ! Belle 2006: tCPV in B0gK+K-KS Preliminary “sin2f1” = +0.68 0.15(stat)  0.03(syst) (CP-even) A = -0.09  0.10(stat)  0.05(syst) +0.21 -0.13 Raw Asymmetry B0 mass 840  34 K+K-KSsignal good tags BELLE-CONF-0648

  40. _ 535M BB New ! Belle 2006: tCPV in B0gKS Preliminary “sin2f1” = +0.11 0.46(stat)  0.07(syst) A = -0.09  0.29(stat)  0.06(syst) Raw Asymmetry 118  18 KSsignal good tags B0 mass BELLE-CONF-0648

  41. _ 347M BB New ! BaBar 2006: tCPV in B0gwKS Preliminary “sin2b” = +0.62 (stat)  0.02(syst) A = +0.43 (stat)  0.03(syst) +0.25 -0.30 +0.23 -0.25 142  17p0KSsignal

  42. _ 347M BB BaBar 2006: tCPV in B0gr0KS Preliminary “sin2b” = +0.17  0.52(stat)  0.26(syst) A = -0.64  0.41(stat)  0.25(syst) quasi 2-body approach (restricting to the region dominated by r0) 111  19 r0KSsignal

  43. Smaller than bgccs in all of 9 modes Theory tends to predict positive shifts (originating from phase in Vts) 2006: f1 with bgs Penguins Preliminary Naïve average of all b g s modes sin2beff = 0.52 ± 0.05 2.6 s deviation between penguin and tree (b g s) (b g c) More statistics crucial for mode-by-mode studies

  44. Standard penguin (bird), or something else (rabbit may be) ? More statistics crucial for mode-by-mode studies

  45. Other handles to search for new physicswith penguin diagrams • B0g KsKs (b g d penguin): even higher statistics needed • B gKp sum rule [Gronau, Rosner 2005] • A(K0p0) = A(K+p-) + A(K0p+) –A(K+p0) • B0g Ksp0g (electromagnetic penguin) • New physics may lead to right handed currents. This can be investigated using time-dependent CPV measurements of b g sg decays and will be discussed in Barlow's talk. S ~ 0 expected in SM -0.120.11 -0.160.04

  46. f1 “beam” f2 “banana” a/f2

  47. – – – – – – t Vud u b d u b With the tree diagram only d p/r V*ub – Sp+p- = +sin2f2 Ap+p- = 0 B0 B0 t b d p/r B0 d d Mixing diagram Decay diagram (tree) tCPV and f2 (a) f2 VtdV*tb VudV*ub f3 f1 VcdV*cb V*tb Vtd Vtd V*tb 3 possibilities: pp, rr, rp

  48. _ 535M BB New ! H. Ishino Belle 2006: B0→p+p− decay (CP asymmetry) BELLE-CONF-0649 1464±65 signal events p+p− yields first error: stat., second: syst. Large Direct CP violation (5.5s) Large mixing-induced CP violation (5.6s) Preliminary p+p− asymmetry confidence level contour background subtracted

  49. New ! BaBar 2006: tCPV in B0gp+p- S. Telnov Preliminary Evidence for CP violation (3.6s) Direct CP violation not yet observed confidence level contour

  50. History of B0→p+p− decay (C = -A) 2.3s diff. btw. Belle and BaBar

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