1 / 27

Time-Dependent CP Asymmetry in B0 Decays: New Physics and Long-Distance Effects

This paper examines the time-dependent CP asymmetry in B0 decays, highlighting the impact of extra CP violating phases from new physics and long-distance effects. The analysis focuses on distinguishing tree-level contamiations, particularly the u-quark penguin contributions, and their implications for determining parameters like sin(2φ1) and other CP parameters. The work integrates theoretical and experimental perspectives, reaffirming consistency with the Standard Model while exploring evidence for new physics interactions in flavor dynamics. Various reconstruction modes and asymmetries are presented, providing insights into ongoing research.

efuru
Télécharger la présentation

Time-Dependent CP Asymmetry in B0 Decays: New Physics and Long-Distance Effects

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. sin2f1/sin2b via penguin processes Beauty 2006 Sep.25-29, Univ. of Oxford Yutaka Ushiroda (KEK)

  2. _ _ b b c J/Y c B0 w d d _ s _ w K0 d s f, h’... t g B0 s _ s K0 d Introduction Time-Dependent CP asymmetry in B0 decays _ Extra CPV phase from New Physics

  3. Long distance effect 2 Tree (Vub) contamination 2 P P’ T T’ mode CP P P’ T T’ Ks 1     4 KsKsKs +1     K+KKs     ~+1 Ks      f0Ks      Ks      4 Ks      SM Contamination Need to know the size to claim NP a Positive Dsin2f1 u-quark penguin ~Vub*Vus

  4. QCDF -0.1 0.1 0.2 0 Dsin2f1/b Theoretical estimates of Dsin2f1/b Short distance effect QCDF: Beneke, PLB 620, 143 (2005) Cheng, Chua, Yang, PRD 73, 014017 (2006) pQCD: Mishima, Sanda, PRD 72, 114005 (2005) SCET: Williamson, Zupan, PRD 74, 014003 (2006) Long distance effect (is small) Cheng, Chua, Soni, PRD 72, 014006 (2005) Lazzaro’s talk at ICHEP06 Three theoretically-clean modes Reviewed in hep-ph/0605301 (talk by Chua in FPCP06)

  5. Status before summer

  6. KS+- : KSgp+p- KS00 : KSgp0p0 Reconstruction modes

  7. KS+- : KSgp+p- KS00 : KSgp0p0 Reconstruction modes

  8. Obtain CP parameters for 2-body and 3-body modes simultaneously hep-ex/0607112 BgK+K-K0 Time-dependent Dalitz Intermediate resonances ( f(1020)K0, f0(980)K0, X0(1550)K0, cc0K0, D+K-, Ds+K-) and NR K+K-KS+- K+K-KS00 K+K-KL 151665 K+K-K0signal

  9. hep-ex/0607112 b measurement (not sin2b) exclude at 4.6s Fit to low K+K- mass region (<1.1GeV) First in f0gK+K- Preliminary fK0: sin2beff = +0.12  0.31(stat)  0.10 (syst) Cf. BaBar 2005

  10. hep-ex/0608039 B0gfK0 fgK+K-, KSgp+p- fgK+K-, KSgp0p0 fgKSKL, KSgp+p- 24618 409 227 30721 fKS signal fgK+K- 11417 fKLsignal B0 momentum New mode B0 mass (bkg subtracted)

  11. hep-ex/0608039 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) • fKS and fKL combined • background subtracted • good tags • Dt g –Dt for fKL unbinned fit SM

  12. hep-ex/0609006 TCPV in B0gf0KS Preliminary f0gp+p- Raw Asymmetry B0 mass 377  25f0KSsignal p+p- mass good tags “sin2f1” = +0.18 0.23(stat)  0.11(syst) A = -0.15  0.15(stat)  0.07(syst)

  13. hep-ex/0609006 “sin2f1” = +0.68 0.15(stat)  0.03(syst) (CP-even) A = -0.09  0.10(stat)  0.05(syst) +0.21 -0.13 TCPV in B0gK+K-KS Preliminary Raw Asymmetry B0 mass 840  34 K+K-KSsignal good tags mixture of CP even and odd states (2005)

  14. KS+- : KSgp+p- KS00 : KSgp0p0 Reconstruction modes

  15. hep-ex/0608039 B0gh'K0 B0 mass B0 momentum (bkg subtracted) h’ rg Ks(p+p-) 794  36  h(2g)pp Ks(p+p-) 363  21  h(3p)pp Ks(p+p-) 100  11 rg Ks(p0p0) 103  15 h(2g)pp Ks(p0p0) 62  9 Total1421 46 h’h(2g)pp KL 392  37 h(3p)pp KL 62  13 Total 454  39

  16. hep-ex/0608039 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 • Consistent with the SM • Consistent with Belle 2005 (Belle 2005: “sin2f1” = +0.620.120.04) • First observation of TCPV • (5.6s) in a single bgs mode • h'KS and h'KL combined • background subtracted • good tags • Dt g –Dt for h'KL

  17. hep-ex/0607100 B0gh'K0 93641 h'KS signal 16821 h'KL signal

  18. hep-ex/0607100 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

  19. KS+- : KSgp+p- KS00 : KSgp0p0 Reconstruction modes

  20. Vertex Reconstruction with KS Extrapolate KS track to the Interaction Point Vertex reconstruction efficiency with a single KS : 30 to 45% (Belle), 60% (BaBar KSp0) Events without the vertex can still be used for A-term measurement. Ks track p+ p- IP profile BCP vertex J/yKS with the KS Vertexing Validity confirmed with J/yKS as a control sample. Raw asymmetry good tag

  21. hep-ex/0608039 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 • background subtracted • good tags 15714 KS +-KS +-KS+- 289 KS +-KS +-KS00 18517 total

  22. hep-ex/0607108 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 11612 KS +-KS +-KS+- 6012 KS +-KS +-KS00 17617 total mB & mmiss instead of mES & DE

  23. hep-ex/0607096 TCPV in B0gp0KS 425  28 p0KSsignal Preliminary missing mass & mB “sin2b” = +0.33  0.26(stat)  0.04(syst) A = -0.20  0.16(stat)  0.03(syst)

  24. hep-ex/0609006 TCPV in B0gp0KS Raw Asymmetry B0 mass 515  32 p0KSsignal good tags Preliminary “sin2f1” = +0.33 0.35(stat)  0.08(syst) A = -0.05  0.14(stat)  0.05(syst)

  25. hep-ex/0609006 TCPV in B0gKS Raw Asymmetry 118  18 KSsignal good tags B0 mass Preliminary “sin2f1” = +0.11 0.46(stat)  0.07(syst) A = -0.09  0.29(stat)  0.06(syst)

  26. hep-ex/0607101 “sin2b” = +0.62 (stat)  0.02(syst) A = +0.43 (stat)  0.03(syst) +0.25 -0.30 +0.23 -0.25 TCPV in B0gwKS 142  17wKSsignal Preliminary

  27. Smaller than bgccs in all of 9 modes Summary Theory tends to predict SM contamination in positive side Naïve average of all b g s modes sin2beff = 0.52 ± 0.05 2.6 s deviation More statistics crucial for mode-by-mode studies

More Related