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Time-Dependent CP violation in b g sqq and b g s g decays

Time-Dependent CP violation in b g sqq and b g s g decays. _. Lake Louise Winter Institute Feb.21, 2005 Yutaka Ushiroda (KEK). Outline. Introduction Time-Dependent CP asymmetry (TCPV) Belle & KEKB Results TCPV in charmonium modes TCPV in hadronic b g s penguins

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Time-Dependent CP violation in b g sqq and b g s g decays

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  1. Time-Dependent CP violation in bgsqq and bgsg decays _ Lake Louise Winter Institute Feb.21, 2005 Yutaka Ushiroda (KEK)

  2. Outline • Introduction • Time-Dependent CP asymmetry (TCPV) • Belle & KEKB • Results • TCPV in charmonium modes • TCPV in hadronic bgs penguins • TCPV in radiative bgs penguin • Summary

  3. Time-Dependent CP violation (TCPV) B0 ｆｃｐ ｆｃｐ = B0 mixing B0 mixing B0 Time dependent amplitudes are different because of the KM phase Mixing-induced time-dependent CPV Direct CPV

  4. _ _ _ _ c _ J/Y _ d b b c t w B0 B0 Vtd _ B0 w w t s b d d K0 d V*td Mixing (f1) + Decay w/o KM phase In tree, no room that a NP steps in g SM anchor point

  5. _ _ _ _ _ d b b t B0 B0 w w t b d d Vtd V*td _ _ ~ Extra CPV phase (NP) g _ s b ~ sR _ s g _ ~ d s bR d _ w s f, h’... t g B0 s _ s K0 d

  6. _ B0 Experimental technique m+ J/Y m- B1 (4S) KS fCP electron (8GeV) positron (3.5GeV) nm p- B2 K+ B0 p- m+ Flavor tag Dz ~ 200mm

  7. Mt. Tsukuba KEKB Belle ~1 km in diameter KEKB accelerator 3.5 GeV e+X8.0 GeV e- crossing angle = 11 mrad. Belle World Records Results based on 140fb-1 or 253fb-1

  8. Belle Detector K/pseparation • , p0 reconstruction e+-, KLidentification Aerogel Cherenkov Counter n = 1.015~1.030 Electromagnetic Calorimeter CsI(Tl) 16X0 3.5 GeV e+ TOF counter K/pseparation 8.0 GeV e- charged particle tracking Central Drift Chamber momentum, dE/dx 50-layers + He/C2H6 B vertex Muon / KLidentification Si Vertex Detector 4-layer DSSD KLm detector 14/15 layer RPC+Fe

  9. qxCP=+1 qxCP=-1 poor flavor tag purity good flavor tag sin2f1 result hep-ex/0408111 g 4347 signal events

  10. _ 275M BB Nsig = 13914 purity = 0.63 Nsig=3615 purity = 0.17 S = 0.73 fK0 fit Events/(50MeV/c) sig + bkg_sum bkg_sum sig + B-bkg B-bkg B0gfK0 Poor tag Good tag ~1.9saway preliminary [hep-ex/0409049]

  11. _ 275M BB S = 0.73 fit B0gwKS Nsig = 31  7 purity = 0.56 Raw Asymmetry Good tag ~0.0saway preliminary [hep-ex/0409049]

  12. _ 275M BB S = -0.73 fit B0gKSKSKS Raw Asymmetry Good tag Nsig = 7210 (3 p+p-) + 16 8(2p+p-,1p0p0) = 88 13 Purity = 0.56 (3 p+p-) + 0.40(2p+p-,1p0p0) ~2.8saway preliminary [hep-ex/0409049]

  13. _ 275M BB S = 0.73 fit B0gh’KS Nsig = 512  27 purity = 0.61 Raw Asymmetry Good tag ~0.4saway preliminary [hep-ex/0409049]

  14. _ 275M BB S = -0.73 fit B0gK+K-KS Mixture of CP even/odd [PRL 91, 261602 (2003)] Nsig = 399  28 purity = 0.56 Raw Asymmetry Good tag ~0.9s preliminary [hep-ex/0409049]

  15. _ 275M BB S = 0.73 fit B0gKSp0 Raw Asymmetry Good tag high LHR only Nsig = 168 16 (high LHR) + 83  16 (low LHR) = 251  24 purity = 0.55(high LHR), 0.17 (low LHR) ~0.7s preliminary [hep-ex/0409049]

  16. _ 275M BB S = -0.73 fit B0gf0(980)KS Nsig = 94  14 purity = 0.53 Raw Asymmetry Good tag ~2.9s preliminary [hep-ex/0409049]

  17. “sin2f1” from hadronic bgs penguins ~2.7s w/o theory error Deviation from SM expectation !?

  18. _ _ _ _ d b t B0 B0 w w g t b d _ Vtd _ w b s B0 K0 t d d V*td

  19. (Helicity flip) Introduction AGS [Phys.Rev.Lett. 79, 185 (1997)] TCPV in B0gM0g decay M0 : self-conjugate state (K*0(gKSp0), K1(gKSr0)) g : polarized in the SM. Carries the flavor information. Due to g, the final state is (almost) flavor specific ~10% according to B.Grinstein, Y.Grossman, Z.Ligeti, D.Pirjol [PRD 71, 011504 (2005)] A large CPV New Physics An effect that unpolarizes the g

  20. _ 275M BB S = 0 fit B0gK*0(KSp0)g Poor tag Nsig=57  9 Good tag purity 0.65 preliminary [hep-ex/0409049]

  21. Extended AGS (AGHS) AGHS [hep-ph/0410036] TCPV in B0gP0Q0g decay P0,Q0: self-conjugate spin-0 neutral particle (KSp0,KSh)) K*(892) K2*(1430)

  22. _ 275M BB S = 0 fit B0gKSp0g Poor tag Nsig=105  14 Good tag purity 0.50 preliminary [hep-ex/0410036]

  23. Summary _ TCPV in bgccs We know well about SM TCPV in hadronic bgs penguins 2.7s away from SM expectations with all the Belle results combined TCPV in radiative bgs penguins SM prediction is S~A~0 measured with B0gKsp0g (M(KSp0)<1.8GeV) consistent with 0

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