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Ramblings About TDCPV in B 0   o  (and a mention of B 0  K 0 S  0 )

Ramblings About TDCPV in B 0   o  (and a mention of B 0  K 0 S  0 ). BaBar Physics Workshop July 30 2008 Bruce Schumm UCSC/SCIPP. TDCPV dictated by. Contention:

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Ramblings About TDCPV in B 0   o  (and a mention of B 0  K 0 S  0 )

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  1. Ramblings About TDCPV in B0 o  (and a mention of B0  K0S 0 ) BaBar Physics Workshop July 30 2008 Bruce Schumm UCSC/SCIPP

  2. TDCPV dictated by Contention: Physics can never produce |S|>1 or |C|>1. If either of these happen to be maximal, and you don’t have enough sensitivity to distinguish them from 0, you are not doing physics. How well might we do?

  3. Benchmark: BELLE arXiv:0709.2769v2 [hep-ex] 27 Feb 2008 SIGNAL BELLE’s sample of 48  14 events led to C = -0.44  0.49(stat)  0.14(syst) S = -0.83  0.65(stat)  0.18(syst) Can distinguish S=1 from S=0 at ~90% CL; somewhat better for C

  4. BaBar Not-Yet Public 0 Result (from an analysis optimized for ) 0 0 BaBar 0 fit yield: 35  9 (3.9 ) Compare to BELLE’s 48  14 (3.4 ); BaBar has greater significance. So we should do a little better…?

  5. Back of The Envelope • Assume: • N = 30 background-free events (as opposed to N = 35  9) • Charge-determination dilution factor of • D = 0.35 • I get for time-integrated asymmetry A (is this right?) • A   1.0 – Not particularly good…

  6. Idealized Toy Study (Joel Martinez) • Assume • N = 35 and no background • All events tagged with lepton charge (D = ?) S = 1.10 C = 0.58 Not too encouraging… why?

  7. Idealized Toy Study – Gaussian Fit C = 0.46 S = 0.78 A little more encouraging… perhaps luck plays a role.

  8. Higher statistics… assume • N = 70 and no background • All events tagged with lepton charge S = 0.56 C = 0.31 May not yet have reached the 1/N limit; next step would be to optimize S/B for this measurement.

  9. Higher Statistics Gaussian Fits S = 0.56 C = 0.31 Distributions have become more Gaussian

  10. B0  K0S 0  See BELLE arXiv:0806.1980v1 [hep-ex] 12 Jun 2008 Ceff = 0.05  0.18(stat)  0.06(syst) S = 0.11  0.33(stat)  0.08(syst) after removing K* from K0S 0  (requires measuring rates and estimating relative phase from data  additional subtelty Also, bs suppression ~20 times less than bd  less exciting place to look

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