1 / 10

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:

pmary
Download Presentation

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

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. 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

More Related