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Measurements of time-dependent CP violation in B meson decays to ψ(2S)k0s and φK0sγ

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Item Summary

Title: Measurements of time-dependent CP violation in B meson decays to ψ(2S)k0s and φK0sγ
Authors: Sahoo, Himansu Bhusan
Keywords: B meson
time-dependent CP violation
Issue Date: Dec 2010
Publisher: [Honolulu] : [University of Hawaii at Manoa], [December 2010]
Abstract: In this dissertation, we report improved measurements of time-dependent CP violation parameters for B0(B0) → ψ(2S)K0S. This analysis is based on a data sample of 657 × 106 BB pairs collected at the γ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. One neutral B meson is fully reconstructed in the ψ(2S)K0S CP-eigenstate decay channel, and the flavor of the accompanying B meson is identified as either B0 or B0 from its decay products. CP violation parameters are obtained from the asymmetries in the distributions of the proper-time intervals between the two B decays: S (2S)K0S = +0.72 ± 0.09(stat) ± 0.03(syst), A (2S)K0S = +0.04 ± 0.07(stat) ±0.05(syst).
We also report the first observation of the radiative decay B0 → φK0Sγ using a data sample of 772×106 BB pairs. We observe a signal of 37±8 events with a significance of 5.4 standard deviations including systematic uncertainties. The measured branching fraction is B(B0 → φK0γ) = (2.74 ± 0.60 ± 0.32) × 10−6, where the uncertainties are statistical and systematic, respectively. We also precisely measure B(B+ → φK+γ) = (2.48 ± 0.30 ± 0.24) × 10−6. The observed MφK mass spectrum differs significantly from that expected in a three-body phase-space decay.
The radiative B → φKγ mode is sensitive to new physics from right-handed currents, which could affect the CP asymmetry. Here, we report the first measurement of timedependent CP violation parameters in the B0 → φK0Sγ mode : S = +0.74+0.72−1.05(stat)+0.10−0.24(syst), A = +0.35±0.58(stat)+0.23−0.10(syst). We also report a feasibility study for the radiative decay B → ωKγ.
Description: Ph.D. University of Hawaii at Manoa 2010.
Includes bibliographical references.
Appears in Collections:Ph.D. - Physics

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