Radiative B Meson Decay as a Probe of Physics Beyond the Standard Model: Time-Dependent CP Violation in B0 → K0S π0 γ and the B → Φ K γ Branching Fraction
The author presents measurements of radiative B meson decays to the final states Ks0π0γ and KΦγ based on data collected at the Υ(4S) resonance with the BABAR detector at the PEP-II e+e- collider at SLAC. In a data sample of 467 million B$$\bar{B}$$ pairs, the time-dependent CP asymmetry in B0 → Ks0π0γ decays is measured in two regions of Ks0-π0 invariant mass. In the K* region, 0.8 < m(Ks0π0) < 1.0 GeV/c2, we find SK*γ = -0.03 ± 0.29 ± 0.03 and CK*γ = -0.14 ± 0.16 ± 0.03; in the range 1.1 < m(Ks0π0) < 1.8 GeV/c2, they find SKs0π0γ = -0.78 ± 0.59 ± 0.09 and C Ks0π0γ = -0.36 ± 0.33 ± 0.04. With a sample of 228 million B$$\bar{B}$$ pairs they measure the branching fraction β(B+ → K+Φγ) = (3.5 ± 0.6 ± 0.4) x 10-6 and set the limit β(B0→ K0Φγ) < 2.7 x 10-6 at 90% confidence level. The direct CP asymmetry in B+ → K+Φγ is found to be A CP = (-26 ±14 ± 5)%. In each case the uncertainties are statistical and systematic, respectively.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 946450
- Report Number(s):
- SLAC-R-916; TRN: US0901144
- Country of Publication:
- United States
- Language:
- English
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