Radiative B Meson Decay as a Probe of Physics Beyond the Standard Model: B(sup o) yields K(sup o)(sub s) pie(sup o) gamma and the B yields phi K gamma Branching Fraction.

Tuggle, J. M.

Technical Information Center Oak Ridge Tennessee

关键词: B mesons;    Decay;    Branching ratio;    Asymmetry;    Physics;   

RP-ID  :  DE2009946450

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The author presents measurements of radiative B meson decays to the final states K(sub s)(sup 0)(pi)(sup 0)(gamma) and K(phi)(gamma) based on data collected at the (Upsilon)(4S) resonance with the BABAR detector at the PEP-II e(sup +)e(sup -) collider at SLAC. In a data sample of 467 million B(bar B) pairs, the time-dependent CP asymmetry in B(sup 0) (yields) K(sub s)(sup 0)(pi)(sup 0)(gamma) decays is measured in two regions of K(sub s)(sup 0)-(pi)(sup 0) invariant mass. In the K* region, 0.8 < m(K(sub s)(sup 0)(pi)(sup 0)) < 1.0 GeV/c(sup 2), we find S(sub K*(gamma)) = -0.03 (+-) 0.29 (+-) 0.03 and C(sub K*(gamma)) = -0.14 (+-) 0.16 (+-) 0.03; in the range 1.1 < m(K(sub s)(sup 0)(pi)(sup 0)) < 1.8 GeV/c(sup 2), they find S(sub K(sub s)(sup 0)(pi)(sup 0)(gamma)) = -0.78 (+-) 0.59 (+-) 0.09 and C(sub K(sub s)(sup 0)(pi)(sup 0)(gamma)) = -0.36 (+-) 0.33 (+-) 0.04. With a sample of 228 million B(bar B) pairs they measure the branching fraction (Beta)(B(sup +) (yields) K(sup +)(phi)(gamma)) = (3.5 (+-) 0.6 (+-) 0.4) x 10(sup -6) and set the limit (Beta)(B(sup 0) (yields) K(sup 0)(phi)(gamma)) < 2.7 x 10(sup -6) at 90% confidence level. The direct CP asymmetry in B(sup +) (yields) K(sup +)(phi)(gamma) is found to be A(sub CP) = (-26 (+-) 14 (+-) 5)%. In each case the uncertainties are statistical and systematic, respectively.