Observation of B -> K^0_S pi^+ pi^- and B -> K^*(892) ^+- pi^-+ and measurement of the charge asymmetry in B -> K^*(892)^+- pi^-+

CP violation;maximum likelihood;rare B decays

Sun, Werner Man-Li ; Weinstein, Alan Jay

University:California Institute of Technology

Department:Physics, Mathematics and Astronomy

关键词: CP violation;    maximum likelihood;    rare B decays;   

Others  :  https://thesis.library.caltech.edu/1889/1/thesis.pdf

美国|英语

来源: Caltech THESIS

【 摘 要 】

We report on a search for charmless hadronic B decays to the three-body final states K⁰_Sh^+-pi^-+, K^+-h^-+pi⁰, and K⁰_Sh^+-pi⁰ (h^+- denotes a charged pion or kaon), using 9.12 fb^-1 of integrated luminosity produced at sqrt{s}=10.58 GeV and collected with the CLEO detector.We observe the decay B -> K⁰pi⁺pi^- with a branching fraction (50⁺¹⁰_-9+-7)x10^-6 and the decay B -> K^*(892)^+-pi^-+ with a branching fraction (16⁺⁶_-5+-2)x10^-6, where the uncertainties are statistical and systematic, respectively.Both branching fractions are averages over CP-conjugate states. We also search for a CP-violating asymmetry in the decay B -> K^*(892)^+-pi^-+.We find A_CP(B -> K^*(892)^+-pi^-+)=0.26^+0.33_-0.34^+0.10_-0.08, giving an allowed interval of [-0.31,0.78] at the 90% confidence level. These measurements are used to constrain fundamental parameters of the Standard Model.