Observation of B → K⁰ₛ π⁺ π⁻ and B → K*(892)⁺⁻π⁻⁺ and Measurement of the Charge Asymmetry in B → K*(892)⁺⁻π⁻⁺

Citation

Sun, Werner Man-Li (2003) Observation of B → K⁰ₛ π⁺ π⁻ and B → K*(892)⁺⁻π⁻⁺ and Measurement of the Charge Asymmetry in B → K*(892)⁺⁻π⁻⁺. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/B515-7D62. https://resolver.caltech.edu/CaltechETD:etd-05202003-230218

Abstract

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.

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