児童写生作文力の発達研究<人文・社会科学>

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Observation of D_s1(2536)^+ → D^+π^-K^+ and angular decomposition of D_s1(2536)^+ →D^*+K_S^0

Using 462 fb^{-1} of e^+e^- annihilation data recorded by the Belle detector, we report the first observation of the decay D_s1(2536)^+　→　D+π^-K^+. The ratio of branching fractions \frac{B(D_s1(2536)^+ → D^+π^- K^+}{B(D_s1(2536)^+ → D+K^0}is measured to be (3.27±0.18±0.37)%. We also study the angular distributions in the D_s1(2536)^+　→D*+K_S^0 decay and measure the ratio of D- and S-wave amplitudes. The S-wave dominates, with a partial width of Γ_S/Γtotal=0.72±0.05±0.01.journal articl

Evidence for Direct CP Violation in B0→K+π-Decays

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