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arXiv 0906.2983hep-ex
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D介子半轻子衰变到π和K介子的改进测量

Improved measurements of D meson semileptonic decays to pi and K mesons

The CLEO Collaboration, D. Besson

备注：
34 pages, 12 figures, submitted to PRD
发表信息：
Phys.Rev.D80:032005,2009
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摘要：

我们利用整个CLEO-c（3770）-> D \bar{D}事件样本，对应于818 pb^-1的积分亮度和大约540万个D \bar{D}事件，对衰变D ^0-> π^- e^+ v_e、D ^0-> K^- e^+ v_e、D^+ -> π ^0 e^+ v_e和D^+ -> \bar{K}^0 e^+ v_e进行了研究。通过标记分析技术，其中一个D在强子模式下被完全重构，另一个D的半轻子衰变的部分速率在几个q^2仓中被测量。我们使用几种形状因子参数化来拟合这些速率，并报告结果，包括形状因子形状参数和分支分数B（D^0 -> π^- e^+ ν_e）=（0.288 \pm 0.008 \pm 0.003）%，B（D^0 -> K^- e^+ ν_e）=（3.50 \pm 0.03 \pm 0.04）%，B（D^+ -> π^0 e^+ v_e）=（0.405 \pm 0.016 \pm 0.009）%，B（D^+ -> \bar{K}^0 e^+ v_e）=（8.83 \pm 0.10 \pm 0.20）%，其中第一不确定度是统计的，第二不确定度是系统的。从晶格量子色动力学（LQCD）的输入，我们还发现|Vcd| = 0.234 \pm 0.007 \pm 0.002 \pm 0.025和|Vcs| = 0.985 \pm 0.009 \pm 0.006 \pm 0.103，其中第三个不确定度来自LQCD。

英文摘要：

Using the entire CLEO-c ψ(3770)-> D\bar{D} event sample, corresponding to an integrated luminosity of $818 pb^-1 and approximately 5.4 million D\bar{D} events, we present a study of the decays D^0 -> π^- e^+ ν_e, D^0 -> K^- e^+ ν_e, D^+ -> π^0 e^+ ν_e, and D^+ -> \bar{K}^0 e^+ ν_e. Via a tagged analysis technique, in which one D is fully reconstructed in a hadronic mode, partial rates for semileptonic decays by the other D are measured in several q^2 bins. We fit these rates using several form factor parameterizations and report the results, including form factor shape parameters and the branching fractions B(D^0 -> π^- e^+ ν_e) = (0.288\pm0.008\pm0.003)%, B(D^0 -> K^- e^+ ν_e) = (3.50\pm0.03\pm0.04)%, B(D^+ -> π^0 e^+ ν_e) = (0.405\pm0.016\pm0.009)%, and B(D^+ -> \bar{K}^0 e^+ ν_e) = (8.83\pm0.10\pm0.20)%, where the first uncertainties are statistical and the second are systematic. Taking input from lattice quantum chromodynamics (LQCD), we also find |Vcd| = 0.234\pm0.007\pm0.002\pm0.025 and |Vcs| = 0.985\pm0.009\pm0.006\pm0.103, where the third uncertainties are from LQCD.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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