Measurement of absolute branching fractions of inclusive semileptonic decays of charm and charmed-strange mesons
Measurement of absolute branching fractions of inclusive semileptonic decays of charm and charmed-strange mesons
复制标题
DOI：
10.1103/physrevd.81.052007
复制
发表时间：
2009-12
影响因子：
5
通讯作者：
The Cleo Collaboration
中科院分区：
文献类型：
--
作者：
The Cleo Collaboration
我们测量了D{sup 0}、D{sup+}和D{subS}{sup+}介子的内涵式半轻子分支分数。在这些测量中，我们使用了完整的CLEO-c开符数据样本，在E{subCM}=3.774 GeV时，818PB{sup-1}，给出了D{sup 0}D{sup 0}和D{sup+}D{sup-}事件；在E{subCM}=4.170 GeV时，我们使用了602 PB{sup-1}，给出了D{subS}*{sup{+-}D}{subS}{sup{+-}}事件。我们得到了B(D{sup 0{殖利率}}xe{sup+{nu}}{sube})=(6.46+-0.09+-0.11)%，B(D{sup+{殖利率}}xe{sup+{nu}}{sube})=(16.13+-0.10+-0.29)%，和B(D{SUB S}{sup+{殖利率}}xe{sup+{nu}}{sube})=(6.52+-0.39+-0.15)%，其中第一个不确定性是统计的，第二个是系统的。从这些数据和其他地方获得的寿命来看，得到了半轻子衰变宽度{GAMMA}(D{SUP+{YEYES}}Xe{SUP+{NU}}{SUE})/{GAMMA}(D{SUP 0{YEADS}}XE{SUP+{NU}}{SUE})=0.985{+-}0.015{+-}0.024和{伽马}(D{SUP+{NU}}{SUE})/{GAMMA}(D{SUP 0{YOYES}}Xe{sup+{nu}}{sube})=0.828{+-}0.051{+-}0.025。D{sup+}和D{sup 0}的比例与单位的同位旋对称性预测是一致的，而D{sup+}和D{sup 0}的比例与预期的单位不同。
We have measured the inclusive semileptonic branching fractions of D{sup 0}, D{sup +}, and D{sub s}{sup +} mesons. For these measurements, we have used the full CLEO-c open-charm data samples, 818 pb{sup -1} at E{sub CM}=3.774 GeV, giving D{sup 0}D{sup 0} and D{sup +}D{sup -} events, and 602 pb{sup -1} at E{sub CM}=4.170 GeV, giving D{sub s}*{sup {+-}D}{sub s}{sup {+-}}events. We obtain B(D{sup 0{yields}}Xe{sup +{nu}}{sub e})=(6.46{+-}0.09{+-}0.11)%, B(D{sup +{yields}}Xe{sup +{nu}}{sub e})=(16.13{+-}0.10{+-}0.29)%, and B(D{sub s}{sup +{yields}}Xe{sup +{nu}}{sub e})=(6.52{+-}0.39{+-}0.15)%, where the first uncertainties are statistical and the second are systematic. From these and lifetimes obtained elsewhere, we obtain the ratios of semileptonic decay widths {Gamma}(D{sup +{yields}}Xe{sup +{nu}}{sub e})/{Gamma}(D{sup 0{yields}}Xe{sup +{nu}}{sub e})=0.985{+-}0.015{+-}0.024 and {Gamma}(D{sub s}{sup +{yields}}Xe{sup +{nu}}{sub e})/{Gamma}(D{sup 0{yields}}Xe{sup +{nu}}{sub e})=0.828{+-}0.051{+-}0.025. The ratio of D{sup +} and D{sup 0} is consistent with the isospin symmetry prediction of unity, and the ratio of D{sub s}{sup +} and D{sup 0} differs from unity, as expected.