Semileptonic charm decays D→πlνl and D→Klνl from QCD light-cone sum rules

被引：78

作者：

Khodjamirian, A. ^{[1
]}

Klein, Ch. ^{[1
]}

Mannel, Th. ^{[1
]}

Offen, N. ^{[2
]}

机构：

[1] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany

[2] Univ Paris 11, CNRS, Phys Theor Lab, F-91405 Orsay, France

来源：

PHYSICAL REVIEW D | 2009年 / 80卷 / 11期

关键词：

FORM-FACTORS; COUPLING CONSTANTS; HEAVY;

D O I：

10.1103/PhysRevD.80.114005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a new calculation of the D ->pi and D -> K form factors from QCD light-cone sum rules. The MS scheme for the c-quark mass is used and the input parameters are updated. The results are f(D pi)(+)(0)=0.67(-0.07)(+0.10), f(DK)(+)(0)=0.75(-0.08)(+0.11), and f(D pi)(+)(0)/f(DK)(+)(0)=0.88 +/- 0.05. Combining the calculated form factors with the latest CLEO data, we obtain |V-cd|=0.225 +/- 0.005 +/- 0.003(-0.012)(+0.016) and |V-cd|/|V-cs|=0.236 +/- 0.006 +/- 0.003 +/- 0.013 where the first and second errors are of experimental origin and the third error is due to the estimated uncertainties of our calculation. We also evaluate the form factors f(D pi)(-) and f(DK)(-) and predict the slope parameters at q(2)=0. Furthermore, calculating the form factors from the sum rules at q(2)< 0, we fit them to various parametrizations. After analytic continuation, the shape of the D ->pi, K form factors in the whole semileptonic region is reproduced, in a good agreement with experiment.

引用

页数：16

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