A DETAILED ANALYSIS OF D-MESON, DS-MESON AND B-MESON TRANSITION FORM-FACTORS AND THE DETERMINATION OF [VCB]

被引：31

作者：

KORNER, JG ^{[1
]}

SCHILCHER, K ^{[1
]}

WIRBEL, M ^{[1
]}

WU, YL ^{[1
]}

机构：

[1] UNIV DORTMUND,INST PHYS,W-4600 DORTMUND,GERMANY

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1990年 / 48卷 / 04期

关键词：

D O I：

10.1007/BF01614702

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We study various transition form factors in semi-leptonic decays of D-, D(s)-, B- and B(s)-mesons using the pole dominance assumption. The vector current form factor is found to have only a negligible contribution to the decay rates involving pseudoscalar to vector transitions. In view of this fact we evaluate the form factors from present experimental data on the exclusive semi-leptonic decay rate GAMMA and the ratio GAMMA(L)/GAMMA(T) of the longitudinal and transverse partial decay rates. Some non-leptonic two-body decay rates are also investigated using the factorization ansatz. Consistency with the semi-leptonic decays is found. The transition form factors of the D- and D(s)-mesons are found to contradict the predictions of quark model. In contrast, the experimental data on the transition form factors of B-mesons are found to be consistent with the quark model predictions. The KM matrix element \V(cb)\ is determined to be \V(cb)\ = 0.040 +/- 0.010, a value somewhat smaller than is usually chosen.

引用

页码：663 / 671

页数：9

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