Model for nonleptonic and semileptonic decays by (B)over-bar0 → D**-transitions with BR(j=1/2) << BR(j=3/2) using the Leibovich-Ligeti-Stewart-Wise scheme

被引：4

作者：

Le Yaouanc, Alain ^{[1
]}

Leroy, Jean-Pierre ^{[1
]}

Roudeau, Patrick ^{[1
]}

机构：

[1] Univ Paris Saclay, CNRS, IN2P3, IJCLab, F-91405 Orsay, France

来源：

PHYSICAL REVIEW D | 2022年 / 105卷 / 01期

关键词：

B DECAYS; HEAVY; MESONS; FACTORIZATION;

D O I：

10.1103/PhysRevD.105.013004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a model for the vector and axial form factors of the transitions (B) over bar (0) -> D** in good agreement with the presently available data and based on the present theoretical knowledge, combining (a) the safe lattice QCD predictions at m(Q) = infinity and w = 1; (b) the predictions at general w of a relativistic, covariant quark model at m(Q) = infinity, including the well-tested Godfrey and Isgur spectroscopic model and which agrees with lattice QCD at w = 1; (c) the constraint of Bjorken and Neubert relating semileptonic and class I nonleptonic decays, which shows that (B) over bar (0) -> D-0(2300)(+)pi(-) strongly constrains tau(1/2)(w) to be much smaller than tau(3/2)(w), in agreement with the theoretical expectation; and (d) the general HQET expansion which constrains the 1/m(Q) corrections (cf. Leibovich et al. Phys. Rev. Lett. 78, 3995 (1997)., denoted hereafter as LLSW). An important element in the understanding of data is the large contribution of virtual V to the broad structures seen in SL decays at low D-(*)pi masses-which makes it difficult to isolate the broad resonances denoted as D-1/2 in the following.

引用

页数：29

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