A comprehensive study on the semileptonic decay of heavy flavor mesons
A comprehensive study on the semileptonic decay of heavy flavor mesons
复制标题
重味介子半轻衰变的综合研究
DOI：
10.1007/jhep02(2021)179
复制
发表时间：
2021
影响因子：
5.4
通讯作者：
Chao Wang
中科院分区：
文献类型：
--
作者：
Lu Zhang;Xian-Wei Kang;Xin-Heng Guo;Ling-Yun Dai;Tao Luo;Chao Wang
The semileptonic decay of heavy flavor mesons offers a clean environment for extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements, which describes the CP-violating and flavor changing process in the Standard Model. The involved form factors where the dynamical information is encoded play an essential role in achieving any conclusive statement. That is, the knowledge of the form factors should be under good control, requiring one to examine more observables in addition to the branching fraction. In this paper, we provide the mean value and the q2-dependent shape for further observables [differential decay distribution (dΓ/dq2), forward-backward asymmetry $$ \left({\mathcal{A}}_{FB}^{ls}\right) $$
A
FB
ls
, longitudinal $$ \left({P}_L^l\right) $$
P
L
l
and transverse $$ \left({P}_T^l\right) $$
P
T
l
polarization of a charged lepton, longitudinal polarization of a vector meson in the final state $$ \left({F}_L^l(V)\right) $$
F
L
l
V
, leptonic convexity parameter $$ \left({C}_F^l\right) $$
C
F
l
, and trigonometric moments $$ \left({W}_i^l\right) $$
W
i
l
in the decay of D(s) and B(s) to P/Vl+νl (l = e, μ or τ)], based on the predictions of the relevant form factors from the covariant light-front quark model. P and V denote the pseudoscalar and vector meson, respectively. As a comparison, we find a good agreement with the results from the covariant confining quark model and the relativistic quark model in the literature. As it has been observed that the $$ {P}_L^l $$
P
L
l
and $$ {F}_L^l(V) $$
F
L
l
V
are crucial quantities to discriminate various New Physics models, the reexamination of these observables from a different method is also essential and necessary.
The semileptonic decay of heavy flavor mesons offers a clean environment for extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements, which describes the CP-violating and flavor changing process in the Standard Model. The involved form factors where the dynamical information is encoded play an essential role in achieving any conclusive statement. That is, the knowledge of the form factors should be under good control, requiring one to examine more observables in addition to the branching fraction. In this paper, we provide the mean value and the q2-dependent shape for further observables [differential decay distribution (dΓ/dq2), forward-backward asymmetry $$ \left({\mathcal{A}}_{FB}^{ls}\right) $$
A
FB
ls
, longitudinal $$ \left({P}_L^l\right) $$
P
L
l
and transverse $$ \left({P}_T^l\right) $$
P
T
l
polarization of a charged lepton, longitudinal polarization of a vector meson in the final state $$ \left({F}_L^l(V)\right) $$
F
L
l
V
, leptonic convexity parameter $$ \left({C}_F^l\right) $$
C
F
l
, and trigonometric moments $$ \left({W}_i^l\right) $$
W
i
l
in the decay of D(s) and B(s) to P/Vl+νl (l = e, μ or τ)], based on the predictions of the relevant form factors from the covariant light-front quark model. P and V denote the pseudoscalar and vector meson, respectively. As a comparison, we find a good agreement with the results from the covariant confining quark model and the relativistic quark model in the literature. As it has been observed that the $$ {P}_L^l $$
P
L
l
and $$ {F}_L^l(V) $$
F
L
l
V
are crucial quantities to discriminate various New Physics models, the reexamination of these observables from a different method is also essential and necessary.