https://doi.org/10.1140/epjc/s10052-018-6385-9
Regular Article - Theoretical Physics
Semileptonic B and 
decays involving scalar and axial-vector mesons
1
College of Nuclear Science and Technology, Beijing Normal University, Beijing, 100875, China
2
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai, 200443, China
3
School of Physics and Electronics, Hunan University, Changsha, 410082, China
4
Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425, Jülich, Germany
5
Center for Ecological and Environmental Sciences, Key Laboratory for Space Bioscience and Biotechnology, Northwestern Polytechnical University, Xi’an, 710072, China
* e-mail: luot@fudan.edu.cn
Received:
11
August
2018
Accepted:
27
October
2018
Published online:
9
November
2018
We report our theoretical calculations on the branching fractions for the semileptonic B and decays based on the form factors in the covariant light-front quark model. That is, 
, where P and V denote the pseudoscalar and vector mesons, respectively, while S denotes the scalar meson with mass above 1 GeV and A the axial-vector meson. The branching fractions for the semileptonic 
and V modes have been measured very well in experiment and our theoretical values are in good agreement with them. The ones for 
and A modes are our theoretical predictions. There is little experimental information on the semileptonic decays although much theoretical effort has been done. In addition, we predict the branching fractions of 
and 
as 
and 
, in order, assuming them as the conventional mesons with quark-antiquark configuration. The high luminosity 
collider SuperKEKB/Belle-II is running, with the data sample enhanced by a factor of 40 compared to Belle, which will provide huge opportunity for the test of the theoretical predictions and further help understand the inner structure of these scalar and axial-vector mesons, e.g., the glueball content of 
and the mixing angles for the axial-vector mesons. These decay channels can also be accessed by the LHCb experiment.
© The Author(s), 2018
