Semileptonic B and Bs decays involving scalar and axial-vector mesons

We report our theoretical calculations on the branching fractions for the semileptonic B and B-s decays based on the form factors in the covariant light-front quark model. That is, B(B-s) -> (P, V, S, A) l nu(l), 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 B -> P and V modes have been measured very well in experiment and our theoretical values are in good agreement with them. The ones for B -> S and A modes are our theoretical predictions. There is little experimental information on the semileptonic B-s decays although much theoretical effort has been done. In addition, we predict the branching fractions of B -> D-0* (2400)l (nu) over bar (l) and B-s -> D-s0*(2317) l (nu) over bar (l) as (2.31 +/- 0.25) x 10(-3) and (3.07 +/- 0.34) x10(-3), in order, assuming them as the conventional mesons with quark-antiquark configuration. The high luminosity e(+)e(-) 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 f(0)(1710) and the mixing angles for the axial-vector mesons. These decay channels can also be accessed by the LHCb