Bc→BsJ form factors and Bc decays into BsJ in covariant light-front approach

Shi, Yu-Ji (INPAC, Shanghai Key Laboratory for Particle Physics and Cosmology, Department of Physics and Astronomy, Shanghai Jiao-Tong University, 200240, Shanghai, China) ; Wang, Wei (INPAC, Shanghai Key Laboratory for Particle Physics and Cosmology, Department of Physics and Astronomy, Shanghai Jiao-Tong University, 200240, Shanghai, China) (State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 100190, Beijing, China) ; Zhao, Zhen-Xing (INPAC, Shanghai Key Laboratory for Particle Physics and Cosmology, Department of Physics and Astronomy, Shanghai Jiao-Tong University, 200240, Shanghai, China)

13 October 2016

Abstract: We suggest to study the Bs and its excitations BsJ in the Bc decays. We calculate the Bc→BsJ and Bc→BJ form factors within the covariant light-front quark model, where the BsJ and BJ denote an s-wave or p-wave b¯s and b¯d meson, respectively. The form factors at q2=0 are directly computed while their q2 -distributions are obtained by extrapolation. The derived form factors are then used to study semileptonic Bc→(BsJ,BJ)ℓ¯ν decays, and nonleptonic Bc→BsJπ . Branching fractions and polarizations are predicted in the standard model. We find that the branching fractions are sizable and might be accessible at the LHC experiment and future high-energy e+e- colliders with a high luminosity at the Z -pole. The future experimental measurements are helpful to study the nonperturbative QCD dynamics in the presence of a heavy spectator and also of great value for the study of spectroscopy.


Published in: EPJC 76 (2016) 555
Published by: Springer/Società Italiana di Fisica
DOI: 10.1140/epjc/s10052-016-4405-1
License: CC-BY-3.0



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