Regular Article - Theoretical Physics
The light invisible boson in FCNC decays of B and mesons
School of Physics, Harbin Institute of Technology, 150001, Harbin, China
2 Department of Physics, Hebei University, 071002, Baoding, China
3 Hebei Key Laboratory of High-precision Computation and Application of Quantum Field Theory, 071002, Baoding, China
Accepted: 13 June 2021
Published online: 30 June 2021
In this paper, we study the FCNC decay processes of B and meson, in which one invisible particle is emitted. Both the spin-0 and spin-1 cases are considered. The model-independent effective Lagrangian is introduced to describe the coupling between the light invisible boson and quarks. The constraints of the coupling coefficients are extracted by experimental upper limits of the missing energy in B meson decays. The bounds are used to predict the upper limits of branching fractions of corresponding decays, which are of the order of or when final meson is pseudoscalar or vector, respectively. The maximum branch ratios are achieved when –4 GeV, where is the mass of the invisible particle.
© The Author(s) 2021
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