https://doi.org/10.1140/epjc/s10052-021-09333-z
Regular Article - Theoretical Physics
The light invisible boson in FCNC decays of B and 
mesons
1
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
Received:
27
March
2021
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
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Funded by SCOAP3
