GeV scale dark matter and B→ K+ missing energy phenomenology in the U(1)_B-L model

2024/07/30 by Yadav, Ajay Kumar, Singirala, Shivaramakrishna, Mohapatra, Manas Kumar +1
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2407.20974

Abstract

We elucidate the recently observed discrepancy in the branching ratio of B⁺→ K⁺ +inv decay mode using a GeV scale scalar dark matter in an anomaly-free U(1)_B-L gauge extension of the Standard Model. We constrain the new parameters by using consistency with the existing bounds on Dark matter relic density, direct detection, collider and BR(B→ K^*νν) measured at the Belle II experiment. We investigate couplings between the mediator and the SM fermions as well as the dark matter particle. We then estimate the branching ratios of b → s ν ν decay processes such as B→ (K⁺,K^*)νν, B_s→ (η,η')νν, B_s→ ϕνν and B_c→ (D_s, D_s^*)νν in a common parameter space, meeting the current experimental bounds of both sectors simultaneously.

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