Volume 145, Number 1, January 2024
|Number of page(s)
|Nuclear and plasma physics, particles and fields
|07 February 2024
vs. as a probe of a scalar mediator dark-matter scenario
1 D. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University 119991, Moscow, Russia
2 Joint Institute for Nuclear Research - 141980 Dubna, Russia
3 Faculty of Physics, University of Vienna - Boltzmanngasse 5, A-1090 Vienna, Austria
Received: 5 November 2023
Accepted: 10 January 2024
Recently, Belle II reported the observation of the decay , where MX is the missing mass, with the branching ratio much exceeding which is the only Standard Model (SM) process contributing to this reaction. If confirmed, this might be an indication of new non-SM particles produced in this decay. One of the possible explanations of the observed effect could be light dark-matter (DM) particles produced via a scalar mediator field. We give simple arguments, that a combined analysis of the and reactions would be a clean probe of the scalar mediator scenario: i) making use of an observed value and ii) assuming that the effect is due to the light dark-matter coupling to the top quark via a scalar mediator field, one finds an upper limit . Within the discussed scenario, this upper limit does not depend on the mass of the scalar mediator nor on the specific details of the unobserved dark-matter particles in the final state.
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