Электронный каталог

Статья

Berezhnoy, A.
B *> K&sup(* )M&sub(X)vs. B *> KM&sub(X) as a Probe of a Scalar Mediator Dark-Matter Scenario / A.Berezhnoy, D.Melikhov // EPL: A Letters Journal Exploring the Frontiers of Physics [Electronic resource]. – 2024. – Vol. 145, No. 1. – P. 14001. – URL: https://doi.org/10.1209/0295-5075/ad1d03.

Recently, Belle II reported the observation of the decay B*>KM&sub(X) , where M&sub(X) is the missing mass, with the branching ratio much exceeding *B(B*>K*n*n^-) 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 B*>KM&sub(X) and B*>K* M&sub(X) reactions would be a clean probe of the scalar mediator scenario: i) making use of an observed value *B(B *> KM&sub(X)) *= 5.4*B(B *> K*n*n^-)&sub(SM) 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 *B(B *>K* M&sub(X)) < 2.8 *B(B*>K7sup(* )*n*n^-)&sub(SM). 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.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 322.2 - Космология. Гравитационные волны
Спец.(статьи,препринты) = С 323.5а - Жесткие инклюзивные процессы. Глубоко-неупругое рассеяние. Рождение массивных лептонных пар. Рождение адронов с большим поперечным импульсом
Бюллетени = 29/024