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Abstract <p>The surprising excess of missing-energy events far beyond all standard-model expectations in the weak decays of the charged ground-state <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(B^{+}\)</EquationSource> <!--BPhysMGU2570233Berezhnoy-m5--> </InlineEquation> meson into some charged strange meson, rather recently observed by the Belle-II experiment, may (easily) be explained by the decay of the <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(B\)</EquationSource> <!--BPhysMGU2570233Berezhnoy-m6--> </InlineEquation> meson into the strange meson and a pair of dark-matter fermion and antifermion, mediated by an (intermediate) scalar or vector boson. Thorough inspections of both the total and the differential widths of these decays provide, among others, a simple means for the (straightforward) discrimination of such mediator boson’s scalar or vector nature.</p>

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Analysis of \(\boldsymbol{B\to KM_{X}}\) and \(\boldsymbol{B\to K^{*}M_{X}}\) Decays in Scalar- and Vector-Mediator Dark-Matter Scenarios

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Alexander Berezhnoy,
  • Wolfgang Lucha,
  • Dmitri Melikhov

摘要

Abstract

The surprising excess of missing-energy events far beyond all standard-model expectations in the weak decays of the charged ground-state \(B^{+}\) meson into some charged strange meson, rather recently observed by the Belle-II experiment, may (easily) be explained by the decay of the \(B\) meson into the strange meson and a pair of dark-matter fermion and antifermion, mediated by an (intermediate) scalar or vector boson. Thorough inspections of both the total and the differential widths of these decays provide, among others, a simple means for the (straightforward) discrimination of such mediator boson’s scalar or vector nature.