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<p>We evaluate constraints from flavor changing rare meson decays to a light vector boson <i>X</i>, followed by the decay of the on-shell <i>X</i> into the SM fermions. The flavor changing meson decay emitting the light <i>X</i> is induced by loop processes where the up-type quarks, the <i>W</i> boson, or charged scalar bosons are running inside loops. We calculate all one-loop diagrams with neglecting all masses of light quarks except for the top quark in a general anomaly free extra U(1) model. Our theoretical evaluation of the branching ratio of charged <i>B</i> meson decay and charged kaon decay is compared to experimental results, and we derive new constraints for dark photon, U(1)<sub><i>B−L</i></sub> and U(1)<sub><i>R</i></sub> models.</p>

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New rare meson decay constraints on a light vector in U(1)B−L, U(1)R and the dark photon

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月26日

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  • Osamu Seto,
  • Takashi Shimomura,
  • Shinsuke Yoshida

摘要

We evaluate constraints from flavor changing rare meson decays to a light vector boson X, followed by the decay of the on-shell X into the SM fermions. The flavor changing meson decay emitting the light X is induced by loop processes where the up-type quarks, the W boson, or charged scalar bosons are running inside loops. We calculate all one-loop diagrams with neglecting all masses of light quarks except for the top quark in a general anomaly free extra U(1) model. Our theoretical evaluation of the branching ratio of charged B meson decay and charged kaon decay is compared to experimental results, and we derive new constraints for dark photon, U(1)B−L and U(1)R models.