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Constraining light dark matter and mediator with B^+ rightarrow K^+ ν bar ν data
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Constraining light dark matter and mediator with B^+ rightarrow K^+ ν bar ν data
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We study the decay of $B^+$ meson into $K^+$ plus a light mediator $\phi$, which subsequently decays into a dark matter pair, $\bar \chi \chi$. Integrating constraints from DM relic density, direct detection, collider data and $B$-physics, alongside the recently reported results form Belle II experiment, we analyze the couplings between the mediator, standard model fermions, and the dark matter particles. Our results indicate that if the decay process $\phi \rightarrow \bar \chi \chi$ is kinematically allowed, i.e. $m_\phi > 2m_\chi$, then the mediator mass must be constrained within 0.35 GeV $\lesssim m_\phi \lesssim$ 3 GeV. Conversely, if $m_\phi < 2m_\chi$, the mediator $m_\phi$ is long-lived relative to the detector size, and the only allowed decay channel is $\phi \rightarrow e^+ e^-$.
Forward citations
Cited by 3 Pith papers
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Radiative generation of chiral vector operators in $b\to s \nu\bar{\nu}$ transition
Minimal one-loop models that generate both chiral vector operators for b→sνν̄ are systematically classified but cannot quantitatively explain the Belle II anomaly.
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Dark Matter emission at Belle II and NA62 in Minimal Flavor Violation framework
A single nearly degenerate dark matter multiplet in the MFV framework can accommodate either the K+ to pi+ nu nubar or B+ to K+ nu nubar excess but not both simultaneously.
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Probing vector- vs scalar-mediator dark-matter scenarios in $B\to (K,K^*) M_X$ decays
Scalar and vector dark-matter mediator scenarios in B decays are distinguishable via differential distributions, with data imposing M_V ≲ 3 GeV for vectors but no mass bound for scalars.
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