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Fakultät Physik

Flavor Phenomenology of Light Dark Vectors

  • Stamou
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Light dark matter with flavor-violating couplings to fermions may be copiously produced in the
laboratory as missing energy from decays of SM particles. Here we study the effective Lagrangian
of a light dark vector with generic dipole or vector couplings. We calculate the resulting two-body
decay rates of mesons, baryons and leptons as a function of the dark vector mass and show that
existing experimental limits probe UV scales as large as 1012 GeV. We also derive the general RGEs
in order to constrain the flavor-universal UV scenario, where all flavor violation arises radiatively
proportional to the CKM matrix.

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