Kavli Affiliate: Gordan Krnjaic
| First 5 Authors: Gordan Krnjaic, , , ,
| Summary:
In light of recent DAMIC-M results, we present the status of thermal-relic
dark matter $chi$ coupled to a kinetically-mixed dark photon $A^prime$. In
the predictive "direct annihilation" regime, $m_{A’} > m_chi$, the relic
abundance depends on the kinetic mixing parameter, and there is a minimum value
compatible with thermal freeze out. Using only electron and nuclear recoil
direct detection results, we find that for complex scalar dark matter, the
direct-annihilation regime is now excluded for nearly all values of $m_chi$;
the only exception is the resonant annihilation regime where $m_{A’}approx 2
m_chi$. Direct annihilation relic targets for other representative models,
including Majorana and Pseudo-Dirac candidates, remain viable across a wide
range of model parameters, but will be tested with a combination of dedicated
accelerator searches in the near future. In the opposite "secluded
annihilation" regime, where $m_chi > m_{A’}$, this scenario is excluded by
cosmic microwave background measurements for all $m_chi lesssim 30$ GeV.
Similar conclusions in both the direct and secluded regimes hold for all
anomaly-free vector mediators that couple to the first generation of
electrically-charged Standard Model particles.
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