In a U(1)_{B-L} model with a Dirac singlet dark matter fermion, relic abundance constraints fix combinations of the dark matter and gauge couplings, and freeze-in scenarios leave parameter space that FASER, Belle II, SHiP, and LDMX can probe.
Since the annihilation process occurs via s-wave, we can approx- imate ⟨σv ⟩ as σv in the non-relativistic limit
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Dark Matter Constraints on Low Mass and Weakly Coupled B-L Gauge Boson
In a U(1)_{B-L} model with a Dirac singlet dark matter fermion, relic abundance constraints fix combinations of the dark matter and gauge couplings, and freeze-in scenarios leave parameter space that FASER, Belle II, SHiP, and LDMX can probe.