Cosmology with a very light Lμ − Lτ gauge boson
Cosmology with a very light Lμ − Lτ gauge boson
In this paper, we explore in detail the cosmological implications of an abelian $L_\mu-L_\tau$ gauge extension of the Standard Model featuring a light and weakly coupled $Z'$. Such a scenario is motivated by the longstanding $\sim \, 4 \sigma$ discrepancy between the measured and predicted values of the muon's anomalous …