How to rule out (g-2)_μ in U(1)_L_μ-L_τ with White Dwarf Cooling
arxiv(2024)
摘要
In recent years, the gauge group U(1)_L_μ-L_τ has received a lot of
attention since it can, in principle, account for the observed excess in the
anomalous muon magnetic moment (g-2)_μ, as well as the Hubble tension. Due
to unavoidable, loop-induced kinetic mixing with the SM photon and Z, the
U(1)_L_μ-L_τ gauge boson A' can contribute to stellar cooling via
decays into neutrinos. In this work, we perform for the first time an
ab initio computation of the neutrino emissivities of white dwarf
stars due to plasmon decay in a model of gauged U(1)_L_μ-L_τ. Our
central finding is that an observation of the early-stage white dwarf neutrino
luminosity at the 30
allowed parameter space for explaining (g-2)_μ. In this work, we present
the relevant white dwarf sensitivities over the entire A' mass range. In
particular, we have performed a rigorous computation of the luminosities in the
resonant regime, where the A' mass is comparable to the white dwarf plasma
frequencies.
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