High Energy Physics - Phenomenology
[Submitted on 30 Apr 2024]
Title:How to rule out $(g-2)_μ$ in $U(1)_{L_μ-L_τ}$ with White Dwarf Cooling
View PDF HTML (experimental)Abstract:In recent years, the gauge group $U(1)_{L_\mu-L_\tau}$ has received a lot of attention since it can, in principle, account for the observed excess in the anomalous muon magnetic moment $(g-2)_\mu$, as well as the Hubble tension. Due to unavoidable, loop-induced kinetic mixing with the SM photon and $Z$, the $U(1)_{L_\mu-L_\tau}$ gauge boson $A'$ can contribute to stellar cooling via decays into neutrinos. In this work, we perform for the first time an \textit{ab initio} computation of the neutrino emissivities of white dwarf stars due to plasmon decay in a model of gauged $U(1)_{L_\mu-L_\tau}$. Our central finding is that an observation of the early-stage white dwarf neutrino luminosity at the 30% level could exclude (or partially exclude) the remaining allowed parameter space for explaining $(g-2)_\mu$. 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.
Submission history
From: Jaime Hoefken Zink [view email][v1] Tue, 30 Apr 2024 18:00:01 UTC (102 KB)
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