Kavli Affiliate: Jia Liu
| First 5 Authors: Jinhui Guo, Yuxuan He, Jia Liu, Xiao-Ping Wang, Ke-Pan Xie
| Summary:
A new particle usually manifests itself as a single resonant peak located at
its mass. We propose if the new particle mass is time-varying due to
environmental effects, then its mass spectrum typically has a novel double-peak
feature. A representative model is the kinetic mixing dark photon interacting
with an ultralight complex scalar dark matter charged under $U(1)’$. We
reanalyze the existing experiments, showing the constraints on such a model are
drastically weakened than those on the traditional single-peak resonance model,
due to the reduction of the luminosity exposure in each resonant mass bin.
Consequently, for mass around tens of MeV, the muon $g_mu$–$2$ solution from
the kinetic mixing dark photon becomes viable again. The scenario can be
further tested by reanalyzing the existing data with timing information
included.
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