Sensitivities to secret neutrino interaction at FASER$ν$
英文摘要：
We study the impact of the coupling of neutrinos with a new light neutral gauge boson, $Z^\prime$, with a mass of less than 500 {\rm MeV} in FASER$ν$ experiment. Scenarios in which a light gauge boson is coupled to neutrinos are motivated within numerous contexts which are designed to explain various anomalies in particle physics and cosmology. This interaction leads to a new decay mode for charged mesons to a light lepton plus neutrino and $Z^{\prime}$, ($π^+(K^+)\to e^+ νZ^\prime$) followed by the subsequent decay of $Z^\prime$ into the pair of neutrino and anti-neutrino, ($Z^\prime \to ν\barν$). FASER$ν$, the Forward Search Experiment at the LHC, has the potential to detect collider neutrinos for the first time. In particular, the FASER$ν$ emulsion detector will provide the opportunity to detect $τ$-neutrinos and to measure their energies. Using this ability of FASER$ν$ emulsion detector, we investigate the potential of FASER$ν$ experiment and the proposed upgraded version of this experiment, FASER2$ν$, to constrain the coupling of a neutrino with the light gauge boson.
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