Sensitivities to secret neutrino interaction at FASER <i>ν</i>
Majid Bahraminasr, Pouya Bakhti, Meshkat Rajaee
Abstract
Abstract We study the impact of the coupling of neutrinos with a new light neutral gauge boson, Z ′, with a mass of less than 500 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 ′, ( M + → l + νZ ′), followed by the subsequent decay of Z ′ into the pair of neutrino and anti-neutrino, ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:msup> <mml:mrow> <mml:mi>Z</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>′</mml:mo> </mml:mrow> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>ν</mml:mi> <mml:mrow> <mml:mover accent="true"> <mml:mrow> <mml:mi>ν</mml:mi> </mml:mrow> <mml:mo>¯</mml:mo> </mml:mover> </mml:mrow> </mml:math> ). FASER ν , the Forward Search Experiment at the Large Hadron Collider, 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.