2023/09/10 by Jiale Li, Wei Liu, Li, Jiale +3 · 1 citation
Physics and Astronomy · Engineering · #Particle physics theoretical and experimental studies #High-Energy Particle Collisions Research #Particle accelerators and beam dynamics
paper · pdf · doi:10.48550/arxiv.2309.05020
We investigate the pair production of right-handed neutrinos mediated by a Z^′ mainly from the meson decays at the FASER detector of the HL-LHC. The Z^′ can be the additional gauge boson in either the U(1)B-L or sterile ν-specific U(1)s model. Taking the gauge coupling or the kinetic mixing at the current limits, we analyse the sensitivity to the masses of the heavy neutrinos, MN, and active-sterile mixing, |VlN|2, of the FASER2. In a background free scenario, for the U(1)B-L case, FASER2 is able to probe |VlN|2 ≈ 10-8 when MN ∼ 0.3 GeV, which is comparable to the current limits from the beam dump experiments. When comes to the U(1)s model, FASER2 can probe |VlN|2 ≈ 10-10, which is better than the current limits for at least one magnitude, in all three flavours. A proposed long-lived particle detector, FACET, is also studied, while no significant difference from FASER2 is derived.