摘要
Neutrino-electron scattering experiments can explore the potential presence of a light gauge bosonA'which arises from an additionalU(1)_(B-L)group, or a dark photonA'which arises from a dark sector and has kinetic mixing with the SM hypercharge gauge field. We generically call it a dark photon. In this study, we investigate the effect of the dark photon on neutrino-electron scatteringν e⁻→ν e⁻at the newly proposed forward physics experiments such as FASER ν , FASER ν2 , SND@LHC and FLArE(10 tons). We estimate the anticipated sensitivities to theU(1)_(B-L)gauge coupling in a wide range of the dark photon massM_(A') . We compare the sensitivities of the proposed forward physics experiments with the current limits from TEXONO, GEMMA, BOREXINO, LSND, and CHARM II as well as NA64e experiments. We also extend the calculation to obtain the sensitivities on the kinetic mixing parameter∊in a wide range of dark photon massM_(A') . We demonstrate that the sensitivities do not improve forM_(A') < 1 GeV at the Forward Physics Facilities.