论文标题
鉴于Xenon1t的过量
Cosmological Constraint on Vector Mediator of Neutrino-Electron Interaction in light of XENON1T Excess
论文作者
论文摘要
最近，Xenon1T协作报告了电子后坐力能量谱的过量。最简单的新物理解释之一是由光矢量粒子介导的一种新的中性电子相互作用。但是，对于因这种过量而偏爱的参数区域，恒星冷却的约束很严重。尽管如此，这些限制仍然存在天体物理不确定性。在本文中，我们讨论了CMB时代有效数量中微子NEFF数量的光中微子NEFF的限制，该中微子NEFF提供了独立的约束。我们表明，NEFF显着增强，并超过了对异种1T过量的参数区域的当前约束。结果，NEFF约束排除了比大约1 eV的光中介器的解释。
Recently, the XENON1T collaboration reported an excess in the electron recoil energy spectrum. One of the simplest new physics interpretation is a new neutrino-electron interaction mediated by a light vector particle. However, for the parameter region favored by this excess, the constraints from the stellar cooling are severe. Still, there are astrophysical uncertainties on those constraints. In this paper, we discuss the constraint on the light mediator from the effective number of neutrino Neff in the CMB era, which provides an independent constraint. We show that Neff is significantly enhanced and exceeds the current constraint in the parameter region favored for the XENON1T excess. As a result, the interpretation by a light mediator heavier than about 1 eV is excluded by the Neff constraint.
