Solar Neutrino Scattering with Electron into Massive Sterile Neutrino

Abstract

The recent Xenon1T excess can be explained by solar neutrino scattering with electron via a light mediator, either scalar or vector, in addition to many other explanations from the dark sector. Since only the recoil electron is observable, a keV sterile neutrino instead of an active neutrino can appear in the final state. The sterile neutrino allows pseudoscalar mediator to explain the Xenon1T excess which was thought impossible. In addition, nonzero recoil energy lower bound arises from the sterile neutrino mass, which can be used to testify if the sterile neutrino is massive or not. We also briefly discuss the case of sterile neutrino final state with light Z mediator.

Anomaly-free leptophilic axionlike particle and its flavor violating tests

“…Recently, the Xenon collaboration reported the observation of an excess in the electron recoiling energy around the keV scale in the Xenon1T detector [1]. Shortly after its announcement, a lot of theoretical work has been done to interpret the results in the context of axion-like particles (ALPs) [2][3][4][5][6][7][8][9][10], dark matter , neutrinos [36][37][38][39][40][41][42][43][44][45] and solar axions [46][47][48], which, however, are subject to stringent constraints from stellar cooling [49][50][51]. In this work we focus on the ALP framework.…”

Explaining The XENON1T Excess With Light Goldstini Dark Matter

“…Many alternative ideas had been proposed to explain the XENON1T excess, including the non-standard neutrino-electron interactions with light mediators [2][3][4][5][6][7][8][9][10][11][12][13][14], absorption of axion or dark photon theories , the scattering of dark matter candidates with electron [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56], and the other mechansims [57][58][59][60][61][62][63][64]. We emphasize that explanations from cosmic dark matter with their new features may shed new light on possible new physics beyond the Standard Model(SM), including the low energy supersymmetry(SUSY).…”

XENON1T constraints on neutrino non-standard interactions

“…Numerous attempts to interpret this excess have been made in the context of dark matter , axion-like particles (ALPs) [31][32][33][34][35][36][37][38][39], solar axions [40][41][42], etc. These experiments are also sensitive to the background from neutrino-electron scattering within the detector [43][44][45][46][47][48]. Such background can originate from solar [49], atmospheric [49], supernova [50], or even reactor neutrinos [51].…”