Inelastic fermion dark matter origin of XENON1T excess with muon (g − 2) and light neutrino mass

The excess of electron recoil events seen by the XENON1T experiment has been interpreted as a potential signal of axion-like particles (ALPs), either produced in the Sun, or constituting part of the dark matter halo of the Milky Way. It has also been explained as a consequence of trace amounts of tritium in the experiment. We consider the evidence for the solar and dark-matter ALP hypotheses from the combination of XENON1T data and multiple astrophysical probes, including horizontal branch stars, red giants, and white dwarfs. We briefly address the influence of ALP decays and supernova cooling. While the different datasets are in clear tension for the case of solar ALPs, all measurements can be simultaneously accommodated for the case of a sub-dominant fraction of dark-matter ALPs. Nevertheless, this solution requires the tuning of several a priori unknown parameters, such that for our choices of priors a Bayesian analysis shows no strong preference for the ALP interpretation of the XENON1T excess over the background hypothesis.

Section: Jhep05(2021)159 1 Introductionmentioning

confidence: 99%

Global fits of axion-like particles to XENON1T and astrophysical data

Athron

Balázs

Beniwal

et al. 2021

“…In order to avoid large corrections to neutrino masses induced by large neutrino magnetic moments, some new symmetries can be introduced [21,26]. Moreover, there are many theoretical attempts to interpret the XENON1T signal assuming new physics beyond the SM such as, boosted dark matter [27][28][29][30][31][32], dark radiation [33,34], anomalous magnetic moment of muon [23,35], inelastic DM-electron scattering [36][37][38][39][40][41], axion-like DM [10,42]. Besides, there are some proposals using a gauged U (1) X extention of the SM, where a gauge boson Z contributes to dark matter (DM) [43][44][45][46][47][48][49][50][51].…”

Section: Jhep12(2020)194mentioning

confidence: 99%

Shedding new light on sterile neutrinos from XENON1T experiment

Shakeri

Hajkarim

Xue

2020

The XENON1T collaboration recently reported the excess of events from recoil electrons, possibly giving an insight into new area beyond the Standard Model (SM) of particle physics. We try to explain this excess by considering effective interactions between the sterile neutrinos and the SM particles. In this paper, we present an effective model based on one-particle-irreducible interaction vertices at low energies that are induced from the SM gauge symmetric four-fermion operators at high energies. The effective interaction strength is constrained by the SM precision measurements, astrophysical and cosmological observations. We introduce a novel effective electromagnetic interaction between sterile neutrinos and SM neutrinos, which can successfully explain the XENON1T event rate through inelastic scattering of the sterile neutrino dark matter from Xenon electrons. We find that sterile neutrinos with masses around 90 keV and specific effective coupling can fit well with the XENON1T data where the best fit points preserving DM constraints and possibly describe the anomalies in other experiments.

“…Pseudo-Dirac fermion dark matter [6] or complex scalar dark matter [7] with a dark U(1) symmetry have been proposed to explain the XENON1T excess. In these scenarios for exothermic dark matter, it is common to take dark matter and mediator particles to be light below GeV scale [8][9][10][11][12], belonging to the category that has been of growing interest in recent years as alternatives to WIMP dark matter.…”

Section: Introductionmentioning

confidence: 99%

Exothermic dark mesons in light of electron recoil excess at XENON1T

Choi

Lee

Zhu

2021

We consider a novel mechanism to realize exothermic dark matter with dark mesons in the limit of approximate flavor symmetry in a dark QCD. We introduce a local dark U(1)′ symmetry to communicate between dark mesons and the Standard Model via Z′ portal by partially gauging the dark flavor symmetry with flavor-dependent charges for cancelling chiral anomalies in the dark sector. After the dark local U(1)′ is broken spontaneously by the VEV of a dark Higgs, there appear small mass splittings between dark quarks, consequently, leading to small split masses for dark mesons, required to explain the electron recoil excess in XENON1T by the inelastic scattering between dark mesons and electron. We propose a concrete benchmark model for split dark mesons based on SU(3)L× SU(3)R/SU(3)V flavor symmetry and SU(Nc) color group and show that there exists a parameter space making a better fit to the XENON1T data with two correlated peaks from exothermic processes and satisfying the correct relic density, current experimental and theoretical constraints.