Constraints on electron-scattering interpretation of XENON1T excess

Abstract

Recently, the XENON1T experiment has observed an excess in the electronic recoil data in the recoil energy range of 1-7 keV. One of the most favored new physics interpretations is electron scattering with a boosted particle with a velocity of ∼ 0.1 and a mass of 0.1 MeV. If such a particle has a strong interaction with electrons, it may affect the standard scenario of cosmology or be observed at low-threshold direct detection experiments. We study various constraints, mainly focusing on those from the big-bang nucleosynthesis, supernova cooling, and direct detection experiments. We discuss the implication of these constraints on electron-scattering interpretation of the XENON1T excess.

Boosted Neutrinos and Relativistic Dark Particles as Messengers from Reheating

“…We note that our conclusion differs from that of Ref. [138], because of the different energy dependence of the cross-sections. The light mediator, φ in our model, makes various cross sections smaller, and thus constraints weaker at higher energy scales.…”

“…Slightly above this temperature the annihilation rate is Γ MeV ∼ σ MeV T 3 /π 2 . This should be smaller than the Hubble expansion rate to have consistent BBN [137,138]. This requires As we can see at MeV energies the bound is much stricter than the one obtained for the cross section today.…”

Pico-charged particles explaining 511 keV line and XENON1T signal

“…The shape of the electron recoil spectrum cannot be explained by the vanilla WIMP dark matter scattering as the recoil energy off the electrons will be smaller than 1 eV and below the detection threshold. However, boosted dark matter may be able to account for the observed excess [12]; see, however, [15]. Another possibility is down-scattering of inelastic dark matter with a splitting of few keV [13].…”

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).…”