Inelastic dark matter electron scattering and the XENON1T excess

Harigaya, Keisuke; Nakai, Yuichiro; Suzuki, Motoo

doi:10.1016/j.physletb.2020.135729

Cited by 71 publications

(54 citation statements)

References 37 publications

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“…However, this difference in the recoil spectra should not be noticeable in practice, since the recoil energy spectra are appreciably smeared by the detector resolution as given by Eq. (15). We see from the upper panel of Fig.…”

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confidence: 81%

Electric But Not Eclectic: Thermal Relic Dark Matter for the XENON1T Excess

Bramante

Song

2020

Phys. Rev. Lett.

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The identity of dark matter is being sought with increasingly sensitive and voluminous underground detectors. Recently the XENON1T Collaboration reported excess electronic recoil events, with most of these having recoil energies around 1-30 keV. We show that a straightforward model of inelastic dark matter produced via early Universe thermal freeze-out annihilation can account for the XENON1T excess. Remarkably, this dark matter model consists of a few simple elements: sub-GeV mass Dirac fermion dark matter coupled to a lighter dark photon kinetically mixed with the standard model photon. A scalar field charged under the dark U(1) gauge symmetry can provide a mass for the dark photon and splits the Dirac fermion component state masses by a few keV, which survive in equal abundance and interact inelastically with electrons and nuclei.

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confidence: 81%

Electric But Not Eclectic: Thermal Relic Dark Matter for the XENON1T Excess

Bramante

Song

2020

Phys. Rev. Lett.

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“…It should be noted that scenarios for explaining the XENON1T excess mentioned above are by no means exhaus-tive, see Refs. [20][21][22][23][24] for other possible interpretations of the electron recoil excess.…”

Section: Introductionmentioning

confidence: 99%

Collider constraints on a dark matter interpretation of the XENON1T excess

2020

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In light of the excess in the low-energy electron recoil events reported by XENON1T, many new physics scenarios have been proposed as a possible origin of the excess. One possible explanation is that the excess is a result of a fast moving dark matter (DM), with velocity $$v\sim $$ v ∼ 0.05–0.20 and mass between 1 MeV and 10 GeV, scattering off an electron. Assuming the fast moving DM-electron interaction is mediated by a vector particle, we derive collider constraints on the said DM-electron interaction. The bounds on DM-electron coupling is then used to constrain possible production mechanisms of the fast moving DM. We find that the preferred mass of the vector mediator is relatively light ($$\lesssim $$ ≲ 1 GeV) and the coupling of the vector to the electron is much smaller than the coupling to the fast moving DM.

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“…For DM scattering, rather than absorption, vanilla scenarios are disfavoured due to the observed energy spectrum of the excess. However, exotic DM distribution subcomponents with high velocity components [51][52][53][53][54][55][56][57], exothermic DM scattering [58][59][60][61][62][63][64], or scattering which produces photons [65,66], can provide possible DM scattering explanations. In these cases, if the DM coupling undulates then, irrespective of kinematic details, the scattering rate will undulate, although at present with low statistics the events are consistent with both constant and annual modulations.…”

Section: Jhep11(2020)120mentioning

confidence: 99%

Undulating dark matter

Davighi

McCullough

Tooby-Smith

2020

J. High Energ. Phys.

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We suggest that an interplay between microscopic and macroscopic physics can give rise to dark matter (DM) whose interactions with the visible sector fundamentally undulate in time, independent of celestial dynamics. A concrete example is provided by fermionic DM with an electric dipole moment (EDM) sourced by an oscillating axion-like field, resulting in undulations in the scattering rate. The discovery potential of light DM searches can be enhanced by additionally searching for undulating scattering rates, especially in detection regions where background rates are large and difficult to estimate, such as for DM masses in the vicinity of 1 MeV where DM-electron scattering dominantly populates the single electron bin. An undulating signal could also reveal precious dark sector information after discovery. In this regard we emphasise that, if the recent XENON1T excess of events is due to light DM scattering exothermically off electrons, future analyses of the time-dependence of events could offer clues as to the microscopic origins of the putative signal.

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Inelastic dark matter electron scattering and the XENON1T excess

Cited by 71 publications

References 37 publications

Electric But Not Eclectic: Thermal Relic Dark Matter for the XENON1T Excess

Electric But Not Eclectic: Thermal Relic Dark Matter for the XENON1T Excess

Collider constraints on a dark matter interpretation of the XENON1T excess

Undulating dark matter

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