Direct Detection of Spin-Dependent Sub-GeV Dark Matter via Migdal Effect

Wang, Wenyu; Wu, Ke-Yun; Wu, Lei; Zhu, Bin

doi:10.48550/arxiv.2112.06492

Cited by 6 publications

(6 citation statements)

References 66 publications

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“…There are several ways of improving the detection of light DM. For nuclear recoil, the detection threshold can be lowered by using Germanium point-contact detector [18], bolometer [19,20], nuclear bremsstrahlung [21,22], and Migdal effect [22][23][24][25][26][27][28][29][30][31][32][33]. Or one may replace the nuclear recoil by electron recoil.…”

Section: Jhep05(2022)191mentioning

confidence: 99%

Revisiting the fermionic dark matter absorption on electron target

et al. 2022

J. High Energ. Phys.

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We perform a systematic study of the fermionic DM absorption interactions on electron target in the context of effective field theory. The fermionic DM absorption is not just sensitive to sub-MeV DM with efficient energy release, but also gives a unique signature with clear peak in the electron recoil spectrum whose shape is largely determined by the atomic effects. Fitting with the Xenon1T and PandaX-II data prefers DM mass at mχ = 59 keV and 105 keV, respectively, while the cut-off scale is probed up to around 1 TeV. The DM overproduction in the early Universe, the invisible decay effect on the cosmological evolution, and the visible decay signal collected by the astrophysical X(gamma)-ray observations (Insight-HXMT, NuSTAR, HEAO-1, and INTEGRAL) are thoroughly explored to constrain the DM absorption interactions. With stringent bounds on the tensor and pseudo-scalar operators, the other fermionic DM operators are of particular interest at tonne-scale direct detection experiments such as PandaX-4T, XENONnT, and LZ.

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Section: Jhep05(2022)191mentioning

confidence: 99%

Revisiting the fermionic dark matter absorption on electron target

et al. 2022

J. High Energ. Phys.

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Section: Introductionmentioning

confidence: 99%

Revisiting the Fermionic Dark Matter Absorption on Electron Target

Ge,

He,

et al. 2022

Preprint

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We perform a systematic study of the fermionic DM absorption interactions on electron target in the context of effective field theory. The fermionic DM absorption is not just sensitive to sub-MeV DM with efficient energy release, but also gives a unique signature with clear peak in the electron recoil spectrum whose shape is largely determined by the atomic effects. Fitting with the Xenon1T and PandaX-II data prefers DM mass at m χ = 59 keV and 105 keV, respectively, while the cut-off scale is probed up to around 1 TeV. The DM overproduction in the early Universe, the invisible decay effect on the cosmological evolution, and the astrophysical X(gamma)-ray from the DM visible decays are thoroughly explored to give up-to-date constraints. With stringent bounds on the tensor and pseudo-scalar operators, the other fermionic DM operators are of particular interest at tonne-scale direct detection experiments such as PandaX-4T, XENONnT, and LZ.

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“…Then the ionized electrons drift into the gaseous xenon layer at the top of the detector in presence of an external electric field, which produces a proportional scintillation light, namely the S2 signal. In the theoretical studies, such ionization signals can come from the DM-electron scattering [6][7][8][9][10][11][12][13][14][15][16][17] or the DM-nucleus scattering through the Migdal effect that originates from the non-instantaneous movement of electron cloud during a nuclear recoil event [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Can sub-GeV dark matter coherently scatter on the electrons in the atom?

Guo¹,

Sun²,

Wang³

et al. 2022

Commun. Theor. Phys.

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A novel detection of sub-GeV dark matter is proposed in the paper. The electron cloud is boosted by the dark matter and emits an electron when it is dragged back by the heavy nucleus, namely the coherent scattering of the electron cloud of the atom. The survey in the X-ray diffraction shows that the atomic form factors are much more complicate than the naive consideration. The results of the relativistic Hartree-Fock(RHF) method give non-trivial shapes of the atoms. The detailed calculation of the recoil of the electron cloud, the kinetics, the fiducial cross section and the corresponding calculation of detection rate are given analytically. The numerical results show that the limits of the RHF form factors are much stringent than the recoil of a single electron, almost 4 orders stronger, and also gives tight limitations comparing to the Migdal effect below about several hundred MeV. The physical picture and the corresponding results are promising and need further explorations.

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Direct Detection of Spin-Dependent Sub-GeV Dark Matter via Migdal Effect

Cited by 6 publications

References 66 publications

Revisiting the fermionic dark matter absorption on electron target

Revisiting the fermionic dark matter absorption on electron target

Revisiting the Fermionic Dark Matter Absorption on Electron Target

Can sub-GeV dark matter coherently scatter on the electrons in the atom?

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