2021
DOI: 10.1007/jhep04(2021)251
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Exothermic dark mesons in light of electron recoil excess at XENON1T

Abstract: 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,… Show more

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Cited by 15 publications
(15 citation statements)
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“…As we know, the FCNC interactions in visible sectors are already suffered from severe constraints and make them become rare processes [57]. It would be interesting to explore the situation for the DFCNC interactions [58][59][60][61]. We found these DFCNC interactions can generate novel signatures at collider and fixed target experiments which cannot be produced from single-component DM or inelastic DM models with U (1) X dark gauge symmetry.…”
Section: Introductionmentioning
confidence: 90%
“…As we know, the FCNC interactions in visible sectors are already suffered from severe constraints and make them become rare processes [57]. It would be interesting to explore the situation for the DFCNC interactions [58][59][60][61]. We found these DFCNC interactions can generate novel signatures at collider and fixed target experiments which cannot be produced from single-component DM or inelastic DM models with U (1) X dark gauge symmetry.…”
Section: Introductionmentioning
confidence: 90%
“…There are interesting signals from multi-component dark matter for direct detection experiments, depending on the mass differences between dark matter components [45][46][47][48][49]. Since the φ 1 dark matter particle in our model appearing from the semi-annihilation is boosted, it could lead to a new signature for direct detection experiments once φ 1 is produced at the galactic center and it scatters strongly with the target material via nucleon or electron interactions.…”
Section: Direct Detection For Self-resonant Dark Mattermentioning
confidence: 97%
“…). Then, depending on the interactions between the φ 1 particle and the SM, there is an interesting boosted signal in direct detection experiments such as XENON1T [45][46][47][48][49][50].…”
Section: Direct Detection For Self-resonant Dark Mattermentioning
confidence: 99%
See 1 more Smart Citation
“…Then the ionized electrons drift into the Gaseous Xenon layer at the top of the detector in presence of an external electric field, and then collide with the xenon atoms, which produces a proportional scintillation light, namely the S2 signal. In theory, such ionization signals can come from the DM-electron scattering [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] or the DM-nucleus scattering through the Migdal effect that originates from non-instantaneous movement of electron cloud during a nuclear recoil event [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. The Migdal scattering is usually sub-dominant to the conventional nuclear scattering, but can take place in a very low energy nuclear recoil, which has been used to improve the sensitivity of the DM-nucleus interactions in the low DM mass region [40][41][42].…”
Section: Introductionmentioning
confidence: 99%