Excess electronic recoil events in XENON1T

Aprile, E.; Aalbers, J.; Agostini, F.; Alfonsi, M.; Althueser, L.; Amaro, F. D.; Antochi, V. C.; Angelino, E.; Angevaare, J. R.; Arneodo, F.; Barge, D.; Baudis, L.; Bauermeister, B.; Bellagamba, L.; Benabderrahmane, M. L.; Berger, T.; Brown, A.; Brown, E.; Bruenner, S.; Bruno, G.; Budnik, R.; Capelli, C.; Cardoso, J. M. R.; Cichon, D.; Cimmino, B.; Clark, Michael; Coderre, D.; Colijn, A. P.; Conrad, J.; Cussonneau, J. P.; Decowski, M. P.; Depoian, A.; Gangi, P. Di; Giovanni, A. Di; Stefano, R. Di; Diglio, S.; Elykov, A.; Eurin, G.; Ferella, A. D.; Fulgione, W.; Gaemers, P.; Gaïor, R.; Galloway, M.; Gao, F.; Grandi, L.; Hasterok, C.; Hils, C.; Hiraide, K.; Hoetzsch, L.; Howlett, J.; Iacovacci, M.; Itow, Y.; Joerg, F.; Kato, Natsuko; Kazama, S.; Kobayashi, Masaaki; Koltman, G.; Kopec, A.; Landsman, H.; Lang, R. F.; Levinson, L. J.; Lin, Q.; Lindemann, Stefan; Lindner, M.; Lombardi, F.; Long, Jianyu; Lopes, J. A. M.; Fune, E. López; Macolino, C.; Mahlstedt, J.; Mancuso, Adrian P.; Manenti, L.; Manfredini, A.; Marignetti, Fabrizio; Undagoitia, T. Marrodán; Martens, K.; Masbou, J.; Masson, D.; Mastroianni, S.; Messina, M.; Miuchi, K.; Mizukoshi, K.; Molinario, A.; Morå, K.; Moriyama, S.; Mosbacher, Y.; Murra, M.; Naganoma, J.; Ni, K.; Oberlack, U.; Odgers, K.; Palacio, J.; Pelssers, B.; Peres, R.; Pienaar, J.; Pizzella, V.; Plante, G.; Qin, J.; Qiu, H.; García, D. Ramírez; Reichard, S.; Rocchetti, A.; Rupp, N.; Santos, J. M. F. dos; Sartorelli, G.; Šarčević, N.; Scheibelhut, M.; Schreiner, J.; Schulte, D.; Schümann, M.; Lavina, L. Scotto; Selvi, M.; Semeria, F.; Shagin, P.; Shockley, E.; Silva, Miguel; Simgen, H.; Takeda, Atsushi; Therreau, C.; Thers, D.; Toschi, F.; Trinchero, G.; Tunnell, Christopher; Vargas, M.; Volta, G.; Wang, H.; Wei, Y.; Weinheimer, C.; Weiss, Matthew J.; Wenz, D.; Wittweg, C.; Xu, Z.; Yamashita, M.; Ye, J.; Zavattini, G.; Zhang, Y.; Zhu, T.; Zopounidis, J. P.; Mougeot, X.

doi:10.1103/physrevd.102.072004

Cited by 550 publications

(784 citation statements)

References 164 publications

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“…Recently XENON1T has reported an excess in just such a region [8]. While this excess most likely has it's origins in more mundane effects, it is interesting to speculate if it could be the harbinger of a DM discovery.…”

Section: Jhep11(2020)120mentioning

confidence: 96%

“…Even if the background rate were only poorly understood, we find that an undulating contribution to the signal can be constrained several orders of magnitude better than a constant contribution, for a reasonably wide window of frequencies. 1 This strategy could boost discovery potential in high background search regions, such as the single-electron event bins of the upcoming SENSEI [2][3][4] and SuperCDMS experiments [5,6], and the electronic recoil mode of the XENON1T experiment [7] (in which an excess of events has recently been observed [8]).…”

Section: Jhep11(2020)120mentioning

confidence: 99%

“…[22], where α is the fine-structure constant and µ χe is the reduced mass between the electron and χ. 8 The data from the 1e − bin is significantly less constraining than the multi-electron bins because the background rate is high, with the ≥ 3e − bin being essentially background-free. On the other hand, due to kinematic thresholds, the multi-electron bins lose sensitivity for dark matter masses lighter than 1 MeV or so.…”

Section: Detecting Undulating Dark Mattermentioning

confidence: 99%

“…Other reasonable models give no bounds on the DM EDM[37,38] 7. At the time of writing, these constraints are currently world-leading for DM masses mχ ∈ [0.6, 5] MeV, as well as in the low mass window mχ ∈ [1.2, 12.8] eV 8. For these calculations we assume the local dark matter density is ρ DM = 0.3GeV/cm 3 , the dark matter escape velocity is 600 km/s, the mean local velocity of dark matter is 230 km/s and the average Earth velocity is 240 km/s.…”

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confidence: 99%

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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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Section: Jhep11(2020)120mentioning

confidence: 96%

Section: Jhep11(2020)120mentioning

confidence: 99%

Section: Detecting Undulating Dark Mattermentioning

confidence: 99%

mentioning

confidence: 99%

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Undulating dark matter

Davighi

McCullough

Tooby-Smith

2020

J. High Energ. Phys.

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“…Quite recently, a tantalizing hint has been announced for the potential dark matter signals from the electron recoil events in the recoil energy, E R = 1 − 10 keV, from XENON1T experiment [1]. The origin of the Xenon excess has attracted interest from several groups [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Exothermic dark matter for XENON1T excess

Lee

2021

J. High Energ. Phys.

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Motivated by the recent excess in the electron recoil from XENON1T experiment, we consider the possibility of exothermic dark matter, which is composed of two states with mass splitting. The heavier state down-scatters off the electron into the lighter state, making an appropriate recoil energy required for the Xenon excess even for the standard Maxwellian velocity distribution of dark matter. Accordingly, we determine the mass difference between two component states of dark matter to the peak electron recoil energy at about 2.5 keV up to the detector resolution, accounting for the recoil events over ER = 2 − 3 keV, which are most significant. We include the effects of the phase-space enhancement and the atomic excitation factor to calculate the required scattering cross section for the Xenon excess. We discuss the implications of dark matter interactions in the effective theory for exothermic dark matter and a massive Z′ mediator and provide microscopic models realizing the required dark matter and electron couplings to Z′.

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Search for dark photons in heavy‐ion collisions

et al. 2022

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The vector U‐bosons, or so‐called “dark photons,” are one of the possible candidates for the dark matter mediators. They are supposed to interact with the standard matter via a “vector portal” due to the U(1)−Ufalse(1false)′$$ U(1)-U{(1)}^{\prime } $$ symmetry group mixing which might make them visible in particle and heavy‐ion experiments. While there is no confirmed observation of dark photons, the detailed analysis of different experimental data allows us to estimate the upper limit for the kinetic mixing parameter ϵ2$$ {\epsilon}^2 $$ depending on the mass MU$$ {M}_U $$ of U‐bosons which is also unknown. We have introduced a procedure to define theoretical constraints on the upper limit of ϵ2()MU$$ {\epsilon}^2\left({M}_U\right) $$ from heavy‐ion (as well as p + p and p+A$$ p+A $$) dilepton data. Our analysis is based on the microscopic Parton‐Hadron‐String Dynamics transport approach where we incorporated the decay of hypothetical U‐bosons to dileptons, U→e+e−$$ U\to {e}^{+}{e}^{-} $$, where the U‐bosons themselves are produced by the Dalitz decay of pions π0→γU$$ {\pi}^0\to \gamma U $$, η‐mesons η→γU$$ \eta \to \gamma U $$, and Delta resonances normalΔ→italicNU$$ \Delta \to NU $$. The extension of our procedure to other dark matter candidates is foreseen.

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Excess electronic recoil events in XENON1T

Cited by 550 publications

References 164 publications

Undulating dark matter

Undulating dark matter

Exothermic dark matter for XENON1T excess

Search for dark photons in heavy‐ion collisions

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