Light dark matter search with ionization signals in XENON1T

Aprile, E.; Aalbers, J.; Agostini, F.; Alfonsi, M.; Althueser, L.; Amaro, F. D.; Antochi, V. C.; Angelino, E.; Arneodo, F.; Barge, D.; Baudis, L.; Bauermeister, B.; Bellagamba, L.; Benabderrahmane, M. L.; Berger, T.; Breur, P. A.; Brown, A.; Brown, E.; Bruenner, S.; Bruno, G.; Budnik, R.; Capelli, C.; Cardoso, J. M. R.; Cichon, D.; Coderre, D.; Colijn, A. P.; Conrad, J.; Cussonneau, J. P.; Decowski, M. P.; De Perio, P.; Depoian, A.; Di Gangi, P.; Di Giovanni, A.; Diglio, S.; Elykov, A.; Eurin, G.; Fei, J.; Ferella, A. D.; Fieguth, A.; Fulgione, W.; Gaemers, P.; Gallo Rosso, A.; Galloway, M.; Gao, F.; Garbini, M.; Grandi, L.; Greene, Z.; Hasterok, C.; Hils, C.; Hogenbirk, E.; Howlett, J.; Iacovacci, M.; Itay, R.; Joerg, F.; Kazama, S.; Kish, A.; Kobayashi, M.; Koltman, G.; Kopec, A.; Landsman, H.; Lang, R. F.; Levinson, L.; Lin, Q.; Lindemann, S.; Lindner, M.; Lombardi, F.; Lopes, J. A. M.; López Fune, E.; Macolino, C.; Mahlstedt, J.; Manfredini, A.; Marignetti, F.; Marrodán Undagoitia, T.; Masbou, J.; Mastroianni, S.; Messina, M.; Micheneau, K.; Miller, K.; Molinario, A.; Morå, K.; Mosbacher, Y.; Murra, M.; Naganoma, J.; Ni, K.; Oberlack, U.; Odgers, K.; Palacio, J.; Pelssers, B.; Peres, R.; Pienaar, J.; Pizzella, V.; Plante, G.; Podviianiuk, R.; Qin, J.; Qiu, H.; Ramírez García, D.; Reichard, S.; Riedel, B.; Rocchetti, A.; Rupp, N.; Dos Santos, J. M. F.; Sartorelli, G.; Šarčević, N.; Scheibelhut, M.; Schindler, S.; Schreiner, J.; Schulte, D.; Schumann, M.; Scotto Lavina, L.; Selvi, M.; Shagin, P.; Shockley, E.; Silva, M.; Simgen, H.; Therreau, C.; Thers, D.; Toschi, F.; Trinchero, G.; Tunnell, C.; Upole, N.; Vargas, M.; Volta, G.; Wack, O.; Wang, H.; Wei, Y.; Weinheimer, C.; Wenz, D.; Wittweg, C.; Wulf, J.; Ye, J.; Zhang, Y.; Zhu, T.; Zopounidis, J. P.

doi:10.1103/PhysRevLett.123.251801

We report constraints on light dark matter (DM) models using ionization signals in the XENON1T experiment. We mitigate backgrounds with strong event selections, rather than requiring a scintillation signal, leaving an effective exposure of (22±3) tonne day. Above ∼0.4 keV𝑒⁢𝑒, we observe <1 event/(tonne day keV𝑒⁢𝑒), which is more than 1000 times lower than in similar searches with other detectors. Despite observing a higher rate at lower energies, no DM or CEvNS detection may be claimed because we cannot model all of our backgrounds. We thus exclude new regions in the parameter spaces for DM-nucleus scattering for DM masses 𝑚𝜒 within 3–6 GeV/𝑐2, DM-electron scattering for 𝑚𝜒 >30 MeV/𝑐2, and absorption of dark photons and axionlike particles for 𝑚𝜒 within 0.186–1 keV/𝑐2.

Light dark matter search with ionization signals in XENON1T / Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Althueser, L., Amaro, F.D., Antochi, V.C., Angelino, E., Arneodo, F., Barge, D., Baudis, L., Bauermeister, B., Bellagamba, L., Benabderrahmane, M.L., Berger, T., Breur, P.A., Brown, A., Brown, E., Bruenner, S., Bruno, G., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 123:25(2019), pp. 1-8. [10.1103/PhysRevLett.123.251801]