First Search for Light Dark Matter in the Neutrino Fog with XENONnT
E. Aprile,J. Aalbers,K. Abe,S. Ahmed Maouloud,L. Althueser,B. Andrieu,E. Angelino,D. Antón Martin,F. Arneodo,L. Baudis,M. Bazyk,L. Bellagamba,R. Biondi,A. Bismark,K. Boese,A. Brown,G. Bruno,R. Budnik,C. Cai,C. Capelli,J. M. R. Cardoso,A. P. Cimental Chávez,A. P. Colijn,J. Conrad,J. J. Cuenca-García,V. D'Andrea,L. C. Daniel Garcia,M. P. Decowski,A. Deisting,C. Di Donato,P. Di Gangi,S. Diglio,K. Eitel,S. el Morabit,A. Elykov,A. D. Ferella,C. Ferrari,H. Fischer,T. Flehmke,M. Flierman,W. Fulgione,C. Fuselli,P. Gaemers,R. Gaior,M. Galloway,F. Gao,S. Ghosh,R. Giacomobono,R. Glade-Beucke,L. Grandi,J. Grigat,H. Guan,M. Guida,P. Gyorgy,R. Hammann,A. Higuera,C. Hils,L. Hoetzsch,N. F. Hood,M. Iacovacci,Y. Itow,J. Jakob,F. Joerg,Y. Kaminaga,M. Kara,P. Kavrigin,S. Kazama,M. Kobayashi,D. Koke,A. Kopec,H. Landsman,R. F. Lang,L. Levinson,I. Li,S. Li,S. Liang,Y. -T. Lin,S. Lindemann,M. Lindner,K. Liu,M. Liu,J. Loizeau,F. Lombardi,J. Long,J. A. M. Lopes,T. Luce,Y. Ma,C. Macolino,J. Mahlstedt,A. Mancuso,L. Manenti,F. Marignetti,T. Marrodán Undagoitia,K. Martens,J. Masbou,E. Masson,S. Mastroianni,A. Melchiorre,J. Merz,M. Messina,A. Michael,K. Miuchi,A. Molinario,S. Moriyama,K. Morå,Y. Mosbacher,M. Murra,J. Müller,K. Ni,U. Oberlack,B. Paetsch,Y. Pan,Q. Pellegrini,R. Peres,C. Peters,J. Pienaar,M. Pierre,G. Plante,T. R. Pollmann,L. Principe,J. Qi,J. Qin,D. Ramírez García,M. Rajado,R. Singh,L. Sanchez,J. M. F. dos Santos,I. Sarnoff,G. Sartorelli,J. Schreiner,P. Schulte,H. Schulze Eißing,M. Schumann,L. Scotto Lavina,M. Selvi,F. Semeria,P. Shagin,S. Shi,J. Shi,M. Silva,H. Simgen,C. Szyszka,A. Takeda,P. -L. Tan,D. Thers,F. Toschi,G. Trinchero,C. D. Tunnell,F. Tönnies,K. Valerius,S. Vecchi,S. Vetter,F. I. Villazon Solar,G. Volta,C. Weinheimer,M. Weiss,D. Wenz,C. Wittweg,V. H. S. Wu,Y. Xing,D. Xu,Z. Xu,M. Yamashita,L. Yang,J. Ye,L. Yuan,G. Zavattini,M. Zhong
arxiv（2024）
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摘要
We search for dark matter (DM) with a mass [3,12] GeV / c^2 using an exposure of 3.51 t×y with the XENONnT experiment. We consider spin-independent, spin-dependent, momentum-dependent, mirror DM, and self-interacting DM with a light mediator coupling to Standard Model particles. Using a lowered energy threshold compared to the previous WIMP search, a blind analysis of [0.5, 5.0] keV nuclear recoil events reveals no significant signal excess over the background. XENONnT excludes spin-independent DM-nucleon cross sections >2.5 × 10^-45 cm^2 at 90 % confidence level for 6 GeV / c^2 DM. The solar ^8 B neutrino coherent elastic neutrino-nucleus scattering background accounts for approximately half of the background in the signal region. In the considered mass range, the DM sensitivity approaches the 'neutrino fog', the limitation where neutrinos produce a signal that is indistinguishable from that of light DM-xenon nucleus scattering.
