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arxiv: 2409.17868 · v2 · pith:ZCDIGBCAnew · submitted 2024-09-26 · ✦ hep-ex

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. Ant\'on Martin
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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 Ch\'avez A. P. Colijn J. Conrad J. J. Cuenca-Garc\'ia 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. Marrod\'an Undagoitia K. Martens J. Masbou E. Masson S. Mastroianni A. Melchiorre J. Merz M. Messina A. Michael K. Miuchi A. Molinario S. Moriyama K. Mor{\aa} Y. Mosbacher M. Murra J. M\"uller 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. Ram\'irez Garc\'ia M. Rajado R. Singh L. Sanchez J. M. F. dos Santos I. Sarnoff G. Sartorelli J. Schreiner P. Schulte H. Schulze Ei{\ss}ing 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. T\"onnies 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
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classification ✦ hep-ex
keywords mathrmlightsearchxenonntdarkdm-nucleoninteractionsmass
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We search for dark matter (DM) with a mass [3,12] $\mathrm{GeV} / c^2$ using an exposure of 3.51 $\mathrm{t} \times \mathrm{y}$ with the XENONnT experiment.We consider spin-independent DM-nucleon interactions mediated by a heavy or light mediator, spin-dependent DM-neutron interactions, momentum-dependent DM scattering, and mirror DM. Using a lowered energy threshold compared to the previous WIMP search, a blind analysis of [0.5, 5.0] $\mathrm{keV}$ nuclear recoil events reveals no significant signal excess over the background. XENONnT excludes spin-independent DM-nucleon cross sections $>2.5 \times 10^{-45} \mathrm{~cm}^2$ at $90 \%$ confidence level for 6 $\mathrm{GeV} / c^2$ DM. 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.

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