Direct dark matter searches with the full data set of XMASS-I

Le résumé fourni par la source

Various weakly interacting massive particle (WIMP) dark matter searches using the full data set of XMASS-I, a single-phase liquid xenon detector, are reported in this paper. Stable XMASS-I data taking accumulated a total live time of 1590.9 days between November 20, 2013 and February 1, 2019 with an analysis threshold of $1.0\text{ }\text{ }{\mathrm{keV}}_{\mathrm{ee}}$. In the latter half of data taking a lower analysis threshold of $0.5\text{ }\text{ }{\mathrm{keV}}_{\mathrm{ee}}$ was also available through a new low threshold trigger. Searching for a WIMP signal in the detector's 97 kg fiducial volume yielded a limit on the WIMP-nucleon scattering cross section of $1.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}44}\text{ }\text{ }{\mathrm{cm}}^{2}$ for a $60\text{ }\text{ }\mathrm{GeV}/{\mathrm{c}}^{2}$ WIMP at the 90% confidence level. We also searched for WIMP induced annual modulation signatures in the detector's whole target volume, containing 832 kg of liquid xenon. For nuclear recoils of a $8\text{ }\text{ }\mathrm{GeV}/{\mathrm{c}}^{2}$ WIMP this analysis yielded a 90% confidence level (CL) cross section limit of $2.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}42}\text{ }\text{ }{\mathrm{cm}}^{2}$. Annual modulation signatures from the Migdal effect and bremsstrahlung at a WIMP mass of $0.5\text{ }\text{ }\mathrm{GeV}/{\mathrm{c}}^{2}$ are evaluated and lead to 90% CL cross section limits of $1.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}35}\text{ }\text{ }{\mathrm{cm}}^{2}$ and $1.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}33}\text{ }\text{ }{\mathrm{cm}}^{2}$, respectively.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.