First dark matter search results of the XENON1T experiment

Di Gangi, P. (2018) First dark matter search results of the XENON1T experiment. Il nuovo cimento C, 41 (3). pp. 1-9. ISSN 1826-9885


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The XENON1T experiment is the first ton-scale dual-phase (liquidgas) xenon time projection chamber, currently in operation at the Laboratori Nazionali del Gran Sasso in Italy. The experiment aims at the dark matter direct detection exploiting a ∼ 2000 kg mass of liquid xenon as a target for interactions of weakly interacting massive particles (WIMPs) with xenon nuclei. We report the blinded search results of the first science run, using 34.2 livedays of data acquired between November 2016 and January 2017. The WIMP dark matter search is performed inside a (1042 ± 12) kg fiducial mass and in the [5,40] keVnr energy range of interest, in which the electronic recoil background was (1.93 ± 0.25) × 10−4 events/( kg×day×keVee). Such a background level is the lowest ever achieved in a dark matter detector. The data analysis is performed with the profile likelihood approach and the observations result to be consistent with the background-only hypothesis, thus leading to exclusion limits on the spinindependent WIMP-nucleon interaction cross section for WIMP masses between 6 and 104 GeV/c2. The most stringent limit is obtained for 35 GeV/c2 WIMPs at 7.7 × 10−47 cm2 with 90% confidence level (XENON Collaboration (Aprile E. et al.), Phys. Res. Lett., 119 (2017) 181301), which is the lowest cross section ever probed to date.

Item Type: Article
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 18 Nov 2020 08:55
Last Modified: 18 Nov 2020 08:55

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