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    Dark matter direct search result from InDEx run2 at JUSL

    Susmita Das1,2, Mala Das1,2,*, Vimal Kumar1,2, Suraj Ali3, Nilanjan Biswas1, Shantonu Sahoo4, and Niraj Chaddha4

    • *Contact author: mala.das@saha.ac.in

    Phys. Rev. D 112, 042003 – Published 6 August, 2025

    DOI: https://doi.org/10.1103/vpb7-kdrz

    Abstract

    The Indian Dark matter search Experiment (InDEx) has been initiated at Jaduguda Underground Science Laboratory to explore the low mass region of dark matter. The detectors used by InDEx are superheated droplet detectors with active liquid C2H2F4. The run1 of InDEx was with 2.47  kg−days of exposure at a threshold of 5.87 keV. In the present work, the run2 of InDEx, the detectors were set at 1.95 keV thresholds with an active liquid mass of 70.4 g. For a runtime of 102.48 days, the experimental results set constraint on spin-independent cross section at (1.55+(+0.62−0.32)stat+(+0.03−0.02)sys)×10−40  cm2 (90% C.L.) and spin-dependent limit on F at (7.97+(+3.44−1.78)stat+(+0.15−0.18)sys)×10−38  cm2 (90% C.L.) for 20.4  GeV/c2 and 21.0  GeV/c2 weakly interacting massive particle (WIMP) mass, respectively. There is a shift of the most sensitive WIMP mass towards the lower region and an improvement of the sensitivity limit over the InDEx run1.

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