Light WIMP search with the NEWS-G experiment

The NEWS-G experiment uses spherical proportional counters (SPC) to probe for low-mass dark matter. An SPC is a metallic sphere filled with gas, featuring a high-voltage anode at its center, which produces a radial electric field. The interaction between a dark matter particle and a nucleus can cause ionization of the gas, resulting in an electron avalanche near the anode and a detectable signal. The latest NEWS-G detector, S-140, is a copper sphere with a diameter of 140 cm, which took 10 days of data with methane at the LSM, producing world-leading WIMP-proton spin-dependent limits. The detector is now taking data at SNOLAB with various gases, including neon and helium. The LSM and SNOLAB campaigns have also highlighted new challenges to overcome to maximize the detector's capabilities. This, in turn, led to the development of interesting new techniques in terms of characterization, discrimination, and reduction of backgrounds. This talk will describe the NEWS-G experiment, present the latest results from the LSM data and discuss the progress on data taking and analysis at SNOLAB.