Speaker
Description
The PandaX-4T experiment employs a liquid xenon time projection chamber (TPC) to investigate keV-scale nuclear recoils, with the primary objective of directly detecting heavy cold dark matter (10GeV – 10TeV). Additionally, PandaX-4T has expanded its exploration to the sub-keV energy range by reducing the analysis threshold. As a result, it has achieved remarkable sensitivities in searching for solar B8 neutrinos via the coherent elastic neutrino-nucleus scattering (CEvNS) channel and light dark matter through its interaction with shell electrons. However, this reduction in threshold has given rise to significant challenges, including the increased accidental pileups and single electron backgrounds. In this presentation, I will primarily focus on elucidating our model and understanding for these two backgrounds and discussing the corresponding techniques we have developed to mitigate them. Furthermore, I will touch upon a proposal involving a single-phase TPC that shows promise in eliminating such background sources.
