Tsung-Dao Lee Institute hosted an international Open Meeting for the PandaX-xT project from April 7-11, 2025. PandaX (Particle and Astrophysical Xenon project, https://pandax.sjtu.edu.cn/), operating at the China Jinping Underground Laboratory (CJPL), utilizes staged xenon detectors to probe dark matter particles and investigate neutrino properties. The current stage experiment, PandaX-4T, has been operational since 2021. Meanwhile, the collaboration is developing its next-phase facility - PandaX-xT. This multi-ten-tonne liquid xenon observatory aims to achieve ultra-low background levels for multidisciplinary research. With approximately 40-tonne active xenon target, the full-scale PandaX-xT will explore new frontiers in dark matter detection, Majorana neutrino studies, astrophysical neutrino observations, and other ultra-rare particle interactions.

The week started with a three-day theory/phenomenology workshop at TDLI. During the subsequent two-day Open Meeting, the PandaX collaboration outlined the phased implementation plan for PandaX-xT, as well as design details and readiness of individual components of the experiment. Approximately 20 international experts shared perspectives on both scientific opportunities and technical challenges during the five-day program.

Participants of the Open Meeting have endorsed the formation of “PandaX and Friends: An Open Consortium”, an open platform for physicists, engineers, and industrial partners to discuss and explore the science and technology of the PandaX experiment. In parallel, the PandaX collaboration invites experimental researchers worldwide to join the collaboration to co-develop the future stage experiments.

Editor on Duty: Yan Cheng