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Abstract: The nature of dark matter is one of the most important unanswered questions in particle physics. Based on certain assumptions, well-motivated models suggest that new dark sector particles could couple to massless dark photon and result in a small effective electric charge. These dark matter candidates are generically referred to as millicharged particles. Recently during the LHC Run 2, a prototype scintillator-based detector, milliQan demonstrator, was deployed at the CMS site to conduct the first search of millicharged
particles at a hadron collider. In 2022, two new detectors are being constructed and commissioned for the LHC Run 3 data taking to further increase the sensitivity to the millicharged particles. In this talk, I will introduce the milliQan experiment, recent progress and highlights on the Run 3 detectors and future perspective of searching for millicharged particles at colliders.
Biography: Dr. Hualin Mei is a postdoctoral scholar from University of California, Santa Barbara, working on the CMS and milliQan experiments. He obtained his Ph.D. degree in 2018 from University of Florida, and B.S. degree in 2012 from Wuhan University. His research interests in CMS include properties measurements of the Higgs boson, search for BSM physics using
the Higgs boson as a tool. He is currently the co-convener of the CMS Higgs to diphoton physics analysis group. He has also made important contributions to CMS's endcap muon system since 2013 in various aspects including operation, performance study, local reconstruction, DAQ electronics upgrade and its software/firmware developments. In 2022, he joined the milliQan experiment, participated in the construction and commissioning of the Run 3 detectors, and led the developments of DAQ and on-line monitoring of the experiment.