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Special EPE Seminar: Yi-Mu Chen
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US/Pacific
Description
Title: Search for Emerging Jets at CMS
Abstract: This talk present the search for emerging jets produced in proton-proton collisions at a center-of-mass energy of 13 TeV is performed using data collected by the CMS experiment corresponding to an integrated luminosity of 138 fb-1. This search examines a hypothetical dark QCD sector that couples to the standard model (SM) through a scalar mediator. The scalar mediator decays into a standard model quark and a dark sector quark. As the dark sector quark showers and hadronizes, it produces long-lived dark mesons that subsequently decay into SM particles, resulting in a jet with multiple displaced vertices, known as an emerging jet. This search looks for pair production of the scalar mediators at the LHC, yielding events with two SM jets and two emerging jets at leading order. This presentation discuss the CMS sensitivity to the such dark sector phenomenons using novel jet tagging techniques using graph-neural networks with the background estimated via a fully data-based technique, and the first analysis to explore the scenario where the dark sector has coupling to multiple SM particles.
Bio: Yi-Mu Chen is a Ph. D graduate from the Department of Physics at the University of Maryland, College Park as a member of the CMS group. Yi-Mu completed his Master of Science at the Department of Physics at National Taiwan University, where he contributed the analysis of a search of excited top quark pair production using the 2016 CMS data. At the University of Maryland, his research focused on the research of the search for exotic dark sector signatures using CMS Run 2 data, and also worked on the simulation, measurement, and design of the quality control system for the production of the HGCAL SiPM-on-tileboard electronics that will be deployed for the CMS Phase 2 upgrade.
