Event

I present the search for emerging jets produced in proton-proton collisions at a center-of-mass energy of 13 TeV 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 discusses 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.