An Inclusive Search for New Long-lived Particles at the Large Hadron Collider in sqrt(s)=13 TeV Data

Abstract

A search for long-lived particles was performed with data corresponding to an inte- grated luminosity of 2.6 fb^-1 collected at a center-of-mass energy of 13 TeV by the CMS experiment in 2015. The analysis exploits two customized topological trigger algorithms and an online displaced-jet tagging algorithm. The multiplicity of displaced jets is used to search for the presence of a signal with a proper lifetime between 1 mm and 1000 mm. Pair-produced long-lived decays to four jet final states, with cross sections larger than 1.2 fb are excluded for a proper lifetime of 50 mm. For pair-produced long-lived decays to two b quarks and two leptons with equal decay rates between lepton flavors, cross sections larger than 2.5 fb are excluded for proper lifetimes between 70 mm and 100 mm. As a mass exclusion bound, pair-produced long-lived R-parity violating top squarks lighter than 550–1130 GeV are excluded depending on their lifetime and decay mode. This mass exclusion bound is currently the most stringent bound available for top squark proper lifetimes greater than 3 mm.