Inclusive search for new particles decaying to displaced jets at $\sqrt{s} = 13~\mathrm{TeV}$

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