Search for long-lived particles decaying to jets with displaced vertices in proton-proton collisions at $\sqrt{s}=$ 13 TeV

A search is presented for long-lived particles produced in pairs in proton-proton collisions at the LHC
operating at a center-of-mass energy of 13 TeV. The data were collected with the CMS detector during the
period from 2015 through 2018, and correspond to a total integrated luminosity of 140 fb−1. This search
targets pairs of long-lived particles with mean proper decay lengths between 0.1 and 100 mm, each of
which decays into at least two quarks that hadronize to jets, resulting in a final state with two displaced
vertices. No significant excess of events with two displaced vertices is observed. In the context of R-parity
violating supersymmetry models, the pair production of long-lived neutralinos, gluinos, and top squarks is
excluded at 95% confidence level for cross sections larger than 0.08 fb, masses between 800 and 3000 GeV,
and mean proper decay lengths between 1 and 25 mm