An inclusive search is presented for long-lived particles using displaced
jets. The search uses a data sample collected with the CMS detector at the CERN
LHC in 2017 and 2018, from proton-proton collisions at a center-of-mass energy
of 13 TeV. The results of this search are combined with those of a previous
search using a data sample collected with the CMS detector in 2016, yielding a
total integrated luminosity of 132 fb$^{-1}$. The analysis searches for the
distinctive topology of displaced tracks and displaced vertices associated with
a dijet system. For a simplified model, where pair-produced long-lived neutral
particles decay into quark-antiquark pairs, pair production cross sections
larger than 0.07 fb are excluded at 95% confidence level (CL) for long-lived
particle masses larger than 500 GeV and mean proper decay lengths between 2 and
250 mm. For a model where the standard model-like Higgs boson decays to two
long-lived scalar particles that each decays to a quark-antiquark pair,
branching fractions larger than 1% are excluded at 95% CL for mean proper decay
lengths between 1 mm and 340 mm. A group of supersymmetric models with
pair-produced long-lived gluinos or top squarks decaying into various
final-state topologies containing displaced jets is also tested. Gluino masses
up to 2500 GeV and top squark masses up to 1600 GeV are excluded at 95% CL for
mean proper decay lengths between 3 and 300 mm. The highest lower bounds on
mass reach 2600 GeV for long-lived gluinos and 1800 GeV for long-lived top
squarks. These are the most stringent limits to date on these models.
Stephen Sekula
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