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

Sirunyan, Albert M; Tumasyan, Armen; Adam, Wolfgang; Ambrogi, Federico; Bergauer, Thomas; Dragicevic, Marko; Erö, Janos; Escalante Del Valle, Alberto; Fruehwirth, Rudolf; Jeitler, Manfred

doi:10.1103/PhysRevD.104.012015

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

CMS

Collaboration

Dec 2, 2020

38 pages

Published in:

Phys.Rev.D 104 (2021) 1, 012015

Published: Jul 1, 2021

e-Print:

2012.01581 [hep-ex]

DOI:

10.1103/PhysRevD.104.012015 (publication)

PDG: Long-Lived Particle (LLP) Search at Hadron Collisions

Report number:

CMS-EXO-19-021,
CERN-EP-2020-202

Experiments:

CERN-LHC-CMS

View in:

reference search103 citations

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Abstract: (APS)

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 (C.L.) 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% C.L. 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% C.L. 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.

Note:

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-19-021 (CMS Public Pages)

p p: colliding beams
neutral particle: long-lived
decay: length
gluino: long-lived
stop: long-lived
p p: scattering
neutral particle: hadronic decay
Higgs particle: decay modes
squark: mass
gluino: mass: lower limit

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