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Search for new long-lived particles at √s = 13 TeV

Search for new long-lived particles at √s = 13 TeV
Search for new long-lived particles at √s = 13 TeV
A search for long-lived particles was performed with data corresponding to an integrated 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 uses the multiplicity of displaced jets to search for the presence of a signal decay occurring at distances between 1 and 1000 mm. The results can be interpreted in a variety of different models. For pair-produced long-lived particles decaying 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 decay lengths between 70–100 mm for a long-lived particle mass of 1130 GeV at 95% confidence. For a specific model of pair-produced, long-lived top squarks with R-parity violating decays to a b quark and a lepton, masses below 550–1130 GeV are excluded at 95% confidence for equal branching fractions between lepton flavors, depending on the squark decay length. This mass bound is the most stringent to date for top squark proper decay lengths greater than 3 mm.
0370-2693
432-452
Belyaev, A.
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Belyaev, A.
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

Belyaev, A. , The CMS Collaboration (2018) Search for new long-lived particles at √s = 13 TeV. Physics Letters B, 780, 432-452. (doi:10.1016/j.physletb.2018.03.019).

Record type: Article

Abstract

A search for long-lived particles was performed with data corresponding to an integrated 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 uses the multiplicity of displaced jets to search for the presence of a signal decay occurring at distances between 1 and 1000 mm. The results can be interpreted in a variety of different models. For pair-produced long-lived particles decaying 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 decay lengths between 70–100 mm for a long-lived particle mass of 1130 GeV at 95% confidence. For a specific model of pair-produced, long-lived top squarks with R-parity violating decays to a b quark and a lepton, masses below 550–1130 GeV are excluded at 95% confidence for equal branching fractions between lepton flavors, depending on the squark decay length. This mass bound is the most stringent to date for top squark proper decay lengths greater than 3 mm.

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Accepted/In Press date: 7 March 2018
e-pub ahead of print date: 14 March 2018
Published date: 10 May 2018

Identifiers

Local EPrints ID: 419603
URI: https://eprints.soton.ac.uk/id/eprint/419603
ISSN: 0370-2693
PURE UUID: a0e12eaa-b62a-454c-b7cc-70b606a5a8a3
ORCID for A. Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

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Date deposited: 16 Apr 2018 16:30
Last modified: 15 Mar 2019 01:33

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