Search for long-lived particles using out-of-time trackless jets in proton-proton collisions at √s = 13 TeV
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Type :
Article
Publication Status :
Published
Access :
Attribution 4.0 International
openAccess
https://creativecommons.org/licenses/by/4.0/
openAccess
https://creativecommons.org/licenses/by/4.0/
Abstract
A search for long-lived particles decaying in the outer regions of the CMS silicon tracker or in the calorimeters is presented. The search is based on a data sample of proton-proton collisions at root s = 13TeV recorded with the CMS detector at the LHC in 2016-2018, corresponding to an integrated luminosity of 138 fb(-1). A novel technique, using nearly trackless and out-of-time jet information combined in a deep neural network discriminator, is employed to identify decays of long-lived particles. The results are interpreted in a simplified model of chargino-neutralino production, where the neutralino is the next-to-lightest supersymmetric particle, is long-lived, and decays to a gravitino and either a Higgs or Z boson. This search is most sensitive to neutralino proper decay lengths of approximately 0.5 m, for which masses up to 1.18TeV are excluded at 95% confidence level. The current search is the best result to date in the mass range from the kinematic limit imposed by the Higgs boson mass up to 1.8TeV.
Source :
Journal of High Energy Physics
Date :
2023-07-27
Issue :
7
Publisher :
Springer
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