Search for long-lived particles using out-of-time trackless jets in proton-proton collisions at $ \sqrt{s} $ = 13 TeV
(2023) Journal of High Energy Physics — Vol. 07 (2023)
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- 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 $ \sqrt{s} $ = 13 TeV marc: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 1.18 TeV 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 1.8 TeV.[graphic not available: see fulltext]
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Benecke, A., Bruno, G., Bury, F., Caputo, C., David, P., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Jain, S., Lemaitre, V., Mondal, K., Taliercio, A., Tran, T. T., Vischia, P., Wertz, S., CMS, Bethani, A., & et al. (2023). Search for long-lived particles using out-of-time trackless jets in proton-proton collisions at $ \sqrt{s} $ = 13 TeV. Journal of High Energy Physics, 07. https://doi.org/10.1007/JHEP07(2023)210 (Original work published 2023)