Search for pair production of heavy particles decaying to a top quark and a gluon in the lepton+jets final state in proton–proton collisions at √s = 13 Te V
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10052_2024_Article_13729.pdf
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2.42 MB
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107a67cb71594eb311d077a655da1998
Author(s)
CMS Collaboration
Date Issued
March 25, 2025
Journal
The European Physical Journal C
Publisher
Springer Berlin Heidelberg
Citation
CMS Collaboration. Search for pair production of heavy particles decaying to a top quark and a gluon in the lepton+jets final state in proton–proton collisions at √s = 13 TeV. Eur. Phys. J. C 85, 342 (2025).
Version
Final published version
Abstract
A search is presented for the pair production of new heavy resonances, each decaying into a top quark (t) or antiquark and a gluon (g). The analysis uses data recorded with the CMS detector from proton–proton collisions at a center-of-mass energy of 13 Te V at the LHC, corresponding to an integrated luminosity of 138 fb - 1 . Events with one muon or electron, multiple jets, and missing transverse momentum are selected. After using a deep neural network to enrich the data sample with signal-like events, distributions in the scalar sum of the transverse momenta of all reconstructed objects are analyzed in the search for a signal. No significant deviations from the standard model prediction are found. Upper limits at 95% confidence level are set on the product of cross section and branching fraction squared for the pair production of excited top quarks in the t ∗ → tg decay channel. The upper limits range from 120 to 0.8 fb for a t ∗ with spin-1/2 and from 15 to 1.0 fb for a t ∗ with spin-3/2. These correspond to mass exclusion limits up to 1050 and 1700 Ge V for spin-1/2 and spin-3/2 t ∗ particles, respectively. These are the most stringent limits to date on the existence of t ∗ → tg resonances.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-024-13729-y
