CMS-PAS-B2G-22-005

CMS-PAS-B2G-22-005
Search for pair production of heavy particles decaying to a top quark and a gluon in the lepton+jets final state at $\sqrt{s}=$ 13 TeV
CMS Collaboration
20 July 2024

Abstract: A search is presented for the pair production of new heavy resonances, each decaying into a top quark or antiquark and a gluon. The analysis uses data recorded with the CMS detector from proton-proton collisions at a center-of-mass energy of 13 TeV, 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 search for a signal. No significant deviations from the standard model predictions are found. Upper limits at 95% confidence level are set on the product of cross section times branching fraction squared for the pair production of two excited top quarks in the $\mathrm{t}^{} \to \mathrm{t}\mathrm{g}$ decay channel. The upper limits range from 0.12 pb to 0.8 fb for a $\mathrm{t}^{}$ with spin-1/2 and from 0.015 pb to 1.0 fb for a $\mathrm{t}^{}$ with spin-3/2. This corresponds to mass exclusion limits up to 1050 and 1700 GeV for spin-1/2 and spin-3/2 $\mathrm{t}^{}$ particles, respectively.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to EPJC. The superseded preliminary plots can be found here.

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