Hayrapetyan, A.Tumasyan, A.Adam, W.Andrejkovic, J. W.Benato, L.Bergauer, T.Chatterjee, S.2026-04-252026-04-2520251434-60441434-6052https://doi.org/10.1140/epjc/s10052-024-13729-yhttps://hdl.handle.net/11486/8452A 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 TeV 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 standardmodel 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 GeV 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.eninfo:eu-repo/semantics/openAccessArticle85310.1140/epjc/s10052-024-13729-y2-s2.0-105012849726Q1WOS:001458700100001Q20000-0001-7513-63300000-0002-5152-90060000-0002-8133-64670000-0002-1061-38770000-0002-1733-44080000-0002-0711-63190000-0003-3072-1020