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 $$sqrt{s}=13,text {Te}hspace{-.08em}text {V} $$
Journal Article
Overview
abstract
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; ; $$,text {Te}hspace{-.08em}text {V}$$; ; ; ; Te; ; V; ; ; ; at the LHC, corresponding to an integrated luminosity of 138; ; $$,text {fb}^{-1}$$; ; ; ; ; 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 ; ; $$text {t}^{*} rightarrow {text {t}} {text {g}} $$; ; ; ; t; ; ; ; ∗; ; ; →; tg; ; ; ; decay channel. The upper limits range from 120 to 0.8; ; $$,text {fb}$$; ; ; ; fb; ; ; ; for a ; ; $$text {t}^{*} $$; ; ; t; ; ; ; ∗; ; ; ; ; with spin-1/2 and from 15 to 1.0; ; $$,text {fb}$$; ; ; ; fb; ; ; ; for a ; ; $$text {t}^{*} $$; ; ; t; ; ; ; ∗; ; ; ; ; with spin-3/2. These correspond to mass exclusion limits up to 1050 and 1700; ; $$,text {Ge}hspace{-.08em}text {V}$$; ; ; ; Ge; ; V; ; ; ; for spin-1/2 and spin-3/2 ; ; $$text {t}^{*} $$; ; ; t; ; ; ; ∗; ; ; ; ; particles, respectively. These are the most stringent limits to date on the existence of ; ; $$text {t}^{*} rightarrow {text {t}} {text {g}} $$; ; ; ; t; ; ; ; ∗; ; ; →; tg; ; ; ; resonances.
