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 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.

Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J.W., Benato, L., Bergauer, T., et al. (2025). Search for pair production of heavy particles decaying to a top quark and a gluon in the lepton plus jets final state in proton-proton collisions at √s=13 TeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 85(3) [10.1140/epjc/s10052-024-13729-y].

Search for pair production of heavy particles decaying to a top quark and a gluon in the lepton plus jets final state in proton-proton collisions at √s=13 TeV

Ciocci, M. A.;Turini, N.;
2025-01-01

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 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.
2025
Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J.W., Benato, L., Bergauer, T., et al. (2025). Search for pair production of heavy particles decaying to a top quark and a gluon in the lepton plus jets final state in proton-proton collisions at √s=13 TeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 85(3) [10.1140/epjc/s10052-024-13729-y].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1324316