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 13TeV at the LHC, corresponding to an integrated luminosity of 138fb-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 0.8fb for a t∗ with spin-1/2 and from 15 to 1.0fb for a t∗ with spin-3/2. These correspond to mass exclusion limits up to 1050 and 1700GeV 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.

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 TeV / null, n., Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J.W., Benato, L., Bergauer, T., Chatterjee, S., Damanakis, K., Dragicevic, M., Hussain, P.S., Jeitler, M., Krammer, N., Li, A., Liko, D., Mikulec, I., Schieck, J., Schöfbeck, R., Schwarz, D., Sonawane, M., et al.. - In: EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6052. - ELETTRONICO. - 85:(2025), pp. 342.0-342.0. [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+jets final state in proton–proton collisions at sqrt(s) =13 TeV

Ciulli, V.;D'Alessandro, R.;Focardi, E.;Latino, G.;Lenzi, P.;Calandri, A.;
2025

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 13TeV at the LHC, corresponding to an integrated luminosity of 138fb-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 0.8fb for a t∗ with spin-1/2 and from 15 to 1.0fb for a t∗ with spin-3/2. These correspond to mass exclusion limits up to 1050 and 1700GeV 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
85
0
0
null, null; Hayrapetyan, A.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Benato, L.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Huss...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1439435
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