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 s=13TeV.
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| Title: | 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 s=13TeV. |
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| Authors: | Hayrapetyan, A.1 (AUTHOR), Tumasyan, A.1,2 (AUTHOR), Adam, W.3 (AUTHOR), Andrejkovic, J. W.3 (AUTHOR), Benato, L.3 (AUTHOR), Bergauer, T.3 (AUTHOR), Chatterjee, S.3,4 (AUTHOR), Damanakis, K.3 (AUTHOR), Dragicevic, M.3 (AUTHOR), Hussain, P. S.3 (AUTHOR), Jeitler, M.3,5 (AUTHOR), Krammer, N.3 (AUTHOR), Li, A.3 (AUTHOR), Liko, D.3 (AUTHOR), Mikulec, I.3 (AUTHOR), Schieck, J.3,5 (AUTHOR), Schöfbeck, R.3,5 (AUTHOR), Schwarz, D.3 (AUTHOR), Sonawane, M.3 (AUTHOR), Waltenberger, W.3 (AUTHOR) |
| Source: | European Physical Journal C -- Particles & Fields. Mar2025, Vol. 85 Issue 3, p1-29. 29p. |
| Subjects: | Artificial neural networks, Heavy particles (Nuclear physics), Particle decays, Pair production, Top quarks, Proton-proton interactions |
| 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 Te V 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 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 0.8 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 Ge V 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. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| 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 Te V 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 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 0.8 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 Ge V 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. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 14346044 |
| DOI: | 10.1140/epjc/s10052-024-13729-y |
