The first observation of single top quark production in association with a (Formula presented) and a (Formula presented) boson in proton-proton collisions is reported. The analysis uses data at center-of-mass energies of 13 and 13.6 TeV recorded with the CMS detector at the CERN LHC, corresponding to a total integrated luminosity of (Formula presented). Events with three or four charged leptons, which can be electrons or muons, are selected. Advanced machine-learning algorithms and improved reconstruction methods, compared to an earlier analysis, result in an unprecedented sensitivity to (Formula presented) production. The measured cross sections for (Formula presented) production are (Formula presented) and (Formula presented) for (Formula presented) and 13.6 TeV, respectively. The signal is established with a statistical significance of 5.8 standard deviations, with 3.5 expected, compared to the background-only hypothesis.

Hayrapetyan, A., Makarenko, V., Tumasyan, A., Adam, W., Andrejkovic, J., Benato, L., et al. (2026). Observation of (Formula presented) Production at the CMS Experiment. PHYSICAL REVIEW LETTERS, 136(8) [10.1103/rk6w-1pcl].

Observation of (Formula presented) Production at the CMS Experiment

Xiao J.;Brivio F.;Camagni V.;Cetorelli F.;De Guio F.;Dinardo M. E.;Gerosa R.;Ghezzi A.;Govoni P.;Guzzi L.;Lavizzari G.;Lucchini M. T.;Malberti M.;Moroni L.;Paganoni M.;Palluotto S.;Perego A.;Pizzati G.;Ragazzi S.;Tabarelli de Fatis T.;
2026

Abstract

The first observation of single top quark production in association with a (Formula presented) and a (Formula presented) boson in proton-proton collisions is reported. The analysis uses data at center-of-mass energies of 13 and 13.6 TeV recorded with the CMS detector at the CERN LHC, corresponding to a total integrated luminosity of (Formula presented). Events with three or four charged leptons, which can be electrons or muons, are selected. Advanced machine-learning algorithms and improved reconstruction methods, compared to an earlier analysis, result in an unprecedented sensitivity to (Formula presented) production. The measured cross sections for (Formula presented) production are (Formula presented) and (Formula presented) for (Formula presented) and 13.6 TeV, respectively. The signal is established with a statistical significance of 5.8 standard deviations, with 3.5 expected, compared to the background-only hypothesis.
Articolo in rivista - Articolo scientifico
Bosons; Charged particles; Learning algorithms; Learning systems; Machine learning; Particle detectors
English
25-feb-2026
2026
136
8
081802
none
Hayrapetyan, A., Makarenko, V., Tumasyan, A., Adam, W., Andrejkovic, J., Benato, L., et al. (2026). Observation of (Formula presented) Production at the CMS Experiment. PHYSICAL REVIEW LETTERS, 136(8) [10.1103/rk6w-1pcl].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/598147
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