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Search for heavy pseudoscalar and scalar bosons decaying to a top quark pair in proton-proton collisions at √s = 13 TeV

The CMS collaboration; Makarenko, V.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Benato, L.; Bergauer, T.; Dragicevic, M.; Giordano, C.; Hussain, P. S.; Jeitler, M.; Krammer, N.; Li, A.; Liko, D.; Matthewman, M.; Mikulec, I.; Schieck, J.; Schöfbeck, R.; Schwarz, D.; ... mehr

Abstract:

A search for pseudoscalar or scalar bosons decaying to a top quark pair ($t\overline{t}$) in final states with one or two charged leptons is presented. The analyzed proton–proton collision data was recorded at $\sqrt{s}$ = 13 TeV by the CMS experiment at the CERN LHC and corresponds to an integrated luminosity of 138 fb$^{−1}$. The invariant mass m$_{t\overline{t}}$ of the reconstructed $t\overline{t}$ system and variables sensitive to its spin and parity are used to discriminate against the standard model $t\overline{t}$ background. Interference between pseudoscalar or scalar boson production and the standard model $t\overline{t}$ continuum is included, leading to peak-dip structures in the m$_{t\overline{t}}$ distribution. An excess of the data above the background prediction, based on perturbative quantum chromodynamics (QCD) calculations, is observed near the kinematic $t\overline{t}$ production threshold, while good agreement is found for high m$_{t\overline{t}}$. The data are consistent with the background prediction if the contribution from a simplified model of a color-singlet $^1$S$^{[1]}_0$ $t\overline{t}$ quasi-bound state $η_t$, inspired by nonrelativistic QCD, is added. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000192495
Veröffentlicht am 21.05.2026
Originalveröffentlichung
DOI: 10.1088/1361-6633/ae2207
Scopus
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Scientific Computing Center (SCC)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 05.12.2025
Sprache Englisch
Identifikator ISSN: 0034-4885, 1361-6633
KITopen-ID: 1000192495
Erschienen in Reports on Progress in Physics
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 88
Heft 12
Seiten 127801
Externe Relationen Siehe auch
Schlagwörter CMS, top quark, scalar boson, pseudoscalar boson
Nachgewiesen in Scopus
Web of Science
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