In this section
@article{Collaboration:2025:1361-6633/ae2207,
author = {Collaboration, TC},
doi = {1361-6633/ae2207},
journal = {Rep Prog Phys},
title = {Search for heavy pseudoscalar and scalar bosons decaying to a top quark pair in proton-proton collisions ats=13TeV.},
url = {http://dx.doi.org/10.1088/1361-6633/ae2207},
volume = {88},
year = {2025}
}
TY - JOUR
AB - A search for pseudoscalar or scalar bosons decaying to a top quark pair (tt¯) in final states with one or two charged leptons is presented. The analyzed proton-proton collision data was recorded ats=13TeVby the CMS experiment at the CERN LHC and corresponds to an integrated luminosity of 138 fb-1. The invariant massmtt¯of the reconstructedtt¯system and variables sensitive to its spin and parity are used to discriminate against the standard modeltt¯background. Interference between pseudoscalar or scalar boson production and the standard modeltt¯continuum is included, leading to peak-dip structures in themtt¯distribution. An excess of the data above the background prediction, based on perturbative quantum chromodynamics (QCD) calculations, is observed near the kinematictt¯production threshold, while good agreement is found for highmtt¯. The data are consistent with the background prediction if the contribution from a simplified model of a color-singlet1S0[1]tt¯quasi-bound stateηt, inspired by nonrelativistic QCD, is added. Upper limits at 95% confidence level are set on the coupling between the pseudoscalar or scalar bosons and the top quark for boson masses in the range 365-1000 GeV, relative widths between 0.5% and 25%, and two background scenarios with or withoutηtcontribution.
AU - Collaboration,TC
DO - 1361-6633/ae2207
PY - 2025///
TI - Search for heavy pseudoscalar and scalar bosons decaying to a top quark pair in proton-proton collisions ats=13TeV.
T2 - Rep Prog Phys
UR - http://dx.doi.org/10.1088/1361-6633/ae2207
UR - https://www.ncbi.nlm.nih.gov/pubmed/41264931
VL - 88
ER -