Search for heavy pseudoscalar and scalar bosons decaying to a top quark pair in proton–proton collisions at; ; ; ; s; ; =; 13; ; TeV; ; Journal Article uri icon

Overview

abstract

  • Abstract; ; A search for pseudoscalar or scalar bosons decaying to a top quark pair (; ; ; ; ; ; ; ; t; ; ; ; t; ¯; ; ; ; ; ; ) in final states with one or two charged leptons is presented. The analyzed proton–proton collision data was recorded at; ; ; ; ; ; ; ; 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; ; ; ; ; t; ; ¯; ; ; ; ; ; ; ; of the reconstructed; ; ; ; ; ; ; ; t; ; ; ; t; ¯; ; ; ; ; ; system and variables sensitive to its spin and parity are used to discriminate against the standard model; ; ; ; ; ; ; ; t; ; ; ; t; ¯; ; ; ; ; ; background. Interference between pseudoscalar or scalar boson production and the standard model; ; ; ; ; ; ; ; t; ; ; ; t; ¯; ; ; ; ; ; continuum is included, leading to peak-dip structures in the; ; ; ; ; ; ; ; m; ; ; t; ; ; ; ; t; ; ¯; ; ; ; ; ; ; ; distribution. An excess of the data above the background prediction, based on perturbative quantum chromodynamics (QCD) calculations, is observed near the kinematic; ; ; ; ; ; ; ; t; ; ; ; t; ¯; ; ; ; ; ; production threshold, while good agreement is found for high; ; ; ; ; ; ; ; m; ; ; t; ; ; ; ; t; ; ¯; ; ; ; ; ; ; ; . The data are consistent with the background prediction if the contribution from a simplified model of a color-singlet; ; ; ; ; ; ; ; ; 1; ; ; S; 0; ; [; 1; ]; ; ; ; ; ; ; ; ; ; ; ; ; t; ; ; ; t; ¯; ; ; ; ; ; quasi-bound state; ; ; ; ; ; ; ; η; ; ; t; ; ; ; ; ; ; , 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 without; ; ; ; ; ; ; ; η; ; ; t; ; ; ; ; ; ; contribution.;

publication date

  • December 1, 2025

Date in CU Experts

  • December 10, 2025 5:48 AM

Full Author List

  • Collaboration TCMS

author count

  • 1

Other Profiles

International Standard Serial Number (ISSN)

  • 0034-4885

Electronic International Standard Serial Number (EISSN)

  • 1361-6633

Additional Document Info

start page

  • 127801

end page

  • 127801

volume

  • 88

issue

  • 12