Search for heavy pseudoscalar and scalar bosons decaying to a top quark pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

A search for pseudoscalar or scalar bosons decaying to a top quark pair ($\mathrm{t}\bar{\mathrm{t}}$) 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 $m_{\mathrm{t}\bar{\mathrm{t}}}$ of the reconstructed $\mathrm{t}\bar{\mathrm{t}}$ system and variables sensitive to its spin and parity are used to discriminate against the standard model $\mathrm{t}\bar{\mathrm{t}}$ background. Interference between pseudoscalar or scalar boson production and the standard model $\mathrm{t}\bar{\mathrm{t}}$ continuum is included, leading to peak-dip structures in the $m_{\mathrm{t}\bar{\mathrm{t}}}$ distribution. An excess of the data above the background prediction, based on perturbative quantum chromodynamics (QCD) calculations, is observed near the kinematic $\mathrm{t}\bar{\mathrm{t}}$ production threshold, while good agreement is found for high $m_{\mathrm{t}\bar{\mathrm{t}}}$. The data are consistent with the background prediction if the contribution from the production of a color-singlet ${}^1{\mathrm{S}}_0^{[1]}$ $\mathrm{t}\bar{\mathrm{t}}$ quasi-bound state ${\eta }_{\mathrm{t}}$, predicted 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 ${\eta }_{\mathrm{t}}$ contribution.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-22-013 (CMS Public Pages)

References in corpus (100)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Asymptotic formulae for likelihood-based tests of new physics
• A Unified Approach to the Classical Statistical Analysis of Small Signals
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Theory and phenomenology of two-Higgs-doublet models
• Parton distributions for the LHC Run II
• Matching NLO QCD computations and parton shower simulations
• Confidence Level Computation for Combining Searches with Small Statistics
• PDF4LHC recommendations for LHC Run II
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• HIGGS BOSON PRODUCTION AT THE LHC
• Particle-flow reconstruction and global event description with the CMS detector
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• The CMS trigger system
• Single-top Wt-channel production matched with parton showers using the POWHEG method
• Merging meets matching in MC@NLO
• -- HATHOR -- HAdronic Top and Heavy quarks crOss section calculatoR
• Observation of a new boson with mass near 125 GeV in pp collisions at sqrt(s) = 7 and 8 TeV
• MCFM for the Tevatron and the LHC
• Electroweak gauge boson production at hadron colliders through O(alpha_s^2)
• Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
• Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
• NLO single-top production matched with shower in POWHEG: s- and t-channel contributions
• Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at $\sqrt{s}=$ 13 TeV
• 2HDMC - Two-Higgs-Doublet Model Calculator
• Combined measurements of Higgs boson couplings in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements
• SusHi: A program for the calculation of Higgs production in gluon fusion and bottom-quark annihilation in the Standard Model and the MSSM
• Combining QCD and electroweak corrections to dilepton production in FEWZ
• HATHOR for single top-quark production: Updated predictions and uncertainty estimates for single top-quark production in hadronic collisions
• String Formation Beyond Leading Colour
• Simplified Models for Dark Matter Searches at the LHC
• $W^{+}{W}^{-}$ production at hadron colliders in NNLO QCD
• Fully differential NNLO computations with MATRIX
• Performance of the CMS Level-1 trigger in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Precision luminosity measurement in proton-proton collisions at $\sqrt{s}=$ 13 TeV in 2015 and 2016 at CMS
• Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC
• Top quark pair production and decay at hadron colliders
• Performance of missing transverse momentum reconstruction in proton-proton collisions at $\sqrt{s}=$ 13 TeV using the CMS detector
• Distributions and correlations for top quark pair production and decay at the Tevatron and LHC.
• Measurement of the differential cross section for top quark pair production in pp collisions at sqrt(s) = 8 TeV
• Jet Flavour Classification Using DeepJet
• SusHi Bento: Beyond NNLO and the heavy-top limit
• Measurement of the top quark mass using proton-proton data at sqrt(s) = 7 and 8 TeV
• Top-pair production and decay at NLO matched with parton showers
• Pileup mitigation at CMS in 13 TeV data
• Electroweak effects in top-quark pair production at Hadron Colliders
• Higgs Decay to Top Quarks at Hadron Colliders
• Weak interaction corrections to hadronic top quark pair production
• Spin Correlation Effects in Top Quark Pair Production at the LHC
• Top-quark pair production near threshold at LHC
• The CMS statistical analysis and combination tool: COMBINE
• Electroweak corrections to top-quark pair production in quark--antiquark annihilation
• Improved tests of entanglement and Bell inequalities with LHC tops
• Measurement of the t t-bar production cross section and the top quark mass in the dilepton channel in pp collisions at sqrt(s) =7 TeV
• Weak Interactions in Top-Quark Pair Production at Hadron Colliders: An Update
• Measurement of the $t\bar{t}Z$ and $t\bar{t}W$ cross sections in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• MiNNLO${}_{\text{PS}}$: A new method to match NNLO QCD to parton showers
• Signatures of Higgs Bosons in the Top Quark Decay Channel at Hadron Colliders
• Search for heavy Higgs bosons $A/H$ decaying to a top quark pair in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Phenomenological Comparison of Models with Extended Higgs Sectors
• Search for heavy Higgs bosons decaying to a top quark pair in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Mixed QCD and weak corrections to top quark pair production at hadron colliders
• Measurement of the cross section for top quark pair production in association with a W or Z boson in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• MiNNLO${}_{\mathrm{PS}}$: Optimizing $2\to 1$ hadronic processes
• A comprehensive approach to dark matter studies: exploration of simplified top-philic models
• A set of top quark spin correlation and polarization observables for the LHC: Standard Model predictions and new physics contributions
• Measurement of the inclusive cross-sections of single top-quark and top-antiquark $t$-channel production in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Measurement of double-differential cross sections for top quark pair production in pp collisions at sqrt(s) = 8 TeV and impact on parton distribution functions
• Higher-order corrections for $tW$ production at high-energy hadron colliders
• Challenges and opportunities for heavy scalar searches in the $t\bar{t}$ channel at the LHC
• Signatures of toponium formation in LHC run 2 data
• Analytical solution of ttbar dilepton equations
• Probing pseudo-Goldstone dark matter at the LHC
• Measurement of the production cross section for single top quarks in association with W bosons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Production of heavy Higgs bosons and decay into top quarks at the LHC
• Measurement of the single top quark and antiquark production cross sections in the $t$ channel and their ratio in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Signal background interference effects in heavy scalar production and decay to a top-anti-top pair
• Performance of the CMS high-level trigger during LHC Run 2
• Analytic solutions for neutrino momenta in decay of top quarks
• Measurements of top-quark pair to $Z$-boson cross-section ratios at $\sqrt{s}=13,8,7$TeV with the ATLAS detector
• Bound-state effects on kinematical distributions of top quarks at hadron colliders
• Top quark pair production near threshold: single/double distributions and mass determination
• Observation of a pseudoscalar excess at the top quark pair production threshold
• Interference Effects in $t\bar{t}$ Production at the LHC as a Window on New Physics
• Simulating toponium formation signals at the LHC
• Search for heavy neutral Higgs bosons decaying into a top quark pair in 140 fb${}^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV with the ATLAS detector
• CMS PYTHIA 8 colour reconnection tunes based on underlying-event data
• Production of heavy Higgs bosons and decay into top quarks at the LHC. II: Top-quark polarization and spin correlation effects
• Higgs interference effects in top-quark pair production in the 1HSM
• Reconstructing top quark-antiquark events with one lost jet

Cited by in corpus (5)

• Prospects for observing the ${\eta }_t$ $\to$ $W^{+}{W}^{-}$ decay at the HL-LHC
• Possible mixing between elementary and bound state fields in the $t\bar{t}$ production excess at the LHC
• Constraining $A\to ZH$ with $H\to t\bar{t}$ in the Low-Mass Region
• NNLO QCD corrections to $\gamma \gamma \to Q\bar{Q}$ from Local Unitarity combined with Coulomb resummation and NLO EW effects
• Investigating topped hadrons to probe the boundaries of the potential model