Search for pair production of heavy resonances in final states with a photon and large-radius jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

A search for the pair production of heavy spin-1/2 or spin-3/2 resonances (t${}^{\ast }$) in proton-proton collisions at $\sqrt{s}$ = 13 TeV is presented. Data collected with the CMS detector at the CERN LHC from 2016 to 2018 corresponding to an integrated luminosity of 138 fb${}^{-1}$ are used. The analysis targets benchmark signal scenarios where one t${}^{\ast }$ decays into a top quark (t) and a photon ($\gamma$), and the other into a t quark and a gluon (g), i.e., pp $\to$ t${}^{\ast }{\bar{\mathrm{t}}}^{\ast }$ $\to$ tt$\gamma$g. All-hadronic final states from the t pair decay chain are selected using jet substructure techniques. The signal is probed as a function of the t${}^{\ast }$ candidate mass, which is reconstructed using the photon and a top quark candidate jet. No significant deviation from the background-only hypothesis is found. Observed (expected) upper limits on the signal cross section at 95% confidence level are set, excluding masses of spin-1/2 t${}^{\ast }$ particles below 930 (930) GeV and spin-3/2 t${}^{\ast }$ particles below 1330 (1390) GeV. This analysis marks the first search for heavy resonances in the $\mathrm{t}\bar{\mathrm{t}}\gamma$g channel. Exploiting the high-energy photon to reduce the backgrounds, this search achieves sensitivity competitive with pp $\to$ t${}^{\ast }{\bar{\mathrm{t}}}^{\ast }$ $\to$ $\mathrm{t}\bar{\mathrm{t}}$gg searches for spin-1/2 t${}^{\ast }$ despite the small expected t${}^{\ast }$ $\to$ t$\gamma$ branching fraction.

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/B2G-24-006 (CMS Public Pages)

References in corpus (56)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The Hierarchy Problem and New Dimensions at a Millimeter
• 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 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
• Parton distributions from high-precision collider data
• Jet substructure as a new Higgs search channel at the LHC
• Particle-flow reconstruction and global event description with the CMS detector
• The CMS trigger system
• Soft Drop
• Merging meets matching in MC@NLO
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
• Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at sqrt(s) = 8 TeV
• Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Towards an understanding of jet substructure
• Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements
• ParticleNet: Jet Tagging via Particle Clouds
• Pileup Per Particle Identification
• 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
• Measurement of the Inclusive W and Z Production Cross Sections in pp Collisions at sqrt(s) = 7 TeV
• Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC
• Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at sqrt(s) = 8 TeV
• A First Top Partner Hunter's Guide
• Measurement of the inelastic proton-proton cross section at $\sqrt{s}=$ 13 TeV
• Search for resonant and nonresonant new phenomena in high-mass dilepton final states at $\sqrt{s}=$ 13 TeV
• Pileup mitigation at CMS in 13 TeV data
• The CMS statistical analysis and combination tool: COMBINE
• Beyond the Minimal Top Partner Decay
• Search for pair production of vector-like quarks in the bW$\overline{\mathrm{b}}$W channel from proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Common exotic decays of top partners
• Performance of the reconstruction and identification of high-momentum muons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Signatures of vector-like top partners decaying into new neutral scalar or pseudoscalar bosons
• Discovering the composite Higgs through the decay of a heavy fermion
• Performance of the CMS high-level trigger during LHC Run 2
• Search for pair production of vector-like quarks in leptonic final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for electroweak production of a vector-like T quark using fully hadronic final states
• Search for pair-production of vector-like quarks in $pp$ collision events at $\sqrt{s}=13$ TeV with at least one leptonically decaying $Z$ boson and a third-generation quark with the ATLAS detector
• Search for pair-produced vector-like top and bottom partners in events with large missing transverse momentum in pp collisions with the ATLAS detector
• Search for single production of a vector-like T quark decaying to a top quark and a Z boson in the final state with jets and missing transverse momentum at $\sqrt{s}=$ 13 TeV
• Shedding Light on Top Partner at the LHC
• Six Top Messages of New Physics at the LHC
• Search for a vector-like quark T${}^{\prime }$ $\to$ tH via the diphoton decay mode of the Higgs boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for pair production of excited top quarks in the lepton + jets final state
• Search for pair production of excited top quarks in the lepton+jets final state
• Search for singly produced vector-like top partners in multilepton final states with 139 ${\mathrm{fb}}^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for production of a single vector-like quark decaying to tH or tZ in the all-hadronic final state in pp collisions at $\sqrt{s}$ = 13 TeV
• Measurement of the inclusive and differential $\mathrm{t}\bar{\mathrm{t}}\gamma$ cross sections in the dilepton channel and effective field theory interpretation in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Observation of Single-Top-Quark Production in Association with a Photon Using the ATLAS Detector
• Search for pair production of heavy particles decaying to a top quark and a gluon in the lepton+jets final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for W$\gamma$ resonances in proton-proton collisions at $\sqrt{s}=$ 13 TeV using hadronic decays of Lorentz-boosted W bosons