Search for pair production of the heavy vectorlike top partner in same-sign dilepton signature at the HL-LHC

Abstract

New vectorlike quarks are predicted in many new physics scenarios beyond the Standard Model~(SM) and could potentially be discovered at the LHC. Based on a simplified model including a singlet vectorlike top partner with charge $2/3$, we investigate the process $pp\to TT$ via a $t$-channel induced by the couplings between the top partner with the first-generation SM quarks. We calculate the production cross section and further study the observability of the heavy top partner in the channel $T\to Wq$ at the high-luminosity LHC (HL-LHC) using final states with same-sign dileptons (electrons or muons), two jets, and missing transverse momentum. At the 14 TeV LHC with an integrated luminosity of 3000 fb${}^{-1}$, the $2\sigma$ exclusion limits, as well as the $5\sigma$ discovery reach in the parameter plane of the two variables $g^{\ast }-R_L$, are respectively obtained at the HL-LHC. We also obtain the $2\sigma$ exclusion limit on the coupling strength parameter $g^{\ast }$ in the case in which the vectorlike top partner is coupled only to the first-generation quarks.

16 pages, 6 figures, version in PRD

References in corpus (24)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Pileup subtraction using jet areas
• MadAnalysis 5, a user-friendly framework for collider phenomenology
• Next-to-leading order QCD predictions for W+W+jj production at the LHC
• Particle-level pileup subtraction for jets and jet shapes
• Bounds and Decays of New Heavy Vector-like Top Partners
• QCD next-to-leading-order predictions matched to parton showers for vector-like quark models
• Addressing the CKM Unitarity Problem with a Vector-like Up Quark
• Interpreting the $W$-mass anomaly in the vectorlike quark models
• Joint analysis of Higgs decays and electroweak precision observables in the Standard Model with a sequential fourth generation
• Extending Higgs Inflation with TeV Scale New Physics
• Search for single production of a vector-like $T$ quark decaying into a Higgs boson and top quark with fully hadronic final states using the ATLAS detector
• Exotic Vector-Like Quark Phenomenology in the Minimal Linear $\sigma$ Model
• Search for single production of the vector-like top partner at the 14 TeV LHC
• Phenomenology of unusual top partners in composite Higgs models
• Search for single production of the heavy vectorlike $T$ quark with $T\to th$ and $h\to \gamma \gamma$ at the high-luminosity LHC
• Search for single production of a top quark partner via the $T\to th$ and $h\to W{W}^{\ast }$ channels at the LHC
• Discovery prospects of a vectorlike top partner decaying to a singlet boson
• Asymmetry in flavour changing electromagnetic transitions of vector-like quarks
• Broad toplike vector quarks at LHC and HL-LHC
• Discovery potential for $T^{\prime }\to tZ$ in the trilepton channel at the LHC
• Search for single production of vectorlike $B$-quarks at the LHC
• Probing a new decay of vector-like top partner mediated by heavy Majorana neutrino via single production

Cited by in corpus (6)

• Vector-like Singlet Quarks: a Roadmap
• Global Fit of Modified Quark Couplings to EW Gauge Bosons and Vector-Like Quarks in Light of the Cabibbo Angle Anomaly
• Pair production of the singlet vector-like B quark at the CLIC
• Search for the singlet vector-like top quark in the $T\to tZ$ channel with $Z\to \nu \bar{\nu }$ at hadron colliders
• Exploring vector-like $B$-quark pair production at CLIC in fully hadronic final states
• Searching for single production of vectorlike quarks decaying into Wb at a future muon-proton collider