Single production of an exotic vector-like Y quark at future high energy pp colliders

Abstract

Vector-like quarks have been predicted in various new physics scenarios beyond the Standard Model (SM). In a simplified modelling of a (B,Y) doublet including a vector-like quark Y, with charge −43e, there are only two free parameters: the Y coupling κY and mass mY. In the five flavor scheme, we investigate the single production of the Y state decaying into Wb at the Large Hadron Collider (LHC) Run-III and High-Luminosity LHC (HL-LHC) operating at s√ = 14 TeV, the possible High-Energy LHC (HE-LHC) with s√ = 27 TeV as well as the Future Circular Collider in hadron-hadron mode (FCC-hh) with s√ = 100 TeV. Through detailed signal-to-background analyses and detector simulations, we assess the exclusion capabilities of the Y state at the different colliders. We find that this can be improved significantly with increasing collision energy, especially at the HE-LHC and FCC-hh, both demonstrating an obvious advantage with respect to the HL-LHC case in the case of high mY. Assuming a 10% systematic uncertainty on the background event rate, the exclusion capabilities are summarized as follows: (1) the LHC Run-III can exclude the correlated regions of κY∈[0.044,0.5] and mY∈[1000 GeV,3099 GeV] with integrated luminosity L=300 fb−1; (2) the HL-LHC can exclude the correlated regions of κY∈[0.027,0.5] and mY∈[1000 GeV,3653 GeV] with L=3 ab−1; (3) the HE-LHC can exclude the correlated regions of κY∈[0.030,0.5] and mY∈[1000 GeV,4936 GeV] with L=3 ab−1; (4) the FCC-hh can exclude the correlated regions of κY∈[0.051,0.5] and mY∈[1000 GeV,6610 GeV] with L=3 ab−1.

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ORCID for Stefano Moretti: orcid.org/0000-0002-8601-7246

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