Single Production of Vectorlike Y Quarks at the HL-LHC

TL;DR

This paper investigates the potential to discover or constrain the single production of vectorlike Y quarks with charge 4/3 at the HL-LHC, focusing on their decay via W bosons and analyzing signal versus background for various masses and couplings.

Contribution

It provides a detailed simulation-based analysis of the sensitivity to vectorlike Y quark production at the HL-LHC, including cross sections, backgrounds, and parameter estimations for different masses and couplings.

Findings

Sensitivity estimates for Y quark masses 1000-2500 GeV at HL-LHC.

Cross section calculations for signal and background processes.

Projected limits for different coupling strengths and luminosities.

Abstract

We study single production of exotic vectorlike $Y$ quark with electric charge $|Q_{Y}|=4/3$ and its subsequent decay at the High Luminosity LHC (HL-LHC). Most of the vector like quark (VLQ) decays have the electroweak $W$ bosons in the intermediate state. Besides their direct productions singly or pairs, the $W$-bosons are involved in decay chains as a result of the decay of a top quark which contributes to the background. This is particularly the case since vectorlike $Y$ quark, which is estimated to be produced with a high cross-section, can only decay via a $W$ boson and a down type quark ($d,s,b$). We calculate the cross sections of signal (for different couplings and mass values) and relevant Standard Model (SM) backgrounds. After a fast simulation of signal and background events, estimations of the sensitivity to the parameters (mass range 1000-2500 GeV for coupling value $\kappa_{Y}=0.5$, and mass range 500-2000 GeV for coupling values $\kappa_{Y}=0.3$ and $\kappa_{Y}=0.15$) have been presented at the HL-LHC with center of mass energy $\sqrt{s}=14$ TeV and integrated luminosity projections of 300 fb$^{-1}$, 1000 fb$^{-1}$ and 3000 fb$^{-1}$.