The anomalous $Wtb$ vertex and top-pair production at the LHC

TL;DR

This paper investigates the anomalous $Wtb$ vertex in top-quark interactions at the LHC, setting bounds on new physics couplings using current and projected collider data, with implications for future collider experiments.

Contribution

It provides the first comprehensive analysis of $Wtb$ anomalous couplings using multiple observables and projects bounds for future high-luminosity colliders.

Findings

Current bounds on $(|C_L|, |C_R|)$ are approximately (1.82, 0.03) $ imes 10^{-4}$ at 2.5$\sigma$ CL.

Future colliders could improve bounds to $(0.21, 0.0004) imes 10^{-4}$ at 2.5$\sigma$ CL.

The study combines decay width, cross-section, and asymmetry measurements for a robust analysis.

Abstract

We perform an exclusive study of the anomalous $Wtb$ interaction in the context of LHC. The limits on $Wtb$ anomalous couplings have been estimated via the measurements of the top-quark decay width and cross-section as well as production asymmetries in case the CP is violated. Our investigations reveal that the upper bounds on $(|C_L|, |C_R|)$ would be of about (1.82, 0.03) $\times 10^{-4}$ at $2.5 \sigma$ C.L., for the already collected data at the LHC with $\sqrt{S} = 13$ TeV for an integrated luminosity of 139 fb$^{-1}$. The corresponding limits for future hadron colliders, namely, High Luminosity LHC (HL-LHC), High Energy LHC (HE-LHC) and Future Circular Collider (FCC-hh) for the projected luminosities of 3 ab$^{-1}$, 12 ab$^{-1}$ and 30 ab$^{-1}$ are found to be to $(0.81, 0.006)\times 10^{-4}$, $(0.44, 0.0017)\times 10^{-4}$ and $(0.21, 0.0004)\times 10^{-4}$ respectively at 2.5$\sigma$ C. L..