Impact of Colliding Beams Helicity on the Production of Leptoquarks and Collider Experimental Parameters

TL;DR

This paper evaluates how colliding beams helicity affects vector leptoquark production at future linear colliders, highlighting polarization as a key factor in maximizing signals and discriminating new physics.

Contribution

It provides a detailed analysis of beam polarization effects on VLQ production, optimizing collider parameters for enhanced discovery potential and systematic error reduction.

Findings

Longitudinal polarization significantly boosts signal sensitivity.

Optimal beam helicity configurations maximize production cross-sections.

Left-Right Asymmetry effectively discriminates chiral structures.

Abstract

Vector Leptoquarks (VLQs) have emerged as primary candidates for resolving discrepancies in the Standard Model, specifically within $B$-meson decay channels and the anomalous magnetic moment of the muon. This work presents a rigorous evaluation of VLQ pair production across $e^{-}e^{+}$ collision modes at future linear colliders with center-of-mass energies ranging from 14~TeV to 100~TeV. Our analysis demonstrates that longitudinal beam polarization is a transformative tool for enhancing signal sensitivity. We find that $e^{-}e^{+}$ annihilation consistently yields superior cross-sections compared to photon fusion processes across a mass range of 500--3000~GeV. By optimizing beam helicity to specific configurations, such as $P_{e^{-}} = -0.8$ and $P_{e^{+}} = +0.6$, the production cross-section can be maximized to 120~fb at $\sqrt{s} = 3$~TeV. We further establish that the Left-Right Asymmetry ($A_{LR}$) serves as a robust discriminator for the chiral structure of new physics, peaking at 0.16 under full polarization. Additionally, we show that effective luminosity can be enhanced to 95\% of the total luminosity, while high polarization degrees significantly suppress relative uncertainties in the effective polarization. These results provide a quantitative roadmap for optimizing discovery potential and minimizing systematic errors in future high-energy physics experiments.