Polarized Single Top Quark Production in e\gamma Collision and Anomalous Wtb Couplings

TL;DR

This paper explores how polarized eγ collisions can be used to detect anomalous Wtb couplings through single top quark production, providing improved sensitivity limits at various energies and luminosities.

Contribution

It introduces a method to probe anomalous Wtb couplings using polarized eγ collisions and quantifies the sensitivity improvements due to top quark polarization.

Findings

95% confidence level limits on F_{2L} and F_{2R} couplings

Polarization significantly enhances sensitivity to anomalous couplings

Sensitivity limits vary with energy and luminosity

Abstract

We investigate the potential of $e\gamma$ collisions to probe anomalous $Wtb$ couplings via the polarized single top quark production process $e^{+} \gamma \to t \bar{b} \bar{\nu_{e}}$. We find 95% confidence level limits on the anomalous coupling parameters $F_{2L}$ and $F_{2R}$ with an integrated luminosity of $500 fb^{-1}$ and $\sqrt{s}=0.5, 1$ and 1.5 TeV energies. The effects of top quark spin polarization on the anomalous $Wtb$ couplings are discussed. It is shown that polarization leads to a considerable improvement in the sensitivity limits.