Refined analysis and updated constraints on general non-standard tbW couplings

TL;DR

This paper refines the analysis of non-standard tbW couplings using an improved GPU-based computational method, providing more precise constraints based on recent experimental data.

Contribution

It introduces a GPU-accelerated computational approach to re-analyze and update constraints on non-standard tbW couplings with higher precision.

Findings

Previous analysis was reliable despite limited computation.

Updated constraints are more precise with new data.

GPU method enhances analysis accuracy.

Abstract

We recently studied possible non-standard tbW couplings based on the effective-Lagrangian which consists of four kinds of SU(3) x SU(2) x U(1) invariant dimension-6 effective operators and gave an experimentally allowed region for each non-standard coupling. We here re-perform that analysis much more precisely based on the same experimental data but on a new computational procedure using the Graphics-Processing-Unit (GPU) calculation system. Comparing these two analyses with each other, the previous one is found to have given quite reliable results despite of its limited computation capability. We then apply this new procedure to the latest data and present updated results.