Renormalization group improved predictions for $t\bar{t}W^\pm$ production at hadron colliders

TL;DR

This paper applies soft-collinear effective theory to improve predictions for $t\bar{t}W^{\pm}$ production at hadron colliders by performing next-to-next-to-leading logarithm resummation, reducing scale dependence and increasing cross section estimates.

Contribution

It introduces a next-to-leading order soft function calculation and NNLL resummation for $t\bar{t}W^{\pm}$ production, enhancing theoretical accuracy.

Findings

Resummation reduces scale dependence significantly.

Total cross section increases by 7-13% over NLO results.

Improved theoretical predictions for collider experiments.

Abstract

We study the factorization and resummation of the $t\bar{t}W^\pm$ production at hadron colliders. The cross section in the threshold limit can be factorized into a convolution of hard and soft functions and parton distribution functions with the soft-collinear effective theory. We calculate the next-to-leading order soft function for the associated production of the heavy quark pair and colorless particle, and we perform the resummation calculation with the next-to-next-to-leading logarithms accuracy. Our results show that the resummation effects reduce the dependence of the cross section on the scales significantly and increase the total cross section by $7-13\%$ compared with NLO QCD results.