A new subtraction scheme at NLO exploiting the privilege of kT-factorization

TL;DR

This paper introduces a novel subtraction scheme for NLO calculations in hybrid kT-factorization, focusing on initial-state momentum recoil subtraction to improve accuracy in real-radiation integrals.

Contribution

It proposes a new subtraction method that differs from traditional approaches by subtracting recoil from initial-state momenta in NLO calculations within kT-factorization.

Findings

Effective handling of initial-state recoil in NLO calculations

Improved accuracy in real-radiation integral computations

Potential for better theoretical predictions in high-energy processes

Abstract

We present a subtraction method for the calculation of real-radiation integrals at NLO in hybrid kT-factorization. The main difference with existing methods for collinear factorization is that we subtract the momentum recoil, occurring due to the mapping from an (n+1)-particle phase space to an n-particle phase space, from the initial-state momenta, instead of distributing it over the final-state momenta.