The Role of Incident Parton Transverse Momenta in Heavy Quark Hadroproduction

TL;DR

This paper discusses the importance of including incident parton transverse momenta in heavy quark hadroproduction models, especially for two-particle correlations where collinear approximation fails.

Contribution

It explores various methods to incorporate initial parton transverse momenta beyond the collinear approximation in heavy quark production.

Findings

Collinear approximation is insufficient for two-particle correlations.

Including transverse momenta improves the description of correlations.

Different approaches to account for parton transverse momenta are analyzed.

Abstract

The conventional NLO parton model is enough for the description of total cross sections and one-particle distributions. In the case of two-particle correlations, the collinear approximation has failed, and it is necessary to account for the transverse momenta of initial partons. The different possibilities to do this are discussed.