Dihadron fragmentation functions for large invariant mass

TL;DR

This paper calculates dihadron fragmentation functions at large invariant mass using perturbative QCD, highlighting the interference fragmentation function's role in spin physics and its relation to the Collins function, with implications for semi-inclusive deep-inelastic scattering.

Contribution

It provides a perturbative QCD calculation of dihadron fragmentation functions at large invariant mass, linking interference fragmentation and Collins functions, and compares factorization approaches in SIDIS.

Findings

H_1^{ ext{open}} and Collins functions share underlying dynamics

Collinear factorization yields consistent results in the intermediate mass region

Perturbative calculations clarify the role of dihadron fragmentation in spin physics

Abstract

Using perturbative Quantum Chromodynamics, we compute dihadron fragmentation functions for a large invariant mass of the dihadron pair. The main focus is on the interference fragmentation function $H_1^{\open}$, which plays an important role in spin physics of the nucleon. Our calculation also reveals that $H_1^{\open}$ and the Collins fragmentation function have a closely related underlying dynamics. By considering semi-inclusive deep-inelastic scattering, we further show that collinear factorization in terms of dihadron fragmentation functions, and collinear factorization in terms of single hadron fragmentation functions provide the same result in the region of intermediate invariant mass.