Asymmetries involving dihadron fragmentation functions: from DIS to e+e- annihilation

TL;DR

This paper models dihadron fragmentation functions to analyze spin asymmetries in DIS and predicts angular correlations in e+e- annihilation, offering an alternative method to extract quark transversity distributions.

Contribution

It introduces a model-based approach to connect dihadron fragmentation functions across DIS and e+e- processes, enabling transversity extraction without relying solely on Collins effect.

Findings

Fit HERMES spin asymmetry data with dihadron fragmentation functions.

Predict angular correlations in e+e- annihilation at BELLE.

Suggests combined measurements as an alternative to Collins effect.

Abstract

Using a model calculation of dihadron fragmentation functions, we fit the spin asymmetry recently extracted by HERMES for the semi-inclusive pion pair production in deep-inelastic scattering on a transversely polarized proton target. By evolving the obtained dihadron fragmentation functions, we make predictions for the correlation of the angular distributions of two pion pairs produced in electron-positron annihilations at BELLE kinematics. Our study shows that the combination of two-hadron inclusive deep-inelastic scattering and electron-positron annihilation measurements can provide a valid alternative to Collins effect for the extraction of the quark transversity distribution in the nucleon.