Exploring universality of transversity in p-p collisions

TL;DR

This paper investigates the universality of the transversity distribution by analyzing recent proton-proton collision data, comparing it with previous deep-inelastic scattering results, and exploring the underlying mechanisms of spin asymmetries.

Contribution

It provides new insights into the universality of transversity distributions by analyzing recent experimental data from proton-proton collisions and comparing it with established results from deep-inelastic scattering.

Findings

Observation of transverse-spin asymmetry in p-p collisions

Consistent transversity extraction across different processes

Implications for the universality of transversity distributions

Abstract

The transversity distribution was recently extracted from deep-inelastic scattering processes producing hadron pairs in the final state. Together with a specific chiral-odd di-hadron fragmentation function, it is involved in the elementary mechanism that generates a transverse-spin asymmetry in the azimuthal distribution of the detected hadron pairs. The same elementary mechanism was predicted to generate an analogous asymmetry when the hadron pairs are produced in proton-proton collisions with one transversely polarized proton. Recently, the STAR Collaboration has observed this asymmetry. We analyze the impact of these data on our knowledge of transversity.