Explore the Nucleon Tomography through Di-hadron Correlation in Opposite Hemisphere in Deep Inelastic Scattering

TL;DR

This paper explores nucleon tomography through di-hadron correlations in deep inelastic scattering, revealing how final state interactions influence spin asymmetries and providing insights into nucleon structure.

Contribution

It introduces a novel analysis of di-hadron correlations in different fragmentation regions to probe nucleon tomography and highlights the role of final state interactions in spin asymmetries.

Findings

Final state interactions cause nonzero longitudinal polarized quark distributions.

Beam single spin asymmetry (BSA) observed in experiments is explained.

BSA persists in target fragmentation region despite kinematic suppression.

Abstract

We investigate the correlation of di-hadron productions between the current fragmentation region (CFR) and target fragmentation region (TFR) in deep inelastic scattering as a probe of the nucleon tomography. The QCD factorization and powering counting method are applied to compute the relevant diffractive parton distribution functions in the valence region. In particular, we show that the final state interaction effects lead to a nonzero longitudinal polarized quark distribution associated with the unpolarized nucleon target. This explains the observed beam single spin asymmetry (BSA) from a recent Jefferson Lab experiment. We further show that the BSA in the single diffractive hadron productions in the TFR, although kinematically suppressed, also exists because of the final state interaction effects.