Novel experimental probes of QCD in SIDIS and $e^+e^-$ annihilation

TL;DR

This paper explores new experimental methods using di-hadron correlations and hyperon polarization in SIDIS and e+e- annihilation to gain deeper insights into QCD and nucleon structure, leveraging complex final state correlations.

Contribution

It introduces novel probes involving di-hadron correlations and hyperon polarization to study QCD phenomena in SIDIS, pp, and e+e- processes, expanding beyond traditional scalar hadron distributions.

Findings

Recent results demonstrate the potential of di-hadron correlations in nucleon structure studies.

Hyperon polarization provides new insights into hadronization mechanisms.

Future experiments at JLab and Belle II will utilize these probes to explore QCD more comprehensively.

Abstract

Semi-inclusive deep inelastic Scattering (SIDIS) has been a very successful tool to investigate the partonic structure of the nucleon over the last decade. Compared to inclusive DIS, information about the quantum numbers of the struck quark can be inferred from the identity, distribution and polarization of the final state hadrons. Up to now, virtually all knowledge about the quark-gluon structure of the nucleon from SIDIS has been gained from distributions of independently observed scalar hadrons. However, given the amount of data current and future experiments at JLab, RHIC, KEK and the EIC will collect, new paradigms have to be explored to leverage the statistical power of the data. Similar to other felds in nuclear and particle physics, it is natural to move towards the exploration of more complex correlations in the observed fi nal state. This contribution will discuss recent results and future prospects of using di-hadron correlations and polarized hyperon probes to study QCD in SIDIS, pp and e+e- annihilation. Both of these probes exploit additional degrees of freedom in the final state, given by the relative momentum of the di-hadron pair and the hyperon polarization, respectively. This contribution will focus on recent results and opportunities opened by these probes to study nucleon structure, hadronization and QCD in novel ways. The focus will be on planned SIDIS measurements at CLAS12 at JLab and e+e- at Belle II.