Abstract
The Deep Inelastic Scattering (DIS) proved to be a great tool in testing of the theory of strong interactions, which was a major focus in last decades. Semi-Inclusive DIS (SIDIS), with detection of an additional hadron allowed first studies of 3D structure of the nucleon, moving the main focus from testing the QCD to understanding of strong interactions and quark gluon dynamics to address a number of puzzles accumulated in recent years. Detection of two hadrons in SIDIS, which is even more complicated, provides access to details of quark gluon interactions inaccessible in single-hadron SIDIS, providing a new avenue to study the complex nucleon structure. Large acceptance of the Electron Ion Collider, allowing detection of two hadrons, produced back-to-back in the current and target fragmentation regions, combined with clear separation of two regions, would provide a unique possibility to study the nucleon structure in target fragmentation region, and correlations of target and current fragmentation regions.
Highlights
EPJ Web of Conferences [23,24,25,26] indicate that spin orbit correlations may be significant for certain combinations of spins of quarks and nucleons and transverse momentum of scattered quarks
Much higher Q2 range accessible at JLab12 with CLAS12 and Electron Ion Collider (EIC) would allow for studies of Q2-dependence of different higher twist spin-azimuthal asymmetries, which, apart from providing important information on quark-gluon correlations are needed for understanding of possible corrections from higher twists to leading twist observables
Measurements of single-spin asymmetries indicate that spin-orbit correlations may play an important role in description of the structure of nucleon in terms of elementary quarks and gluons going beyond the simple collinear partonic representation
Summary
EPJ Web of Conferences [23,24,25,26] indicate that spin orbit correlations may be significant for certain combinations of spins of quarks and nucleons and transverse momentum of scattered quarks. Large spin-azimuthal asymmetries have been observed at JLab for longitudinally polarized beam [6] and transversely polarized target [27], consistent with corresponding measurements at HERMES [28] and COMPASS [29], which have been interpreted in terms of higher twist contributions, related to quark-gluon correlations. Dihadron production in SIDIS requires higher energies and Q2, than single hadron SIDIS, measurements of double-spin asymmetries at CLAS are already at 5.7GeV compatible with simple leading twist predictions for equality of double spin asymmetries in eX,eπ+π−X, and eπ0X, assuming the sea quark contributions are negligible at large xB and fragmentation functions sum of charged pions are flavor independent. The large acceptance of the EIC (see Fig. 4) would provide a unique possibility to study the nucleon structure in the target fragmentation region
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