Accessing gluon polarization with high- hadrons in SIDIS
arXiv:2210.12295 · doi:10.1103/PhysRevD.107.034033
The paper proposes using double longitudinal spin asymmetries in semi‑inclusive deep‑inelastic scattering with high‑P_T hadrons to probe the gluon helicity distribution in the proton and identifies kinematic regions for future Jefferson Lab and Electron‑Ion Collider measurements that can distinguish between positive and negative Δg solutions.
Abstract
A recent global QCD analysis of jet production and other polarized scattering data has found the presence of negative solutions for the gluon helicity distribution in the proton, , along with the traditional solutions. We consider polarized semi-inclusive deep-inelastic scattering for hadrons produced with large transverse momentum as a means of constraining the dependence of on the parton momentum fraction, . Focusing on the double longitudinal spin asymmetry, we identify the kinematics relevant for future experiments at Jefferson Lab and the Electron-Ion Collider which are particularly sensitive to the polarized gluon channel and could discriminate between the different behaviors.
22 pages, 7 figures