Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high $p_T$
COMPASS Collaboration, C. Adolph, R. Akhunzyanov, M. Alexeev et autres
We measured the longitudinal double spin asymmetries $A_{LL}$ for single hadron muo-production off protons and deuterons at photon virtuality $Q^2$ < 1(GeV/$\it c$)$^2$ for transverse hadron momenta $p_T$ in the range 0.7 GeV/$\it c$ to 4 GeV/$\it c$ . They were determined …