Spin Asymmetry in Muon--Proton Deep Inelastic Scattering on a Transversely-Polarized Target

The Spin Muon Collaboration

doi:10.1016/0370-2693(94)00968-6

paper

Spin Asymmetry in Muon--Proton Deep Inelastic Scattering on a Transversely-Polarized Target

arXiv:hep-ex/9408001 · doi:10.1016/0370-2693(94)00968-6

Abstract

We measured the spin asymmetry in the scattering of 100 GeV longitudinally-polarized muons on transversely polarized protons. The asymmetry was found to be compatible with zero in the kinematic range $0.006 < x < 0.6$ , $1<Q^2<30\,~\mbox{GeV}^2$. {}From this result we derive the upper limits for the virtual photon--proton asymmetry $A_{2}$ , and for the spin structure function $g_{2}$ . For $x < 0.15$ , $A_{2}$ is significantly smaller than its positivity limit $R$ .

10 pages CERN-PPE/94-116