Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-04-02
Phys.Lett. B382 (1996) 165-172
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 5 postscript figures, LaTex, tarred with epsf and additional style file
Scientific paper
10.1016/0370-2693(96)00560-6
Plans are underway to measure spin asymmetries at large momentum transfer in hadron hadron collisions at RHIC and elsewhere. Proposals have focused on measuring quark transversity and quark and gluon helicity distributions in the nucleon. These experiments will also provide a strong and simple test of perturbative QCD, namely that ${\cal A}_{TT}/{\cal A}_{LL}\ll 1$ in $pp\rightarrow 2\, {\rm jets} +X$ and several related processes, whereas ${\cal A}_{TT}/{\cal A}_{LL}\sim 1$ in Drell-Yan production of muon pairs. The prediction tests the helicity, twist and chirality selection rules of perturbative QCD that form the foundation for the analysis of spin dependent hard processes. We estimate the ratio ${\cal A}_{TT}/{\cal A}_{LL}$ numerically for polarized protons at RHIC.
Jaffe Richard L.
Saito Naohito
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