Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-05-31
Phys.Rev.Lett.99:142003,2007
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages total, 1 Latex file, 3 PS files with figures
Scientific paper
10.1103/PhysRevLett.99.142003
We report the first measurement of the opening angle distribution between pairs of jets produced in high-energy collisions of transversely polarized protons. The measurement probes (Sivers) correlations between the transverse spin orientation of a proton and the transverse momentum directions of its partons. With both beams polarized, the wide pseudorapidity ($-1 \leq \eta \leq +2$) coverage for jets permits separation of Sivers functions for the valence and sea regions. The resulting asymmetries are all consistent with zero and considerably smaller than Sivers effects observed in semi-inclusive deep inelastic scattering (SIDIS). We discuss theoretical attempts to reconcile the new results with the sizable transverse spin effects seen in SIDIS and forward hadron production in pp collisions.
Abelev Betty I.
STAR Collaboration
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