Measurement of Transverse Single-Spin Asymmetries for Di-JetProduction in Proton-Proton Collisions at sqrt s = 200 GeV
We report the first measurement of the opening angledistribution between pairs of jets produced in high-energy collisions oftransversely polarized protons. The measurement probes (Sivers)correlations between the transverse spin orientation of a proton and thetransverse momentum directions of its partons. With both beams polarized,the wide pseudorapidity (-1 leq eta leq +2) coverage for jets permitsseparation of Sivers functions for the valence and sea regions. Theresulting asymmetries are all consistent with zero and considerablysmaller than Sivers effects observed in semi-inclusive deep inelasticscattering (SIDIS). We discuss theoretical attempts to reconcile the newresults with the sizable transverse spin effects seen in SIDIS andforward hadron production in pp collisions.
- Research Organization:
- COLLABORATION - Brookhaven NationalLaboratory
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 932584
- Report Number(s):
- LBNL-63651; PRLTAO; R&D Project: NRNC; TRN: US0803569
- Journal Information:
- Physical Review Letters, Vol. 99; Related Information: Journal Publication Date: 10/02/2007; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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