Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.222001
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Funding
- U. S. DOE Office of Science
- U. S. NSF
- Renaissance Technologies Corporation
- BMBF of Germany
- CNRS/IN2P3
- EMN of France
- EPSRC of the United Kingdom
- FAPESP of Brazil
- Russian Ministry of Science and Technology
- Ministry of Education and the NNSFC of China
- Polish State Committee for Scientific Research
- Slovak Research and Development Agency
- Korea Science and Engineering Foundation
- STFC [PP/F001061/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/F001061/1] Funding Source: researchfish
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We report precision measurements of the Feynman x (x(F)) dependence, and first measurements of the transverse momentum (p(T)) dependence, of transverse single-spin asymmetries for the production of pi(0) mesons from polarized proton collisions at s=200 GeV. The x(F) dependence of the results is in fair agreement with perturbative QCD model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the p(T) dependence at fixed x(F) are not consistent with these same perturbative QCD-based calculations.
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