Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.132301
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Funding
- Office of Nuclear Physics within the U.S. DOE Office of Science
- U.S. NSF
- Ministry of Education
- NNSFC
- CAS
- MoST
- MoE of China
- National Research Foundation of Korea
- GA and MSMT of the Czech Republic
- FIAS of Germany
- DAE
- DST
- UGC of India
- National Science Centre of Poland
- National Research Foundation [NRF-2012004024]
- Ministry of Science, Education and Sports of the Republic of Croatia
- RosAtom of Russia
- Science of the Russian Federation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1206009, 1352081] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1505716] Funding Source: National Science Foundation
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We present the measurement of the transverse single-spin asymmetry of weak boson production in transversely polarized proton-proton collisions at root s = 500 GeV by the STAR experiment at RHIC. The measured observable is sensitive to the Sivers function, one of the transverse-momentum-dependent parton distribution functions, which is predicted to have the opposite sign in proton-proton collisions from that observed in deep inelastic lepton-proton scattering. These data provide the first experimental investigation of the nonuniversality of the Sivers function, fundamental to our understanding of QCD.
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