Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.092002
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Funding
- RHIC Operations Group and RCF at BNL
- NERSC Center at LBNL
- KISTI Center in Korea
- Open Science Grid consortium
- Offices of NP and HEP within the U.S. DOE Office of Science
- U.S. NSF
- CNRS/IN2P3
- FAPESP CNPq of Brazil
- Ministry of Education and Science of the Russian Federation
- NNSFC
- CAS
- MoST
- MoE of China
- Korean Research Foundation
- GA and MSMT of the Czech Republic
- FIAS of Germany
- DAE
- DST
- CSIR 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
- Direct For Mathematical & Physical Scien [1504099] Funding Source: National Science Foundation
- Division Of Physics [1504099] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205991, 1067907] Funding Source: National Science Foundation
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We report a new measurement of the midrapidity inclusive jet longitudinal double-spin asymmetry, A(LL), in polarized pp collisions at center-of-mass energy root s = 200 GeV. The STAR data place stringent constraints on polarized parton distribution functions extracted at next-to-leading order from global analyses of inclusive deep-inelastic scattering (DIS), semi-inclusive DIS, and RHIC pp data. The measured asymmetries provide evidence at the 3 sigma level for positive gluon polarization in the Bjorken-x region x > 0.05.
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