期刊
PHYSICAL REVIEW D
卷 95, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.95.071103
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资金
- Office of Nuclear Physics within the U.S. DOE Office of Science
- U.S. NSF
- Ministry of Education and Science of the Russian Federation
- NSFC
- CAS
- MoST
- MoE of China
- National Research Foundation of Korea
- NCKU (Taiwan)
- GA and MSMT of the Czech Republic
- FIAS of Germany
- DAE
- DST
- UGC of India
- National Science Centre of Poland
- National Research Foundation
- Ministry of Science, Education and Sports of the Republic of Croatia
- RosAtom of Russia
- Direct For Mathematical & Physical Scien
- Division Of Physics [1613939] Funding Source: National Science Foundation
We report the first measurement of the longitudinal double-spin asymmetry A(LL) for midrapidity dijet production in polarized pp collisions at a center-of-mass energy of root s = 200 GeV. The dijet cross section was measured and is shown to be consistent with next-to-leading order (NLO) perturbative QCD predictions. A(LL) results are presented for two distinct topologies, defined by the jet pseudorapidities, and are compared to predictions from several recent NLO global analyses. The measured asymmetries, the first such correlation measurements, support those analyses that find positive gluon polarization at the level of roughly 0.2 over the region of Bjorken-x > 0.05.
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