期刊
PHYSICAL REVIEW D
卷 103, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.103.L091103
关键词
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资金
- RCF at BNL
- NERSC Center at LBNL
- Open Science Grid consortium
- Office of Nuclear Physics within the U.S. DOE Office of Science
- U.S. National Science Foundation
- Ministry of Education and Science of the Russian Federation
- National Natural Science Foundation of China
- Chinese Academy of Science
- Ministry of Science and Technology of China
- Chinese Ministry of Education
- Higher Education Sprout Project by Ministry of Education at NCKU
- National Research Foundation of Korea
- Czech Science Foundation
- Ministry of Education, Youth and Sports of the Czech Republic
- Hungarian National Research, Development and Innovation Office, New National Excellency Programme of the Hungarian Ministry of Human Capacities
- Department of Atomic Energy and Department of Science and Technology of the Government of India
- National Science Centre of Poland
- Ministry of Science, Education and Sports of the Republic of Croatia
- German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie
- Helmholtz Association
- Ministry of Education, Culture, Sports, Science, and Technology
- Japan Society for the Promotion of Science
- RosAtom of Russia
- RHIC Operations Group
This study presents high-precision measurements of the longitudinal double-spin asymmetry, A(LL), for midrapidity inclusive jet and dijet production in polarized pp collisions at a center-of-mass energy of root s = 200 GeV. The new data provide insights into the gluon helicity distribution and suggest that Delta g(x, Q(2)) is positive for x > 0.05, strengthening previous findings and theoretical evaluations.
We report high-precision measurements of the longitudinal double-spin asymmetry, A(LL), for midrapidity inclusive jet and dijet production in polarized pp collisions at a center-of-mass energy of root s = 200 GeV. The new inclusive jet data are sensitive to the gluon helicity distribution, Delta g(x, Q(2)), for gluon momentum fractions in the range from x similar or equal to 0.05 to x similar or equal to 0.5, while the new dijet data provide further constraints on the x dependence of Delta g(x, Q(2)). The results are in good agreement with previous measurements at root s = 200 GeV and with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence that Delta g(x, Q(2)) is positive for x > 0.05.
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