4.7 Article

Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at √s=200 GeV

期刊

PHYSICAL REVIEW D
卷 103, 期 9, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.103.L091103

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资金

  1. RCF at BNL
  2. NERSC Center at LBNL
  3. Open Science Grid consortium
  4. Office of Nuclear Physics within the U.S. DOE Office of Science
  5. U.S. National Science Foundation
  6. Ministry of Education and Science of the Russian Federation
  7. National Natural Science Foundation of China
  8. Chinese Academy of Science
  9. Ministry of Science and Technology of China
  10. Chinese Ministry of Education
  11. Higher Education Sprout Project by Ministry of Education at NCKU
  12. National Research Foundation of Korea
  13. Czech Science Foundation
  14. Ministry of Education, Youth and Sports of the Czech Republic
  15. Hungarian National Research, Development and Innovation Office, New National Excellency Programme of the Hungarian Ministry of Human Capacities
  16. Department of Atomic Energy and Department of Science and Technology of the Government of India
  17. National Science Centre of Poland
  18. Ministry of Science, Education and Sports of the Republic of Croatia
  19. German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie
  20. Helmholtz Association
  21. Ministry of Education, Culture, Sports, Science, and Technology
  22. Japan Society for the Promotion of Science
  23. RosAtom of Russia
  24. RHIC Operations Group

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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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