期刊
PHYSICAL REVIEW C
卷 80, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.80.041902
关键词
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资金
- Offices of NP
- HEP within the US DOE Office of Science
- US NSF
- Sloan Foundation
- DFG
- CNRS/IN2P3
- STFC
- EPSRC of the United Kingdom
- FAPESP
- CNPq of Brazil
- Ministry of Education and Science of the Russian Federation
- NNSFC
- CAS
- MoST
- MoE of China
- GA
- MSMT of the Czech Republic
- FOM
- NOW of the Netherlands
- DAE
- DST
- CSIR of India
- Polish Ministry of Science and Higher Education
- Korea Research Foundation
- Ministry of Science, Education and Sports of the Republic of Croatia
- Russian Ministry of Science and Technology
- Rosatom of Russia
- STFC [PP/F001061/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/F001061/1] Funding Source: researchfish
The STAR Collaboration at the Relativistic Heavy Ion Collider presents measurements of J/psi e(+) e(-) at midrapidity and high transverse momentum (pT > 5 GeV/c) in p + p and central Cu + Cu collisions at root s(NN) = 200 GeV. The inclusive J/psi production cross section for Cu + Cu collisions is found to be consistent at high p(T) with the binary collision-scaled cross section for p + p collisions. At a confidence level of 97%, this is in contrast to a suppression of J/psi production observed at lower p(T). Azimuthal correlations of J/psi with charged hadrons in p + p collisions provide an estimate of the contribution of B-hadron decays to J/psi production of 13% +/- 5%.
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