期刊
PHYSICAL REVIEW D
卷 86, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.86.051101
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资金
- RHIC Operations Group and RCF at BNL
- NERSC Center at LBNL
- Open Science Grid consortium
- Offices of NP and HEP within the U.S. DOE Office of Science
- U.S. NSF
- Sloan Foundation
- Renaissance Technologies Corporation
- DFG cluster of excellence Origin and Structure of the Universe'' of Germany
- FAPESP CNPq of Brazil
- Ministry of Education and Science of the Russian Federation
- NNSFC
- CAS
- MoST
- MoE of China
- GA and MSMT of the Czech Republic
- FOM and NWO 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
- RosAtom of Russia
- CNRS/IN2P3
Measurements of the differential cross section and the transverse single-spin asymmetry, A(N), vs x(F) for pi(0) and eta mesons are reported for 0.4 < x(F) < 0.75 at an average pseudorapidity of 3.68. A data sample of approximately 6.3 pb(-1) was analyzed, which was recorded during p(up arrow) + p collisions at root s = 200 GeV by the STAR experiment at RHIC. The average transverse beam polarization was 56%. The cross section for pi(0), including the previously unmeasured region of x(F) > 0.55, is consistent with a perturbative QCD prediction, and the eta/pi(0) cross-section ratio agrees with existing midrapidity measurements. For 0.55 < x(F) < 0.75, the average A(N) for eta is 0.210 +/- 0.056, and that for pi(0) is 0.081 +/- 0.016. The probability that these two asymmetries are equal is similar to 3%.
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