Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at root s=200 GeV
文献类型：期刊论文
| 作者 | Adamczyk, L.1; Adkins, J. K.23; Agakishiev, G.21; Aggarwal, M. M.35; Ahammed, Z.54; Alekseev, I.19; Alford, J.22; Anson, C. D.32; Aparin, A.21; Arkhipkin, D.4 |
| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2014-01-15 |
| 卷号 | 89 |
| ISSN号 | 1550-7998 |
| DOI | 10.1103/PhysRevD.89.012001 |
| 文献子类 | Article |
| 英文摘要 | The differential cross section and spin asymmetries for neutral pions produced within the intermediate pseudorapidity range 0.8 < eta < 2.0 in polarized proton-proton collisions at root s = 200 GeV are presented. Neutral pions were detected using the end cap electromagnetic calorimeter in the STAR detector at RHIC. The cross section was measured over a transverse momentum range of 5 < p(T) < 16 GeV/c and is found to agree with a next-to-leading order perturbative QCD calculation. The longitudinal double-spin asymmetry A(LL) is measured in the same pseudorapidity range and spans a range of Bjorken-x down to x approximate to 0.01. The measured A(LL) is consistent with model predictions for varying degrees of gluon polarization. The parity-violating asymmetry A(L) is also measured and found to be consistent with zero. The transverse single-spin asymmetry A(N) is measured over a previously unexplored kinematic range in Feynman-x and p(T). Such measurements may aid our understanding of the onset and kinematic dependence of the large asymmetries observed at more forward pseudorapidity (eta approximate to 3) and their underlying mechanisms. The A(N) results presented are consistent with a twist-3 model prediction of a small asymmetry over the present kinematic range. |
| WOS关键词 | PLUS P COLLISIONS ; PI-0 PRODUCTION ; PARTON DISTRIBUTIONS ; TRANSVERSE-MOMENTUM ; STAR ; FRAGMENTATION ; ANTIPROTONS ; QCD |
| 资助项目 | National Research Foundation[NRF-2012004024] |
| WOS研究方向 | Astronomy & Astrophysics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000331864800001 |
| 出版者 | AMER PHYSICAL SOC |
| 源URL | [http://119.78.100.186/handle/113462/49805]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Adamczyk, L. |
| 作者单位 | 1.AGH Univ Sci & Technol, Krakow, Poland 2.Argonne Natl Lab, Argonne, IL 60439 USA 3.Univ Birmingham, Birmingham, W Midlands, England 4.Brookhaven Natl Lab, Upton, NY 11973 USA 5.Univ Calif Berkeley, Berkeley, CA 94720 USA 6.Univ Calif Davis, Davis, CA 95616 USA 7.Univ Calif Los Angeles, Los Angeles, CA 90095 USA 8.Univ Estadual Campinas, Sao Paulo, Brazil 9.Cent China Normal Univ HZNU, Wuhan 430079, Peoples R China 10.Univ Illinois, Chicago, IL 60607 USA |
| 推荐引用方式 GB/T 7714 | Adamczyk, L.,Adkins, J. K.,Agakishiev, G.,et al. Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at root s=200 GeV[J]. PHYSICAL REVIEW D,2014,89. |
| APA | Adamczyk, L..,Adkins, J. K..,Agakishiev, G..,Aggarwal, M. M..,Ahammed, Z..,...&STAR Collaboration.(2014).Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at root s=200 GeV.PHYSICAL REVIEW D,89. |
| MLA | Adamczyk, L.,et al."Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at root s=200 GeV".PHYSICAL REVIEW D 89(2014). |
入库方式： OAI收割
来源：近代物理研究所
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