Angular distributions of leptons from J/psi's produced in 920 GeV fixed-target proton-nucleus collisions
文献类型：期刊论文
| 作者 | HERA-B Collaboration |
| 刊名 | EUROPEAN PHYSICAL JOURNAL C
 |
| 出版日期 | 2009 |
| 卷号 | 60期号:4页码:#REF! |
| 通讯作者 | Abt, I (reprint author), NIKHEF, NL-1009 DB Amsterdam, Netherlands. |
| 英文摘要 | A study of the angular distributions of leptons from decays of J/psi's produced in p-C and p-W collisions at root s = 41.6 GeV has been performed in the J/psi Feynman-x region -0.34 < x(F) < 0.14 and for J/psi transverse momenta up to 5.4 GeV/c. The data were collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The results, based on a clean selection of 2.3 x 10(5) J/psi's reconstructed in both the e(+)e(-) and mu(+)mu(-) decay channels, indicate that J/psi's are produced polarized. The magnitude of the effect is maximal at low p(T). For p(T) > 1 GeV/c a significant dependence on the reference frame is found: the polar anisotropy is more pronounced in the Collins-Soper frame and almost vanishes in the helicity frame, where, instead, a significant azimuthal anisotropy arises. |
| 学科主题 | Physics |
| 类目[WOS] | Physics, Particles & Fields |
| 收录类别 | SCI |
| WOS记录号 | WOS:000265215100001 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/227708]  |
| 专题 | 高能物理研究所_实验物理中心 |
| 推荐引用方式 GB/T 7714 | HERA-B Collaboration. Angular distributions of leptons from J/psi's produced in 920 GeV fixed-target proton-nucleus collisions[J]. EUROPEAN PHYSICAL JOURNAL C,2009,60(4):#REF!. |
| APA | HERA-B Collaboration.(2009).Angular distributions of leptons from J/psi's produced in 920 GeV fixed-target proton-nucleus collisions.EUROPEAN PHYSICAL JOURNAL C,60(4),#REF!. |
| MLA | HERA-B Collaboration."Angular distributions of leptons from J/psi's produced in 920 GeV fixed-target proton-nucleus collisions".EUROPEAN PHYSICAL JOURNAL C 60.4(2009):#REF!. |
入库方式： OAI收割
来源：高能物理研究所
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