A Measurement of the psi ' to J/psi production ratio in 920 GeV proton-nucleus interactions
文献类型：期刊论文
| 作者 | HERA-B Collaboration |
| 刊名 | EUROPEAN PHYSICAL JOURNAL C
 |
| 出版日期 | 2007 |
| 卷号 | 49期号:2页码:#REF! |
| 通讯作者 | Abt, I (reprint author), Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany. |
| 英文摘要 | Ratios of the psi' over the J/psi production cross sections in the dilepton channel for C, Ti and W targets have been measured in 920 GeV proton-nucleus interactions with the HERA-B detector at the HERA storage ring. The psi' and J/psi states were reconstructed in both the mu(+) mu(-) and the e(+) e(-) decay modes. The measurements covered the kinematic range -0.35 <= x(F)<= 0.1 with transverse momentum >= 4.5 GeV/c. The angular dependence of the ratio has been used to measure the difference of the psi' and J/psi polarization. All results for the muon and electron decay channels are in good agreement: their ratio, averaged over all events, is R-psi'(mu)/R-psi'(e)=1.00 +/- 0.08 +/- 0.04. This result constitutes a new, direct experimental constraint on the double ratio of branching fractions, (B' (mu)B(e))/(B(mu)B'(e)), of psi' and J/psi in the two channels. The psi' to J/psi production ratio is almost constant in the covered x(F) range and shows a slow increase with p(T). |
| 学科主题 | Physics |
| 类目[WOS] | Physics, Particles & Fields |
| 收录类别 | SCI |
| WOS记录号 | WOS:000243973100010 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/227718]  |
| 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. A Measurement of the psi ' to J/psi production ratio in 920 GeV proton-nucleus interactions[J]. EUROPEAN PHYSICAL JOURNAL C,2007,49(2):#REF!. |
| APA | HERA-B Collaboration.(2007).A Measurement of the psi ' to J/psi production ratio in 920 GeV proton-nucleus interactions.EUROPEAN PHYSICAL JOURNAL C,49(2),#REF!. |
| MLA | HERA-B Collaboration."A Measurement of the psi ' to J/psi production ratio in 920 GeV proton-nucleus interactions".EUROPEAN PHYSICAL JOURNAL C 49.2(2007):#REF!. |
入库方式： OAI收割
来源：高能物理研究所
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