Production of the charmonium states chi(c1) and chi(c2) in proton nucleus interactions at root s=41.6 GeV
文献类型：期刊论文
| 作者 | HERA-B Collaboration |
| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2009 |
| 卷号 | 79期号:1页码:12001 |
| 通讯作者 | Abt, I (reprint author), Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany. |
| 英文摘要 | A measurement of the ratio R-chi c = (chi(c) --> J/psi + gamma)/J/psi in pC, pTi, and pW interactions at 920 GeV/c (root s = 41.6 GeV) in the Feynman-x range -0.35 < x(F)(J/psi) < 0.15 is presented. Both mu(+)mu(-) and e(+)e(-) J/psi decay channels are observed with an overall statistics of about 15 000 chi(c) events, which is by far the largest available sample in pA collisions. The result is R chi(c) = 0.188 +/- 0.013(st-0.022sys)(+0.024) averaged ratio R-12 = R-chi c1/R-chi c2 is measured to be 1.02 +/- 0.40, leading to a cross section ratio sigma(chi(c1))/sigma(chi(c2)) = 0.57 +/- 0.23. The dependence of R-chi c on the Feynman-x of the J/psi, x(F)(J/psi), and its transverse momentum, p(T)(J/psi), is studied, as well as its dependence on the atomic number, A, of the target. For the first time, an extensive study of possible biases on R-chi c and R-12 due to the dependence of acceptance on the polarization states of J/psi and chi(c) is performed. By varying the polarization parameter, lambda(obs), of all produced J/psi's by two sigma around the value measured by HERA-B, and considering the maximum variation due to the possible chi(c1) and chi(c2) polarizations, it is shown that R-chi c could change by a factor between 1.02 and 1.21 and R-12 by a factor between 0.89 and 1.16. |
| 学科主题 | Astronomy & Astrophysics; Physics |
| 类目[WOS] | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 收录类别 | SCI |
| WOS记录号 | WOS:000262979700008 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/227878]  |
| 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. Production of the charmonium states chi(c1) and chi(c2) in proton nucleus interactions at root s=41.6 GeV[J]. PHYSICAL REVIEW D,2009,79(1):12001. |
| APA | HERA-B Collaboration.(2009).Production of the charmonium states chi(c1) and chi(c2) in proton nucleus interactions at root s=41.6 GeV.PHYSICAL REVIEW D,79(1),12001. |
| MLA | HERA-B Collaboration."Production of the charmonium states chi(c1) and chi(c2) in proton nucleus interactions at root s=41.6 GeV".PHYSICAL REVIEW D 79.1(2009):12001. |
入库方式： OAI收割
来源：高能物理研究所
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