Spin-flip interactions and the puzzle of psi
文献类型：期刊论文
| 作者 | Liu, Kui-Yong; Ma, Han-Ping; Wu, Xing-Gang; Wu, XG , Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China |
| 刊名 | PHYSICS LETTERS B
 |
| 出版日期 | 2007 |
| 卷号 | 645期号:40942页码:180-184 |
| 关键词 | Nrqcd Matrix-elements Root S=1.8 Tev Heavy Quarkonium p(p)Over-bar Collisions Gluon Fragmentation Fermilab-tevatron Qcd Analysis J/psi Factorization Annihilation |
| ISSN号 | 0370-2693 |
| 英文摘要 | Non-relativistic QCD provides a systematic approach for inclusive decays and productions of a quarkonium. By taking the color-octet components into account, the approach can explain the psi'-anornaly at Tevatron, where the measured production rate at large transverse momentum p perpendicular to is in order of magnitude larger than the predicted with color-singlet components only. With the approach one can predict that the produced J/psi and psi' at large p perpendicular to will be transversely polarized. But such prediction fails in confronting with experimental measurements and this generates a puzzle. We examine the role of spin-flip interactions in the spin density matrix of the transition of a color-octet charm quark pair into J/psi and psi'. These interactions will introduce new non-perturbative parameters in the spin density matrix. Our result shows that the impact of the interactions is always to dilute the polarization and can be very significant. Taking the impact into account, predictions for the polarization are more close to the measured than the previous predicted. The same can also be expected for the polarization of J/psi. (c) 2007 Elsevier B.V. All rights reserved. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| 公开日期 | 2012-08-02 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/5792]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 通讯作者 | Wu, XG , Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Kui-Yong,Ma, Han-Ping,Wu, Xing-Gang,et al. Spin-flip interactions and the puzzle of psi[J]. PHYSICS LETTERS B,2007,645(40942):180-184. |
| APA | Liu, Kui-Yong,Ma, Han-Ping,Wu, Xing-Gang,&Wu, XG , Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China.(2007).Spin-flip interactions and the puzzle of psi.PHYSICS LETTERS B,645(40942),180-184. |
| MLA | Liu, Kui-Yong,et al."Spin-flip interactions and the puzzle of psi".PHYSICS LETTERS B 645.40942(2007):180-184. |
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来源：理论物理研究所
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