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题名: Spin-flip interactions and the puzzle of psi
作者: Liu, Kui-Yong ;  Ma, Han-Ping ;  Wu, Xing-Gang
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
学科分类: Physics
通讯作者: Wu, XG , Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China
部门归属: Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China
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.
收录类别: SCI
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5792
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Liu, Kui-Yong,Ma, Han-Ping,Wu, Xing-Gang. Spin-flip interactions and the puzzle of psi[J]. PHYSICS LETTERS B,2007,645(40942):180-184.
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