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Spin-flip interactions and the puzzle of psi
Liu, Kui-Yong; Ma, Han-Ping; Wu, Xing-Gang; Wu, XG , Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China
2007
发表期刊PHYSICS LETTERS B
ISSN0370-2693
卷号645期号:40942页码:180-184
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.
部门归属Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China
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
学科领域Physics
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收录类别SCI
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5792
专题理论物理所SCI论文
通讯作者Wu, XG , Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China
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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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