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题名: Exclusive decay of 1(--) quarkonia and B-c meson into a lepton pair combined with two pions
作者: Ma, JP ;  Xu, JS
刊名: EUROPEAN PHYSICAL JOURNAL C
出版日期: 2002
卷号: 24, 期号:2, 页码:261-270
关键词: P(P)OVER-BAR COLLISIONS ;  HADRONIC TRANSITIONS ;  HEAVY QUARKONIUM ;  ROOT-S=1.8 TEV ;  QCD-ANALYSIS ;  2 PIONS ;  STATES
学科分类: Physics
通讯作者: Ma, JP , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
部门归属: Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; China Ctr Adv Sci & Technol, World Lab, Beijing 100080, Peoples R China
英文摘要: We study the exclusive decay of J/psi, Y and B-c into a lepton pair combined with two pions in two kinematic regions. One is specified by the two pions having large momenta, but a small invariant mass. The other is specified by the two pions having small momenta. In both cases we find that in the heavy quark limit the decay amplitude takes a factorized form, in which the non-perturbative effect related to the heavy meson is represented by a NRQCD matrix element. The non-perturbative effects related to the two pions are represented by some universal functions characterizing the conversion of gluons into pions. Using models for these universal functions and chiral perturbative theory we are able to obtain numerical predictions for the decay widths. Our numerical results show that the decay of J/psi is of the order of 10(-5) with reasonable cuts and can be observed at BES II and the proposed BES III and CLEO-C. For other decays the branching ratio may be too small to be measured.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000176937900007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13507
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:
Ma, JP,Xu, JS. Exclusive decay of 1(--) quarkonia and B-c meson into a lepton pair combined with two pions[J]. EUROPEAN PHYSICAL JOURNAL C,2002,24(2):261-270.
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