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题名: On two-body decays of a scalar glueball
作者: Chao, K. T. ;  He, Xiao-Gang ;  Ma, J. P.
刊名: EUROPEAN PHYSICAL JOURNAL C
出版日期: 2008
卷号: 55, 期号:3, 页码:417-421
关键词: QCD FACTORIZATION ;  PARTICLE PHYSICS ;  SPECTRUM ;  LATTICE
学科分类: Physics
通讯作者: Chao, KT , Peking Univ, Dept Phys, Beijing 100871, Peoples R China
部门归属: [Chao, KT; He, XG; Ma, JP] Peking Univ, Dept Phys, Beijing 100871, Peoples R China; [He, XG] Natl Taiwan Univ, Dept Phys, Taipei, Taiwan; [He, XG] Natl Taiwan Univ, Ctr Theoret Sci, Taipei, Taiwan; [Ma, JP] Acad Sinica, Inst Theoret Phys, Beijing, Peoples R China
英文摘要: We study two-body decays of a scalar glueball. We show that in QCD a spin-0 pure glueball (a state with only gluons) cannot decay into a pair of light quarks if chiral symmetry holds exactly, i.e., the decay amplitude is chirally suppressed. However, this chiral suppression does not materialize itself at the hadron level such as in decays into pi(+)pi(-) and K+K-. We show this explicitly in the two cases with the glueball much lighter and much heavier than the QCD scale using low-energy theorems and perturbative QCD. For a heavy glueball, using QCD factorization based on an effective Lagrangian, we find that the hadronization into pi pi and KK leads to a large difference between Br(pi(+)pi(-)) and Br(K+K-); even the decay amplitude is not chirally suppressed. Our results can provide some understanding of the partonic contents if Br(pi pi) or Br(K (K) over bar) is measured reliably.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000256325100007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5525
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:
Chao, K. T.,He, Xiao-Gang,Ma, J. P.. On two-body decays of a scalar glueball[J]. EUROPEAN PHYSICAL JOURNAL C,2008,55(3):417-421.
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