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On two-body decays of a scalar glueball
Chao, K. T.; He, Xiao-Gang; Ma, J. P.; Chao, KT , Peking Univ, Dept Phys, Beijing 100871, Peoples R China
2008
发表期刊EUROPEAN PHYSICAL JOURNAL C
ISSN1434-6044
卷号55期号:3页码:417-421
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.
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
关键词Qcd Factorization Particle Physics Spectrum Lattice
学科领域Physics
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收录类别SCI
WOS记录号WOS:000256325100007
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5525
专题理论物理所1978-2010年知识产出
通讯作者Chao, KT , Peking Univ, Dept Phys, Beijing 100871, Peoples R China
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Chao, K. T.,He, Xiao-Gang,Ma, J. P.,et al. On two-body decays of a scalar glueball[J]. EUROPEAN PHYSICAL JOURNAL C,2008,55(3):417-421.
APA Chao, K. T.,He, Xiao-Gang,Ma, J. P.,&Chao, KT , Peking Univ, Dept Phys, Beijing 100871, Peoples R China.(2008).On two-body decays of a scalar glueball.EUROPEAN PHYSICAL JOURNAL C,55(3),417-421.
MLA Chao, K. T.,et al."On two-body decays of a scalar glueball".EUROPEAN PHYSICAL JOURNAL C 55.3(2008):417-421.
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