Comprehensive calculations on the OZI-forbidden nonleptonic decays of orthoquarkonia J/ψ((sic)) → ππ, ρπ

被引:7
作者
Li, Tong [1 ,2 ]
Zhao, Shu-Min [2 ,3 ]
Li, Xue-Qian [2 ]
机构
[1] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
[2] Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China
[3] Hebei Univ, Dept Phys, Baoding 071002, Peoples R China
基金
中国国家自然科学基金;
关键词
Perturbative QCD; OZI-forbidden process; rho pi puzzle; E(+)E(-); J/PSI;
D O I
10.1016/j.nuclphysa.2009.06.021
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
In this work, we calculate the decay rates of the OZI-forbidden processes J/psi((sic)) -> pi pi, rho pi at the order of the leading-twist distribution amplitude. The process of J/psi((sic)) -> pi(+)pi(-) violates isospin conservation and the amplitude is explicitly proportional to the isospin violation factor m(u) - m(d), our numerical results on their decay rates are consistent with the data. The process J/psi((sic)) -> rho pi violates the hadronic helicity conservation and should be suppressed, as indicated in literature, its decay rate can only be proportional to m(q)(2) at the order of leading twist. Our theoretical evaluation confirms this statement that the theoretical evaluation on Gamma(J/psi((sic)) -> rho pi) is almost one order smaller than the data unless the model parameters take certain extreme values. It may imply that the sizable branching ratio of J/psi((sic)) -> rho pi should be explained by either higher twist contributions or other mechanisms. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:125 / 135
页数:11
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