Hadronic loop contributions to J/psi and psi radiative decays into gammaeta or gammaetac'
Hadronic loop contributions to J/psi and psi radiative decays into gammaeta or gammaetac'
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DOI：
10.1016/j.physletb.2008.10.033
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发表时间：
2007-09
影响因子：
4.4
通讯作者：
Gang Li;Qiang Zhao
中科院分区：
文献类型：
--
作者：
Gang Li;Qiang Zhao
除了有效拉格朗日方法中的主要 M1 跃迁之外，还研究了中间强子介子环对 J/ψ、ψ'→ γηc (γηc') 的贡献。由于 V → VP 中独特的反对称张量耦合的特性，强子环跃迁通过耦合形状因子对源自朴素“淬火”cc-bar 跃迁的 M1 跃迁幅度提供了明确的校正。这种干扰 M1 跃迁振幅的机制自然地解释了 J/ψ 和 ψ'→ γηc 中与 Godfrey-Isgur 模型预测的偏差。它还预测 ψ'→ γηc' 的小分支比，这可以通过 BES 和 CLEO-c 的实验测量来检查
Intermediate hadronic meson loop contributions to J/ψ, ψ'→ γηc (γηc') are studied apart from the dominant M1 transitions in an effective Lagrangian approach. Due to the property of the unique antisymmetric tensor coupling in V→ VP, the hadronic loop transitions provide explicit corrections to the M1 transition amplitudes derived from the naive'quenched'cc-bar transitions via the coupling form factors. This mechanism interfering with the M1 transition amplitudes naturally accounts for the deviations from the Godfrey-Isgur model predictions in J/ψ and ψ'→ γηc. It also predicts a small branching ratio of ψ'→ γηc', which can be examined by experimental measurements at BES and CLEO-c