Effect of charmed meson loops on charmonium transitions

被引：116
作者：
Guo, Feng-Kun [1 ,2 ,3 ]
Hanhart, C. [2 ,3 ,4 ]
Li, Gang [5 ,6 ]
Meissner, Ulf-G. [1 ,2 ,3 ,4 ,7 ]
Zhao, Qiang [5 ,8 ]
机构：
[1] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany
[2] Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany
[3] Forschungszentrum Julich, Julich Ctr Hadron Phys, D-52425 Julich, Germany
[4] Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany
[5] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
[6] Qufu Normal Univ, Dept Phys, Qufu 273165, Peoples R China
[7] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany
[8] Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China
来源：
PHYSICAL REVIEW D | 2011年 / 83卷 / 03期
基金：
中国国家自然科学基金;
关键词：
CHIRAL PERTURBATION-THEORY; HADRONIC TRANSITIONS; DECAYS; QUARKONIA; SYMMETRY; QCD; BREAKING; MASSES; RATIOS; J/PSI;
D O I：
10.1103/PhysRevD.83.034013
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The effects of intermediate charmed mesons on charmonium transitions with the emission of one pion or eta are studied systematically. Based on a nonrelativistic effective field theory we show that charmed meson loops are enhanced compared to the corresponding tree-level contributions for transitions between two S-wave charmonia as well as for transitions between two P-wave charmonia. On the contrary, for the transitions between one S-wave and one P-wave charmonium state, the loops need to be analyzed case by case and often appear to be suppressed. The relation to and possible implications for an effective Lagrangian approach are also discussed. This study at the same time provides a cross-check for the numerical evaluations.
引用
收藏
页数：29
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