Contribution of disconnected diagrams to the hyperfine splitting of charmonium
Contribution of disconnected diagrams to the hyperfine splitting of charmonium
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DOI：
10.1088/1126-6708/2004/08/004
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发表时间：
2004-04
影响因子：
5.4
通讯作者：
The QCD-TARO Collaboration Philippe de Forcrand;M. G. P'erez;H. Matsufuru;A. Nakamura;I. Pushkina;I. Stamatescu;T. Takaishi;T. Umeda
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文献类型：
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作者：
The QCD-TARO Collaboration Philippe de Forcrand;M. G. P'erez;H. Matsufuru;A. Nakamura;I. Pushkina;I. Stamatescu;T. Takaishi;T. Umeda
本文讨论了格点QCD中OZI压缩图对粲偶素超精细分裂的贡献。我们研究了从奇异夸克质量到粲夸克质量的价夸克质量区域。在矢量信道中没有看到不连通图的贡献.在赝标通道中，对于奇夸克周围的价夸克质量，不连续贡献导致介子质量的显著增加。这种贡献随着夸克质量的增加而迅速减少。对于粲偶素，虽然不能排除不连续贡献引起的赝标质量的减少，但影响很小。
We discuss the contribution of OZI-suppressed diagrams to the hyperflne split- ting of charmonium in lattice QCD. We study valence quark mass regions from strange to charm quark masses. No contribution of the disconnected diagram is seen in the vector me- son channel. In the pseudo-scalar channel and for valence quark masses around the strange quark, the disconnected contribution induces a considerable increase of the meson mass. This contribution quickly decreases as the quark mass increases. For charmonium the efiect is very small although a decrease of the pseudoscalar mass induced by the disconnected contribution cannot be ruled out.