粲偶素超精细分裂的粲湮灭效应
Charm annihilation effects on the hyperfine splitting in charmonium
摘要：
在粲偶素超精细分裂的计算中，不连通图的贡献被认为是很小的，通常被忽略。我们的目标是估计非微扰的大小所产生的校正，这可能最终需要在高精度计算的粲谱。我们在猝灭和非猝灭QCD情形下研究了这个问题。在动力学系综上，断开的粲偶素传播子包含使在大距离处提取信号复杂化的光模式。在完全猝灭的情况下，其中没有这样的光模式，信号的解释被简化。我们目前的结果与$a\approx 0.09$ fm和$a\approx 0.06$ fm格。
英文摘要：
In calculations of the hyperfine splitting in charmonium, the contributions of the disconnected diagrams are considered small and are typically ignored. We aim to estimate nonperturbatively the size of the resulting correction, which may eventually be needed in high precision calculations of the charmonium spectrum. We study this problem in the quenched and unquenched QCD cases. On dynamical ensembles the disconnected charmonium propagators contain light modes which complicate the extraction of the signal at large distances. In the fully quenched case, where there are no such light modes, the interpretation of the signal is simplified. We present results from lattices with $a\approx 0.09$ fm and $a\approx 0.06$ fm.
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