Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-21
Chin.Phys.C35:419, 2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
Scientific paper
10.1088/1674-1137/35/5/002
We indicated in our previous work that for QED the contributions of the scalar potential which appears at the loop level is much smaller than that of the vector potential and in fact negligible. But the situation may be different for QCD, one reason is that the loop effects are more significant because $\alpha_s$ is much larger than $\alpha$, and secondly the non-perturbative QCD effects may induce the scalar potential. In this work, we phenomenologically study the contribution of the scalar potential to the spectra of charmonia. Taking into account both vector and scalar potentials, by fitting the well measured charmonia spectra, we re-fix the relevant parameters and test them by calculating other states of the charmonia family. We also consider the role of the Lamb shift and present the numerical results with and without involving the Lamb shift.
Ke Hong-Wei
Li Xue-Qian
Yuan Xu-Hao
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