Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, Bonn, Germany.
Phys Rev Lett. 2012 Mar 16;108(11):112002. doi: 10.1103/PhysRevLett.108.112002. Epub 2012 Mar 13.
Coupled-channel effects due to coupling of charmonia to the charmed and anticharmed mesons are of current interest in heavy quarkonium physics. However, the effects have not been unambiguously established. In this Letter, a clean method is proposed in order to examine the coupled-channel effects in charmonium transitions. We show that the hindered M1 radiative transitions from the 2P to 1P charmonia are suitable for this purpose. We suggest to measure one or more of the ratios Γ(h(c)'→χ(cJ)γ)/Γ(χ(cJ)'→χ(cJ)π(0)) and Γ(χ(cJ)'→h(c)γ)/Γ(χ(cJ)'→χ(cJ)π(0)), for which highly nontrivial and parameter-free predictions are given. The picture can also be tested using both unquenched and quenched lattice calculations.
由于粲介子与粲和反粲介子的耦合，耦合通道效应对重夸克偶素物理具有当前的研究兴趣。然而，这些效应尚未得到明确的证实。在这封信中，提出了一种干净的方法来检验重夸克偶素跃迁中的耦合通道效应。我们表明，从 2P 到 1P 粲介子的受阻 M1 辐射跃迁适用于此目的。我们建议测量一个或多个比值 Γ(h(c)'→χ(cJ)γ)/Γ(χ(cJ)'→χ(cJ)π(0)) 和 Γ(χ(cJ)'→h(c)γ)/Γ(χ(cJ)'→χ(cJ)π(0))，对于这些比值，我们给出了非常重要且无参数的预测。这个图像也可以使用非淬火和淬火晶格计算来进行测试。
