arXiv 1104.28642011-04-14hep-phhep-ex

QCD求和规则中的魅力耦合和形状因子

Charm couplings and form factors in QCD sum rules

M. E. Bracco, M. Chiapparini, F. S. Navarra, M. Nielsen

备注：: 43 pages, 26 figures, 10 tables
DOI：: 10.1016/j.ppnp.2012.03.002

摘要：

在QCD求和规则的框架下，我们回顾了粲介子顶点的形状因子和耦合常数的计算。我们首先讨论这项工作的动机，描述这些形状因子的重离子碰撞和B衰变的可能应用。然后，我们介绍了QCD求和规则的方法，并描述了如何使用三点函数。我们特别注意的程序外推得到的结果在深欧几里德区域的粒子的极点，位于类时区域。我们提供了一个所有形状因子的即用型参数化表，这些参数与引言中提到的工艺相关。我们讨论了结果中的不确定性。我们也给出了耦合常数，并与其他方法得到的估计值进行了比较。最后，我们将所得结果应用于反应$J/ψ+ π\rightarrow D + \bar{D^*}$的截面计算。

英文摘要：

We review the calculations of form factors and coupling constants in vertices with charm mesons in the framework of QCD sum rules. We first discuss the motivation for this work, describing possible applications of these form factors to heavy ion collisions and to B decays. We then present an introduction to the method of QCD sum rules and describe how to work with the three-point function. We give special attention to the procedure employed to extrapolate results obtained in the deep euclidean region to the poles of the particles, located in the time-like region. We present a table of ready-to-use parametrizations of all the form factors, which are relevant for the processes mentioned in the introduction. We discuss the uncertainties in our results. We also give the coupling constants and compare them with estimates obtained with other methods. Finally we apply our results to the calculation of the cross section of the reaction $J/ψ+ π\rightarrow D + \bar{D^*}$.

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英文摘要：

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