Universality of 1/Q corrections revisited
Universality of 1/Q corrections revisited
复制标题
重新审视 1/Q 修正的普遍性
DOI：
--
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
G. Smye
中科院分区：
文献类型：
--
作者：
M. Dasgupta;L. Magnea;G. Smye
我们给出了e+e−湮灭中C参数超前功率修正的阿贝尔极限下双环水平的精确解析计算。我们将我们的结果与采用米兰因子的阿贝尔部分的软近似得到的数值进行比较。我们证明了在C参数的主要功率修正和软区域的纵向截面之间存在简单的比例性，并且我们验证了这种比例性适用于这里计算的完整双环阿贝尔贡献。我们评论了将这种技术扩展到其他事件形状变量和分布以及非阿贝尔贡献的可能性。
We provide an exact analytical calculation at the two-loop level in the abelian limit of the leading power correction for the C parameter in e+e− annihilation. We compare our results to the numerical value obtained employing the soft approximation, the abelian part of the Milan factor. We demonstrate that a simple proportionality holds between the leading power corrections to the C parameter and to the longitudinal cross section in the soft region, and we verify that this proportionality holds for the full two-loop abelian contribution computed here. We comment on the possibility of extending this technique to other event shape variables and distributions, as well as to the non-abelian contributions.