...
首页> 外文期刊>Computer physics communications >QCD evolution equations: numerical algorithms from the Laguerre expansion
【24h】

QCD evolution equations: numerical algorithms from the Laguerre expansion

机译:QCD演化方程式:来自Laguerre展开的数值算法

获取原文
获取原文并翻译 | 示例
           

摘要

A complete numerical implementation, in both singlet and nonsinglet sectors, of a very elegant method to solve the QCD Evolution equations, due to Furmanski and Petronzio, is presented. The algorithm is directly implemented in x-space by a Laguerre expansion of the parton distributions. All the leading-twist distributions are evolved: longitudinally polarized, transversely polarized and unpolarized, to NLO accuracy. The expansion is optimal at finite x, up to reasonably small x-values (x approximately 10 super(-3)), below which the convergence of the expansion slows down. The polarized evolution is smoother, due to the less singular structure of the polarized DGLAP kernels at small-x. In the region of fast convergence, which covers most of the usual perturbative applications, high numerical accuracy is achieved by expanding over a set of approximately 30 polynomials, with a very modest running time.
机译:由于Furmanski和Petronzio,提出了在单线态和非单线态的完整数值实现,一种非常优雅的方法来求解QCD演化方程。该算法通过parton分布的Laguerre展开直接在x空间中实现。所有的前扭曲分布都得到了发展:纵向极化,横向极化和非极化,达到NLO精度。扩展在有限的x处是最佳的,最大x值较小(x约为10 super(-3)),在此以下,扩展的收敛速度变慢。由于在小x处极化DGLAP内核的奇异结构较少,因此极化演化更为平滑。在涵盖大多数常用扰动应用的快速收敛区域中,通过在一组非常短的运行时间上扩展一组约30个多项式的集合,可以实现较高的数值精度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号