Numerical evaluation of virtual corrections to multi-jet production in massless QCD
Numerical evaluation of virtual corrections to multi-jet production in massless QCD
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DOI：
10.1016/j.cpc.2013.03.018
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发表时间：
2012-09
期刊：
影响因子：
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通讯作者：
S. Badger;B. Biedermann;P. Uwer;V. Yundin
中科院分区：
文献类型：
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作者：
S. Badger;B. Biedermann;P. Uwer;V. Yundin
我们提出了一个C++库的数值计算的单圈虚拟修正的多喷流产生的无质量QCD。使用NGluon评估纯胶子原始振幅（Badger等人，（2011）[62]）。利用广义么正约化算法构造了任意重数的费米子-胶子原始振幅。从这些基本的积木的一个循环的贡献，平方矩阵元素，总结了颜色和螺旋度，计算。不进行颜色近似。虽然原始振幅给出了任意的多重性，我们只提供了平方矩阵元素，最多7个外部部分子，允许评估的五个射流横截面在下一个领先的顺序精度。该库最近已成功应用于QCD中下一个领先订单的四个喷气机生产（Badger等人，2012 [92]）。项目摘要：项目名称：NJet目录标识符：AEPF_v1_0项目摘要URL：http://cpc.cs.qub.ac.uk/summaries/AEPF_v1_0.html项目可从：CPC项目图书馆，皇后大学，贝尔法斯特，N。爱尔兰许可条款：GNU通用公共许可证，第3版分布式程序的行数，包括测试数据等：250047分布式程序字节数，包括测试数据等：2138947分发格式：tar.gz编程语言：C++，Python.计算机：PC/工作站。操作系统：无特定要求-在Scientific Linux 5.2上测试。Mac OS X 10.7.4分类：11.5。外部例程：QCDLoop（http：//qcdloop.fnal.gov/）、qd（http：//crd.lbl.gov/dhbailey/mpdist/），均包含在分发文件中。问题性质：无质量QCD解方法中多喷流产生的虚拟修正的评估：基于Berends-Giele递归结合么正性方法获得的树振幅的Pestro数值方法。限制：全彩色和螺旋度加总修正最多只能达到5架最终状态喷气机。运行时间：全色和螺旋度2→4通道的总和大约需要0.5-8秒/点，具体取决于费米子线的数量。在蒙特卡罗积分过程中获得的实际时间将高度依赖于特定的应用。
We present a C++ library for the numerical evaluation of one-loop virtual corrections to multi-jet production in massless QCD. The pure gluon primitive amplitudes are evaluated using NGluon (Badger et al., (2011) [62]). A generalized unitarity reduction algorithm is used to construct arbitrary multiplicity fermion–gluon primitive amplitudes. From these basic building blocks the one-loop contribution to the squared matrix element, summed over colour and helicities, is calculated. No approximation in colour is performed. While the primitive amplitudes are given for arbitrary multiplicities, we provide the squared matrix elements only for up to 7 external partons allowing the evaluation of the five jet cross section at next-to-leading order accuracy. The library has been recently successfully applied to four jet production at next-to-leading order in QCD (Badger et al., 2012 [92]). PROGRAM SUMMARY: Program title:NJet Catalogue identifier: AEPF_v1_0 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEPF_v1_0.html Program obtainable from: CPC Program Library, Queen’s University, Belfast, N. Ireland Licensing provisions: GNU General Public License, version 3 No. of lines in distributed program, including test data, etc.: 250047 No. of bytes in distributed program, including test data, etc.: 2138947 Distribution format: tar.gz Programming language: C++, Python. Computer: PC/Workstation. Operating system: No specific requirements — tested on Scientific Linux 5.2. and Mac OS X 10.7.4. Classification: 11.5. External routines: QCDLoop (http://qcdloop.fnal.gov/), qd (http://crd.lbl.gov/dhbailey/mpdist/), both included in the distribution file. Nature of problem: Evaluation of virtual corrections for multi-jet production in massless QCD Solution method: Purely numerical approach based on tree amplitudes obtained via Berends–Giele recursion combined with unitarity method. Restrictions: Full colour and helicity summed corrections only up to 5 final state jets. Running time: Full colour and helicity summed 2→4 channels take around 0.5–8 s per point depending on the number of fermion lines. Realistic times obtained during Monte Carlo integration will be highly dependent on the specific application.