Year: 2011
Type: article
Abstract: QCD amplitudes with many external fields have been studied for a long time. At tree-level, the amplitudes can be obtained effectively by the Britto-Cachazo-Feng-Witten (BCFW) recursion relations. In this article, we extend the BCFW relations to the QCD amplitude of which the external fields are all massive or include only one massless line. We find such amplitude can be split into two parts and each part of the amplitude is of some correlated spin configuration between the two shifted lines. After choosing proper momentum shift scheme, we can show that each part is constructible directly. Hence, we can obtain a general procedure for the amplitudes in QCD by the BCFW recursion relations. We apply the procedure to several amplitudes as examples. We find such methods are very efficient when there are many massive external fields in the amplitudes.
Author: Gang Chen
Institution: Nanjing University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2018030965