A Covariant Method for Calculating Helicity Amplitudes
High Energy Physics - Phenomenology
2014-11-17 v1
Abstract
We present an alternative approach for calculating helicity amplitudes for processes involving both massless and massive fermions. With this method one can easily obtain covariant expressions for the helicity amplitudes. The final expressions involve only four vector products and are independent of the basis for gamma matrices or specific form of the spinors. We use the method to obtain the helicity amplitudes for several processes involving top quark production.
Keywords
Cite
@article{arxiv.hep-ph/9511318,
title = {A Covariant Method for Calculating Helicity Amplitudes},
author = {R. Vega and J. Wudka},
journal= {arXiv preprint arXiv:hep-ph/9511318},
year = {2014}
}
Comments
17 pages, 2 postscript figures, uses Latex2e and associated macros. Tex and Postcript files available via anonymous ftp at ftp://smuphy.physics.smu.edu/pub/vega/ , get hel*.*