Weyl-van der Waerden formalism for helicity amplitudes of massive particles - art. no. 016007

Authors
Citation
S. Dittmaier, Weyl-van der Waerden formalism for helicity amplitudes of massive particles - art. no. 016007, PHYS REV D, 5901(1), 1999, pp. 6007
Citations number
36
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
05562821 → ACNP
Volume
5901
Issue
1
Year of publication
1999
Database
ISI
SICI code
0556-2821(19990101)5901:1<6007:WDWFFH>2.0.ZU;2-C
Abstract
The Weyl-van der Waerden spinor technique for calculating helicity amplitud es of massive and massless particles is presented in a form that is particu larly well suited to a direct implementation in computer algebra. Moreover, we explain how to exploit discrete symmetries and how to avoid unphysical poles in amplitudes in practice. The efficiency of the formalism is demonst rated by giving explicit compact results for the helicity amplitudes of the processes gamma gamma -->f (f) over bar, f (f) over bar --> gamma gamma ga mma, mu(-) mu(+) --> f (f) over bar gamma. [S0556-2821(99)02101-3].