Global Positioning of Spin GPS Scheme for Half-Spin Massive Spinors

Details Global Positioning of Spin GPS Scheme for Half-Spin Massive Spinors Global Positioning of Spin GPS Scheme for Half-Spin Massive Spinors

1999-05-22

arxiv.org/abs/hep-ph/9905452v1

Eur.Phys.J.C22:423-430,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 1 eps figure

Scientific paper

10.1007/s100520100818

We present a simple and flexible method of keeping track of the complex phases and spin quantization axes for half-spin initial- and final-state Weyl spinors in scattering amplitudes of Standard Model high energy physics processes. Both cases of massless and massive spinors are discussed. The method is demonstrated and checked numerically for spin correlations in tau tau-bar production and decay. Its main application will be in the forthcoming work of combining effects due to multiple photon emission (exponentiation) and spin, embodied in the Monte Carlo event generators for production and decay of unstable fermions such as the tau lepton, t-quark and hypothetical new heavy particles.

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