Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-08-23
Phys.Lett. B318 (1993) 217-220
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, preprint number NIKHEF-93-19 (August 1993)
Scientific paper
10.1016/0370-2693(93)91809-2
We present an approximation to the matrix element for the process e+e- --> e+e-gamma, appropriate to the situation where one or both of the fermions are scattered over very small angles. The leading terms in the situation where all scattering angles are small contains not only terms quadratic in the electron mass, but also quartic and even sextic terms must be included. Special attention is devoted to the numerical stability of the resultant expression. Its relation to several existing formulae is discussed.
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