EPJ

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EPJ C - Particles and Fields
Particles and Fields


Eur. Phys. J. C 20, 227-231
DOI: 10.1007/s100520100670

Fermion mass effects in $e^+ e^- \rightarrow4f$ and $e^+ e^- \rightarrow 4f\gamma$ with cuts

F. Jegerlehner1 and K. Kolodziej2

1  Deutsches Elektronen-Synchrotron DESY, Platanenallee 6, 15768 Zeuthen, Germany
2  Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40007 Katowice, Poland

(Received: 11 January 2001 / Revised version: 28 March 2001 / Published online: 18 May 2001 -© Springer-Verlag / Società Italiana di Fisica 2001)

Abstract
The fermion mass effects in $e^+ e^- \rightarrow4f$ and in the corresponding bremsstrahlung reactions in the presence of realistic cuts are studied. It is shown that, for some four-fermion final states, the mass effects become sizable to the extent that they may affect the accuracy of theoretical predictions which is required to be better than 1% .



© Società Italiana di Fisica, Springer-Verlag 2001

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