Photon radiation in $$e^+e^-;rightarrow ;$$hadrons at low energies with carlomat_3.1 |
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| Authors: | Fred Jegerlehner Karol Kołodziej |
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| Affiliation: | 1.Deutsches Elektronen–Synchrotron (DESY),Zeuthen,Germany;2.Humboldt–Universit?t zu Berlin,Institut für Physik,Berlin,Germany;3.Institute of Physics, University of Silesia,Katowice,Poland |
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| Abstract: | We present a sample of results for the cross sections of several processes of low energetic (e^+e^-) annihilation into final states containing pions accompanied by one or two photons, or a light lepton pair. The results, which have been obtained with a new version of a multipurpose Monte Carlo program carlomat, labelled 3.1, demonstrate new capabilities of the program which, among others, include a possibility of taking into account either the initial or final state radiation separately, or both at a time, and a possibility of inclusion of the electromagnetic charged pion form factor for processes with charged pion pairs. We also discuss some problems related to the U(1) electromagnetic gauge invariance. |
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