carlomat_3.1 - a tool for describing photon radiation in electron-positron annihilation to hadrons at low energies

Abstract

A current version of the multipurpose program carlomat offers a possibility of taking into account either the initial-or final-state radiation separately, or both at a time. It allows to include the electromagnetic charged pion form factor in processes with charged pion pairs and to perform the U(1) gauge invariance tests in an easy way. In this paper, I will illustrate how those new capabilities of the program can be utilized in the description of the electron-positron annihilation to hadrons at low energies.