Np. Merenkov et On. Shekhovtsova, An inclusive approach to scanning e(+)e(-)->pi(+)pi(-) cross section below1 GeV by the radiative-return method, JETP LETTER, 74(2), 2001, pp. 65-71
An inclusive approach to measuring e(+)e(-) --> pi (+)pi (-) cross section
by the radiative-return method is discussed. This approach is substantially
based on the choice of selection rules that exclude three-pion events and
reduce the radiation background in the final state. Radiative corrections i
n the process with emission in the initial state are calculated for the DAP
HNE conditions by treating the cross section form and the kinematics of the
radiative process in the quasi-real electron approximation. (C) 2001 MAIK
"Nauka/Interperiodica".