ANALYTICAL CALCULATION OF SMALL-ANGLE BHABHA CROSS-SECTION AT LEP1

The analytical approach is applied for description of small angle Bhab ha scattering at LEP1. The QED correction to the Born cross-section is calculated with leading and next-to-leading accuracy in the second or der of the perturbation theory and with leading one in the third order . All contributions due to photos emission and pair production in the second order are calculated starting from essential Feynman diagrams. The third order corrections are computed by means of the electron stru cture function method. Inclusive and calorimeter event selections for asymmetrical wide-narrow circular detectors are investigated.