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VOLUME 87 | ISSUE 2 | PAGE 81
2γ and 3γ annihilation as calibration processes for high energy e+ e--colliders
E. Bartos^\nabla, S. Bakmaev+, E. A. Kuraev+, M. G. Shatnev*, M.Secansky^{\nabla+}
^\nablaInstitute of Physics, Slovak Academy of Sciences, Bratislava
+Joint Institute for Nuclear Research, 141980 Dubna, Russia
*NSC KIPT, Kharkov, Ukraine


PACS: 12.12.-m, 13.40.-f
Abstract
Born differential cross sections and the lowest-order radiative correction to them are obtained in the kinematics of large-angle final photons emission in high-energy electron-positron annihilation processes. Taking into account possible emission of real soft and hard photons in collinear kinematics we show the validity of the Drell-Yan form of differential cross section with the nonsinglet structure functions of initial leptons. The leading and next-to leading contribution to the cross sections is obtained. The relevant numerical estimations are presented.


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