The radiative return at small angles: virtual corrections
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Virtual corrections for electron-positron annihilation into one real and one off-shell photon of invariant mass \(Q_2\) are evaluated. Special attention is paid to those configurations where the real photon is collinear with the beam direction. This calculation is an important ingredient of a Monte Carlo program, which simulates events with tagged photons from initial-state radiation, including NLO corrections.
KeywordsSmall Angle Beam Direction Important Ingredient Virtual Correction Real Photon
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