hep-ph/9902408 HARD-PHOTON EMISSION IN e + e − → ¯ ff WITH REALISTIC CUTS

نویسنده

  • P. CH. CHRISTOVA
چکیده

We derive compact analytical formulae of the Bonneau-Martin type for the reaction e + e − → ¯ f f γ with cuts on minimal energy and acollinearity of the fermions, where the photons may be emitted both from the initial or final states. Soft photon exponentiation is also taken into account. One of the cleanest scattering processes at elementary particle accelerators is fermion-pair production in e + e − annihilation, potentially accompanied by one or few photons: e + e − → ¯ f f + (n)γ. (1) Initial-state corrections may be written as an integral over the (normalized) invariant mass squared R = s ′ /s of the final-state fermion pair: σ ini T (s) = dR σ 0 (s ′) ρ ini T (R), (2) where σ 0 (s ′) is an effective Born cross-section. The radiator function ρ ini T (R) for the initial-state first-order corrections to the total cross-section σ T , with soft-photon exponentiation, is: ρ ini T (R) =

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تاریخ انتشار 1999