Final-sate radiation in electron-positron annihilation into a pion pair

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dc.creatorDubinsky, S.
dc.creatorKorchin, A.
dc.creatorMerenkov, N.
dc.creatorPancheri, G.
dc.creatorShekhovtsova, O.
dc.date2004-11-08
dc.date2004-11-15
dc.date.accessioned2026-07-07T10:29:18Z
dc.date.available2026-07-07T10:29:18Z
dc.descriptionThe process of $e^+e^-$ annihilation into a $π^+π^-$ pair with radiation of a photon is considered. The amplitude of the reaction $e^+e^-\toπ^+π^-γ$ consists of the model independent initial-state radiation (ISR) and model-dependent final-state radiation (FSR). The general structure of the FSR tensor is constructed from Lorentz covariance, gauge invariance and discrete symmetries in terms of the three invariant functions. To calculate these functions we apply Chiral Perturbation Theory (ChPT) with vector and axial-vector mesons. The contribution of $e^+e^-\toπ^+π^-γ$ process to the muon anomalous magnetic moment is evaluated, and results are compared with the dominant contribution in the framework of a hybrid model, consisting of VMD and point-like scalar eletrodynamics. The developed approach allows us also to calculate the $π^+π^-$ charge asymmetry.
dc.description21 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0411113
dc.identifierhttp://arxiv.org/abs/hep-ph/0411113
dc.identifierEur.Phys.J.C40:41-54,2005
dc.identifierdoi:10.1140/epjc/s2004-02109-7
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177753
dc.subjectHigh Energy Physics - Phenomenology
dc.titleFinal-sate radiation in electron-positron annihilation into a pion pair
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