Generalized Distribution Amplitudes at the $Z$ pole

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dc.creatorLu, Zhun
dc.creatorSchmidt, Ivan
dc.date2005-11-30
dc.date2006-01-27
dc.date.accessioned2026-07-07T06:50:12Z
dc.date.available2026-07-07T06:50:12Z
dc.descriptionWe investigate the exclusive two-pion production at the $Z$-pole through the process $e^+e^-\to Z \to ππγ$. In the kinematical region where the invariant mass of the two pions is much smaller than the mass of the $Z$ boson, the process can be factorized into the convolution of a hard coefficient and a soft matrix element, the generalized distribution amplitude of two pions. We calculate the differential cross-section of charged pion pair production and neutral pion pair production and find the former to be much larger than the later. We show that combining the measurements of charged pion pair production and neutral pion pair production at the $Z$-pole provides a convenient approach to access the $C$-odd part of the $2π$ distribution amplitudes.
dc.descriptionAnalysis of Bremsstrahlung process added, references and one figure added, misprint corrected,published version
dc.identifierhttps://arxiv.org/abs/hep-ph/0511346
dc.identifierhttp://arxiv.org/abs/hep-ph/0511346
dc.identifierPhys.Rev. D73 (2006) 013012
dc.identifierdoi:10.1103/PhysRevD.73.013012
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/104607
dc.subjectHigh Energy Physics - Phenomenology
dc.titleGeneralized Distribution Amplitudes at the $Z$ pole
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