Study of dimuon production in photon-photon collisions and measurement of QED photon structure functions at LEP
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Study of dimuon production in photon-photon collisions and measurement of QED photon structure functions at LEP

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Study of dimuon production in photon-photon collisions and measurement of QED photon structure functions at LEP

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DELPHI Collaboration; Castillo Giménez, María Victoria Perfil; Costa Mezquita, María José; Cortina Gil, Eduardo; Ferrer Soria, Antonio Perfil; Fuster Verdú, Juan A. Perfil; García García, Carmen Perfil; Gil Botella, Inés; Hernández Rey, Juan José Perfil; Higón Rodríguez, Emilio Perfil; Martínez Vidal, Fernando Perfil; Navas Concha, Sergio; Oyanguren Campos, Arantza Perfil; Perepelitsa, V.; Salt Cairols, José Perfil; Tortosa Martínez, Pablo
Aquest document és un/a article, creat/da en: 2001

Este documento está disponible también en : http://dx.doi.org/10.1007/s100520100592
Muon pair production in the process e+e- -> e+e-mu+mu- is studied using the data taken at LEP1 (sqrt(s) \simeq m_Z) with the DELPHI detector during the years 1992-1995. The corresponding integrated luminosity is 138.5 pb^{-1}. The QED predictions have been tested over the whole Q^2 range accessible at LEP1 (from several GeV^2/c^4 to several hundred GeV^2/c^4) by comparing experimental distributions with distributions resulting from Monte Carlo simulations using various generators. Selected events are used to extract the leptonic photon structure function F_2^\gamma. Azimuthal correlations are used to obtain information on additional structure functions, F_A^\gamma and F_B^\gamma, which originate from interference terms of the scattering amplitudes. The measured ratios F_A^\gamma/F_2^\gamma and F_B^\gamma/F_2^\gamma are significantly different from zero and consistent with QED predictions.

    DELPHI Collaboration Castillo Giménez, María Victoria Costa, M. Cortina, E. Costa Mezquita, María José Ferrer Soria, Antonio Fuster Verdú, Juan A. García García, Carmen Gil, I. Hernández Rey, Juan José Higón Rodríguez, Emilio Martínez Vidal, Fernando Navas, S. Oyanguren Campos, Arantza Perepelitsa, V. Salt Cairols, José ,Tortosa Martínez, Pablo, 2001 Study of dimuon production in photon-photon collisions and measurement of QED photon structure functions at LEP European Physical Journal C 19 1 15 28
http://dx.doi.org/10.1007/s100520100592
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