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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; Costa Mezquita, María José; Cortina Gil, Eduardo; Ferrer Soria, Antonio; Fuster Verdú, Juan A.; García García, Carmen; Gil Botella, Inés; Hernández Rey, Juan José; Higón Rodríguez, Emilio; Martínez Vidal, Fernando; Navas Concha, Sergio; Oyanguren Campos, Arantza; Perepelitsa, V.; Salt Cairols, José; Tortosa Martínez, Pablo

Aquest document és un/a article, creat/da en: 2001

Este documento está disponible también en : 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.

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