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

DataBETA

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

DELPHI

Collaboration

Feb, 2000

23 pages

Published in:

Eur.Phys.J.C 19 (2001) 15-28

e-Print:

hep-ex/0105084 [hep-ex]

DOI:

10.1007/s100520100592

Report number:

CERN-EP-2000-150

Experiments:

CERN-LEP-DELPHI

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Abstract: (arXiv)

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.

electron positron: colliding beams
exchange: two-photon
photon photon: interaction
muon: pair production
photon: structure function
structure function: leptonic
angular correlation
scattering amplitude: interference
quantum electrodynamics: validity test
DELPHI

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Figures(0)

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