Measurement of Exclusive ρ^+ρ^- Production in High-Q^2 Two-Photon Collisions at LEP

Details Measurement of Exclusive ρ^+ρ^- Production in High-Q^2 Two-Photon Collisions at LEP Measurement of Exclusive ρ^+ρ^- Production in High-Q^2 Two-Photon Collisions at LEP

2004-07-12

arxiv.org/abs/hep-ex/0407020v1

Phys.Lett.B597:26-38,2004

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1016/j.physletb.2004.07.013

Exclusive rho^+ rho^- production in two-photon collisions involving a single highly-virtual photon is studied with data collected at LEP at centre-of-mass energies 89 GeV < \sqrt{s} < 209 GeV with a total integrated luminosity of 854.7 pb^-1. The cross section of the process gamma gamma^* -> rho^+ rho^- is determined as a function of the photon virtuality, Q^2, and the two-photon centre-of-mass energy, W_gg, in the kinematic region: 1.2 GeV^2 < Q^2 < 30 GeV^2 and 1.1 GeV < W_gg < 3 GeV. The \rho^+\rho^- production cross section is found to be of the same magnitude as the cross section of the process gamma gamma^* -> rho^0 rho^0, measured in the same kinematic region by L3, and to have similar W_gg and Q^2 dependences.

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