Measurement of exclusive $\rho^0 \rho^0$ production in two photon collisions at high $Q^{2}$ at LEP

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 89GeV < \sqrt{s} < 209GeV with a total integrated luminosity of 854.7pb^-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, Wgg, in the kinematic region: 1.2GeV^2 < Q^2 < 30GeV^2 and 1.1GeV < Wgg < 3GeV.

electron positron: colliding beams
exchange: two-photon
rho(770)0: pair production
rho(770)0: hadronic decay
final state: ((n)pi)
channel cross section: momentum transfer
energy dependence
L3
experimental results
CERN LEP Stor

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Figures(22)

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