Analysis of the pi^+pi^-pi^+pi^- and pi^+pi^0pi^-pi^0 Final States in Quasi-Real Two-Photon Collisions at LEP

Details Analysis of the pi^+pi^-pi^+pi^- and pi^+pi^0pi^-pi^0 Final States in Quasi-Real Two-Photon Collisions at LEP Analysis of the pi^+pi^-pi^+pi^- and pi^+pi^0pi^-pi^0 Final States in Quasi-Real Two-Photon Collisions at LEP

2006-05-08

arxiv.org/abs/hep-ex/0605021v1

Phys.Lett.B638:128-139,2006

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1016/j.physletb.2006.05.006

The reactions gamma gamma -> pi^+pi^-pi^+pi^- and gamma gamma -> pi^+pi^0pi^-pi^0 are studied with the L3 detector at LEP in a data sample collected at centre-of-mass energies from 161GeV to 209GeV with a total integrated luminosity of 698/pb. A spin-parity-helicity analysis of the rho^0 rho^0 and rho^+ rho^- systems for two-photon centre-of-mass energies between 1GeV and 3GeV shows the dominance of the spin-parity state 2+ with helicity 2. The contribution of 0+ and 0- spin-parity states is also observed, whereas contributions of 2- states and of a state with spin-parity 2+ and zero helicity are found to be negligible.

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