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  • Analysis of the π + π − π +...
    Achard, P.; Allaby, J.; Aloisio, A.; Baksay, L.; Banerjee, Sw; Bartalini, P.; Berges, P.; Biland, A.; Bobbink, G.J.; Borgia, B.; Bottai, S.; Braccini, S.; Brochu, F.; Burger, J.D.; Cai, X.D.; Capell, M.; Carlino, G.; Cartacci, A.; Cavallari, F.; Cecchi, C.; Chang, Y.H.; Chemarin, M.; Chen, H.F.; Chiefari, G.; Colino, N.; de Asmundis, R.; Diemoz, M.; Dova, M.T.; Echenard, B.; Falagan, M.A.; Favara, A.; Ferguson, T.; Fiandrini, E.; Field, J.H.; Furetta, C.; Ganguli, S.N.; Giagu, S.; Grenier, G.; Gruenewald, M.W.; Haas, D.; Hatzifotiadou, D.; Hofer, H.; Jones, L.W.; Josa-Mutuberría, I.; Kirkby, J.; Klimentov, A.; Kraemer, R.W.; Kunin, A.; Landi, G.; Le Coultre, P.; Levtchenko, M.; Li, C.; Likhoded, S.; Lin, W.T.; Linde, F.L.; Lohmann, W.; Ma, W.G.; Malgeri, L.; Malinin, A.; Martin, J.P.; Mazumdar, K.; Nessi-Tedaldi, F.; Newman, H.; Paolucci, P.; Passaleva, G.; Patricelli, S.; Paus, C.; Pensotti, S.; Piccolo, D.; Piroué, P.A.; Plyaskin, V.; Ramelli, R.; Ranieri, R.; Raspereza, A.; Rosca, A.; Rosier-Lees, S.; Rubio, J.A.; Rykaczewski, H.; Schäfer, C.; Schopper, H.; Schotanus, D.J.; Sciacca, C.; Suter, H.; Tauscher, L.; Teyssier, D.; Timmermans, C.; Tonwar, S.C.; Tóth, J.; Valente, E.; Vasquez, R.; Vivargent, M.; Vlachos, S.; Vogt, H.; Vorobyov, A.A.; Wadhwa, M.; Wang, Z.M.; Wynhoff, S.; Yang, C.G.; Zichichi, A.; Zöller, M.

    Physics letters. B, 07/2006, Letnik: 638, Številka: 2-3
    Journal Article

    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.