Analysis of the ππππ and ππππ final states in quasi-real two-photon collisions at LEP

doi:10.1016/j.physletb.2006.05.006

Analysis of the ππππ and ππππ final states in quasi-real two-photon collisions at LEP

L3 Collaboration
Achard, P.
Adriani, O.
Aguilar-Benitez, M.
Alcaraz, J.
Alemanni, G.
Allaby, J.
Aloisio, A.
Alviggi, M. G.
Anderhub, H.
Andreev, V. P.
Anselmo, F.
Arefiev, A.
Azemoon, T.
Aziz, T.
Bagnaia, P.
Bajo, A.
Baksay, G.
Baksay, L.
Baldew, S. V.
Banerjee, S.
Banerjee, Sw.
Barczyk, A.
Barillère, R.
Bartalini, P.
Basile, M.
Batalova, N.
Battiston, R.
Bay, A.
Becattini, F.
Becker, U.
Behner, F.
Bellucci, L.
Berbeco, R.
Berdugo, J.
Berges, P.
Bertucci, B.
Betev, B. L.
Biasini, M.
Biglietti, M.
Biland, A.
Blaising, J. J.
Blyth, S. C.
Bobbink, G. J.
Böhm, A.
Boldizsar, L.
Borgia, B.
Bottai, S.
Bourilkov, D.
Bourquin, M.
and 303 more

The reactions γγ→ππππ and γγ→ππππ are studied with the L3 detector at LEP in a data sample collected at centre-of-mass energies from 161 GeV to 209 GeV with a total integrated luminosity of 698 pb^-1. A spin-parity-helicity analysis of the ρρ and ρρ systems for two-photon centre-of-mass energies between 1 and 3 GeV 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.