Dissociation of the photon to π+π?π0π0 and ωπ0 states |
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Authors: | A B Clegg A Donnachie |
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Institution: | 1. Department of Physics, University of Lancaster, LA1 4YB, Lancaster, UK 2. Department of Physics, University of Manchester, M13 9PL, Manchester, UK
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Abstract: | New measurements of 4π systems, produced by electron-positron annihilation and τ-decay, are analysed in terms of interfering contributions from two ρ′-mesons, ρ′1 and ρ′2, and from the tail of the ρ-meson decaying into two-body states. Separation into orthogonal 4π states, corresponding to different symmetrized isotopic spin wave-functions, is a central feature of the analysis. It is found that the major decay of the ρ′1 is into a 4π state of class 31] and that the major production of 4π states of class 211] for 4π masses below 1.5 GeV is due to the tail of the ρ decaying to ωπ and, probably, toh 1π. Nothing new can be inferred about the decays of ρ′2, and specific needs for improved data are indicated. |
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