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Experimental proof of the existence of the A1 meson
Authors:C Daum  L Hertzberger  W Hoogland  S Peters  P van Deurzen  V Chabaud  B Hyams  H Tiecke  P Weilhammer  A Dwurazny  G Polok  M Rozanska  M Turala  J Turnau  H Becker  G Blanar  M Cerrada  F Wickens
Institution:NIKHEF-H, Amsterdam, The Netherlands;CERN, Geneva, Switzerland;Institute of Nuclear Physics, Cracow, Poland;Max-Planck-Institut für Physik and Astrophysik, Munich, Fed. Rep. Germany
Abstract:In partial wave analyses of the (π?π?π+) system, substantial shape changes of the 1+S () intensity as a function of t, and relative phase changes of ≈ 90°, provide compelling evidence for a resonant A1 of mass ≈ 1280 MeV and width ≈ 300 MeV.
Keywords:The ACCMOR Collaboration
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