Analysis of the 33-133-133-1final state in photon-photon collisions |
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Authors: | K Karch D Antreasyan H W Bartels D Besset Ch Bieler J K Bienlein A Bizzeti E D Bloom " target="_blank">I Brock and K Brockmüller |
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Institution: | K. Karch, D. Antreasyan, H. W. Bartels, D. Besset, Ch. Bieler, J. K. Bienlein, A. Bizzeti, E. D. Bloom, I. Brock and K. Brockmüller, et al. |
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Abstract: | The reactione
+
e
- e
+
e
- 00e
+
e
- 6 has been analysed using the full data sample taken with the Crystal Ball detector at the DORIS II storage ring at DESY. The 00 invariant mass spectrum is dominated by the ', for which we determine the radiative width (') to be (4.5±0.3±0.5)keV. Near 1.9 GeV/c2 we observe a second enhancement in the 00 mass distribution. Assuming that these events are created by the production and subsequent decay of a wide resonanceX(1900), we have investigated the decay modes, the invariant mass distributions of the 0 and 00 subsystems and the angular distributions of the final state mesons. We find that the data is best described byJ
PC=2. For thisJ
P assignment the resonance parameters are (X) BR(X)=(0.95±0.27±0.20) keV tot (X)=(221±92±44)MeV, andM(X)=(1881±32±40) MeV/c2.Deceased |
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