학술논문
Analysis of the 33-133-133-1final state in photon-photon collisions
Document Type
Original Paper
Author
Karch, K.; Antreasyan, D.; Bartels, H. W.; Besset, D.; Bieler, Ch.; Bienlein, J. K.; Bizzeti, A.; Bloom, E. D.; Brock, I.; Brockmüller, K.; Cabenda, R.; Cartacci, A.; Cavalli-Sforza, M.; Clare, R.; Compagnucci, A.; Conforto, G.; Cooper, S.; Cowan, R.; Coyne, D.; Engler, A.; Fairfield, K.; Folger, G.; Fridman, A.; Gaiser, J.; Gelphman, D.; Glaser, G.; Godfrey, G.; Graaf, K.; Heimlich, F. H.; Heinsius, F. H.; Hofstadter, R.; Irion, J.; Jakubowski, Z.; Janssen, H.; Keh, S.; Kiel, T.; Kilian, H.; Kirkbride, I.; Koiber, T.; Kobel, M.; Koch, W.; König, A. C.; Königsmann, K.; Kraemer, R. W.; Krüger, S.; Landi, G.; Lee, S.; Leffler, S.; Lekebusch, R.; Lesiak, T.; Litke, A. M.; Lockman, W.; Lowe, S.; Lurz, B.; Marlow, D.; Marsiske, H.; Maschmann, W.; McBride, P.; Messing, F.; Metzger, W. J.; Meyer, H.; Monteleoni, B.; Muryn, B.; Nernst, R.; Niczyporul, B.; Nowak, G.; Peck, C.; Pelfer, P. G.; Pollock, B.; Porter, F. C.; Prindle, D.; Ratoff, P.; Reidenbach, M.; Renger, B.; Rippich, C.; Scheer, M.; Schmitt, P.; Schotanus, J.; Schütte, J.; Schwarz, A.; Sievers, D.; Skwarnicki, T.; Stock, V.; Strauch, K.; Strohbusch, U.; Tompkins, J.; Trost, H. J.; van Uitert, B.; Van de Walle, R. T.; Vogel, H.; Voigt, A.; Volland, U.; Wachs, K.; Wacker, K.; Walk, W.; Wegener, H.; Williams, D. A.; Zschorsch, P.; Crystal Ball Collaboration
Source
Zeitschrift für Physik C Particles and Fields. March 1992 54(1):33-44
Subject
Language
English
ISSN
0170-9739
1431-5858
1431-5858
Abstract
The reactione+ e- →e+ e- ηπ0 π0 →e+ e- 6γ has been analysed using the full data sample taken with the Crystal Ball detector at the DORIS II storage ring at DESY. The ηπ0 π0 invariant mass spectrum is dominated by the η', for which we determine the radiative width Γγγ(η') to be (4.5±0.3±0.5)keV. Near 1.9 GeV/c2 we observe a second enhancement in the ηπ0 π0 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 ηπ0 and π0 π0 subsystems and the angular distributions of the final state mesons. We find that the data is best described byJPC =2∓ . For thisJP assignment the resonance parameters are Γγγ (X) BR(X→ηππ)=(0.95±0.27±0.20) keV Γtot (X)=(221±92±44)MeV, andM(X)=(1881±32±40) MeV/c2 .