Observation of a new ηπ0π0 resonance at 1900 MeV/c2 in two-photon scattering

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ID: 272746
1990
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Abstract
Using the Crystal Ball detector at the DORIS II e+e− storage ring, we measure the ηπ0π0 mass spectrum in the reaction e+e−→e+e−ηπ0π0→e+e−6γ from the ηπ0π0 threshold to about 2500 MeV/c2. The spectrum is dominated by the η′, for which we determine Γγγ(η′)BR(η'→6γ)=0.36±0.02±0.03 keV. In addition, we observe an enhancement in the cross section near 1900 MeV/c2 which we attribute to the two-photon production of a new resonance X(1900). The angular distributions and the invariant mass distribution of the ηπ0 subsystem are consistent with those expected for the hypothetical η2 meson with JPC=2−+. For this JP assignment the resonance parameters are M(X) = 1876 ±35±50 MeV/c2, Γtot(X)=228±90±34 MeV/c2 and Γγγ(X)BR(X→ηππ) = 0.9±0.2±0.3 keV.
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Authors K. Karch, D. Antreasyan, H.W. Bartels, D. Besset, Ch. Bieler, J.K. Bienlein, A. Bizzeti, E.D. Bloom, I. Brock, K. Brockmüller, R. Cabenda, A. Cartacci, M. Cavalli-Sforza, R. Clare, A. Compagnucci, G. Conforto, S. Cooper, R. Cowan, D. Coyne, A. Engler, K. Fairfield, G. Folger, A. Fridman, J. Gaiser, D. Gelphman, G. Glaser, G. Godfrey, K. Graaf, F.H. Heimlich, F.H. Heinsius, R. Hofstadter, J. Irion, Z. Jakubowski, H. Janssen, S. Keh, T. Kiel, H. Kilian, I. Kirkbride, T. Kloiber, M. Kobel, W. Koch, A.C. König, K. Königsmann, R.W. Kraemer, S. Krüger, G. Landi, R. Lee, S. Leffler, R. Lekebusch, A.M. Litke, W. Lockman, S. Lowe, B. Lurz, D. Marlow, H. Marsiske, W. Maschmann, P. McBride, F. Messing, W.J. Metzger, H. Meyer, B. Monteleoni, B. Muryn, R. Nernst, B. Niczyporuk, G. Nowak, C. Peck, P.G. Pelfer, B. Pollock, F.C. Porter, D. Prindle, P. Ratoff, M. Reidenbach, B. Renger, C. Rippich, M. Scheer, P. Schmitt, J. Schotanus, J. Schütte, A. Schwarz, D. Sievers, T. Skwarnicki, V. Stock, K. Strauch, U. Strohbusch, J. Tompkins, H.J. Trost, B. Van Uitert, R.T. Van De Walle, H. Vogel, A. Voigt, U. Volland, K. Wachs, K. Wacker, W. Walk, H. Wegener, D.A. Williams, P. Zschorsch, Crystal Ball Collaboration
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Journal physics letters b
Year 1990
DOI
10.1016/0370-2693(90)91268-g
URL
https://sciprofiles.com/publication/view/47d806fa42e593c5b1be53858278c4f7
Keywords
resonance crystal photon angular mev/c2 doris ηπ0π0

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