Analysis Of The Eta-Pi-0-Pi-O Final-State In Photon-Photon Collisions

K Karch,D Antreasyan,Hw Bartels,D Besset,C Bieler,Jk Bienlein,A Bizzeti,Ed Bloom,I Brock,K Brockmuller,R Cabenda,A Cartacci, M Cavallisforza, 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,Fh Heimlich,Fh Heinsius, R Hofstadter, J Irion,Z Jakubowski,H Janssen, S Keh,T Kiel,H Kilian,I Kirkbride, T Koiber, M Kobel, W Koch,Ac Konig, K Konigsmann,Rw Kraemer,S Kruger,G Landi, R Lee,S Leffler,R Lekebusch,T Lesiak,Am Litke,W Lockman,S Lowe,B Lurz,D Marlow, H Marsiske, W Maschmann,P Mcbride, F Messing,Wj Metzger,H Meyer,B Monteleoni,B Muryn,R Nernst,B Niczyporuk,G Nowak, C Peck,Pg Pelfer,B Pollock,Fc Porter, D Prindle,P Ratoff, M Reidenbach, B Renger,C Rippich,M Scheer,P Schmitt, J Schotanus,J Schutte,A Schwarz, D Sievers,T Skwarnicki,V Stock,K Strauch,U Strohbusch, J Tompkins,Hj Trost,B Vanuitert,Rt Vandewalle,H Vogel,A Voigt, U Volland,K Wachs,K Wacker,W Walk,H Wegener,Da Williams, P Zschorsch

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS（1992）

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摘要

The reaction e+ e- --> e+e- eta-pi(0)pi(0) --> e+ e- 6-gamma has been analysed using the full data sample taken with the Crystal Ball detector at the DORIS II storage ring at DESY. The eta-pi(0)pi(0) invariant mass spectrum is dominated by the eta', for which we determine the radiative width GAMMA(gamma-gamma)(eta') to be (4.5 +/- 0.3 +/- 0.5) keV. Near 1.9 GeV/c2 we observe a second enhancement in the eta-pi(0)pi(0) mass distribution. Assuming that these events are created by the production and subsequent decay of a wide resonance X(1900), we have investigated the decay modes, the invariant mass distributions of the eta-pi(0) and pi(0)pi(0) subsystems and the angular distributions of the final state mesons. We find that the data is best described by J(PC) = 2-+. For this J(P) assignment the resonance parameters are GAMMA(gamma-gamma)(X) BR (X --> eta-pi-pi) = (0.95 +/- 0.27 +/- 0.20) keV, GAMMA(tot)(X) = (221 +/- 92 +/- 44) MeV, and M(X) = (1881 +/- 32 +/- 40) MeV/c2.

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