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

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; 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

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

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;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;

physics letters b 1990 Vol. 249 pp. 353-358

159

collaboration1990physicsobservation

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.

Keywords

resonance crystal photon angular mev/c2 doris ηπ0π0

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10.1016/0370-2693(90)91268-g

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