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;

doi:10.1016/0370-2693(90)91268-g

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

Clicks: 239

ID: 272746

1990

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Abstract

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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.

Reference Key	collaboration1990physicsobservation Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
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;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;
Journal	physics letters b
Year	1990
DOI	10.1016/0370-2693(90)91268-g Searching for DOI...
URL	https://sciprofiles.com/publication/view/47d806fa42e593c5b1be53858278c4f7 https://doi.org/10.1016/0370-2693(90)91268-g
Keywords	resonance crystal photon angular mev/c2 doris ηπ0π0

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