European Physical Journal C Manuscript No. Observation of Resonances in the Reaction Pp ! 0 at 1.94 Gev =c the Crystal Barrel Collaboration
CollaborationA,. Abele,B. Adomeit,C. Amsler,C. A. Baker,B. M. Barnett,C. J. Batty,M. Benayoun,A. Berdoz,K. Beuchert,S. Bischo,P. Bl um,K. Braune,D. V. Bugg,T. Case,O. Cramer,V. Cred,K. M. Crowe,T. Degener,N. Djaoshvili,S. von Dombrowski,M. Doser,W. D unnweber,A. Ehmanns,D. Engelhardt,M. A. Faessler,P. Giaritta,R. P. Haddock,F. H. Heinsius,M. Heinzelmann,A. Herbstrith,M. Herz,N. P. Hessey,P. Hidas,C. Hodd,C. Holtzhau en,D. Jamnik,H. Kalinowsky,B. K ammle,P. Kammel,J. Kisiel,E. Klempt,H. Koch,M. Kunze,U. Kurilla,M. Lakata,R. Landua,J. L udemann,H. Matth ay,R. McCrady,J. Meier,C. A. Meyer,L. Montanet,R. Ouared,F. Ould-Saada,K. Peters,B. Pick,C. Pietra,C. N. Pinder,M. Ratajczak,C. Regenfus,S. Resag,W. R othel,P. Schmidt,R. Seibert,S. Spanier,H. St ock,C. Stra burger,U. Strohbusch,M. Su ert,J. S. Suh,U. Thoma,M. Tischh auser,I. Uman,C. V olcker,S. Wallis,D. Walther,U. Wiedner,K. Wittmack,B. Zou
semanticscholar（2007）
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摘要
Antiproton-proton annihilation into 0 has been studied with the Crystal Barrel spectrometer at CERN at an incident beam momentum of 1.94 GeV/c. The data were taken with a trigger requiring neutral nal states. A new isovector state, the a2(1660) decaying to 0 , is observed. In the invariant mass region around 2.1 GeV=c 2 , strong production of a heavy resonance is required, but our analysis does not distinguish between J P = 0 + , 2 + and 4 +. The production of the f0(1500) in reactions in ight is also observed.
