Measurement of the radiative width of theA 2(1320) in two-photon interactions

M. Althoff,W. Braunschweig, R. Gerhards,F. J. Kirschfink,H. -U. Martyn,P. Rosskamp,W. Wallraff,B. Bock,J. Eisenmann,H. M. Fischer,H. Hartmann,A. Jocksch,H. Kolanoski, H. Kück,V. Mertens,R. Wedemeyer,B. Foster,E. Bernardi,Y. Eisenberg,A. Eskreys,K. Gather,H. Hultschig,P. Joos,B. Klima,H. Kowalski,A. Ladage,B. Löhr,D. Lüke,P. Mättig,D. Notz,D. Revel, E. Ronat, D. Trines,T. Tymieniecka,R. Walczak,G. Wolf,W. Zeuner,E. Hilger,T. Kracht, H. L. Krasemann,J. Krüger,E. Lohrmann,G. Poelz,K. U. Pösnecker,D. M. Binnie,P. J. Dornan,D. A. Garbutt,C. Jenkins,W. G. Jones,J. K. Sedgbeer,D. Su,J. Thomas,W. A. T. Wan Abdullah,F. Barreiro,E. Ros,M. G. Bowler,P. Bull,R. J. Cashmore,P. Dauncey,R. Devenish,G. Heath,D. Mellor,P. Ratoff,S. L. Lloyd,G. E. Forden,J. C. Hart,D. K. Hasell,D. H. Saxon,S. Brandt,M. Holder,L. Labarga,B. Neumann,U. Karshon,G. Mikenberg,R. Mir,A. Montag,A. Shapira,G. Yekutieli,G. Baranko,A. Caldwell,M. Cherney,J. M. Izen,S. Ritz, D. Strom,M. Takashima,E. Wicklund,Sau Lan Wu,G. Zonering,TASSO Collaboration

European Physical Journal C（1986）

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摘要

Abstract The reactione +e−→e +e− A2 (1320) has been observed by detecting the decayA 2→π+,π-π0. The two-photon width of theA 2 has been measured to be Г(A 2→γγ)=(0.09±0.27 (stat)±0.16 (syst)) keV. The cross section σ(γ γ→π+,π-π0 has been determined outside theA 2 resonance region.

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关键词

Field Theory, Elementary Particle, Quantum Field Theory, Particle Acceleration, Resonance Region

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