a 2 (1320) and π 2 (1670) formation in the reaction γγ → π + π − π 0

CELLO Collaboration,H. -J. Behrend, L. Criegee,J. H. Field,G. Franke,H. Jung,J. Meyer, O. Podobrin,V. Schröder,G. G. Winter,P. J. Bussey,A. J. Campbell, D. Hendry, S. Lumsdon,I. O. Skillicorn,J. Ahme, V. Blobel,W. Brehm, M. Feind, H. Fenner,J. Harjes,J. H. Köhne,J. H. Peters,H. Spitzer,W. -D. Apel, J. Engler, G. Flügge,D. C. Fries, J. Fuster,P. Gabriel, K. Gamerdinger, P. Grosse-Wiesmann,M. Hahn, U. Hädinger,J. Hansmeyer,H. Küster,H. Müller,K. H. Ranitzsch,H. Schneider,R. Seufert,W. de Boer, G. Buschhorn, G. Grindhammer,B. Gunderson,Ch. Kiesling,R. Kotthaus, H. Kroha, D. Lüers, H. Oberlack, P. Schacht, S. Scholz, W. Wiedenmann, M. Davier, J. F. Grivaz,J. Haissinski, V. Journé,D. W. Kim,F. Le Diberder, J. -J. Veillet, K. Blohm,R. George,M. Goldberg,O. Hamon, F. Kapusta, L. Poggioli, M. Rivoal,G. d'Agostini,F. Ferrarotto,M. Iacovacci, G. Shooshtari,B. Stella, G. Cozzika,Y. Ducros, G. Alexander,A. Beck, G. Bella, J. Grunhaus, A. Klatchko,A. Levy,C. Milsténe

Zeitschrift für Physik C Particles and Fields（1990）

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摘要

The reactione+e−→e+e−π+π−π0 in the untagged mode has been measured with the CELLO detector at PETRA. The cross section is dominated by exclusivea2(1320) production, whose radiative width is determined to beΓγγ=1.00±0.07(stat.)±0.15(syst.)keV. An angular correlation analysis indicates pure helicity 2 with an upper limit on the helicity 0 contribution of 8.2% (at 95% c.l.). Excitation of the pseudotensor meson π 2 0 (1670) is observed for the first time in this reaction. The π2 radiative width and its dependence on interference effects are studied.

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关键词

Field Theory, Correlation Analysis, Elementary Particle, Quantum Field Theory, Interference Effect

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