Formation of the pseudoscalars pi 0, eta, and eta ' in the reaction gamma gamma --> gamma gamma.

D. A. WILLIAMS; D. ANTREASYAN; H. W. BARTELS; D. BESSET; C. BIELER; J. K. BIENLEIN; BIZZETI, Andrea; E. D. BLOOM; I. BROCK; K. BROCKMULLER; R. CABENDA; A. CARTACCI; M. CAVALLISFORZA; R. CLARE; A. COMPAGNUCCI; G. CONFORTO; S. COOPER; R. COWAN; D. COYNE; G. DREWS; A. ENGLER; K. H. FAIRFIELD; G. FOLGER; A. FRIDMAN; J. GAISER; D. GELPHMAN; G. GLASER; G. GODFREY; F. H. HEIMLICH; R. HOFSTADTER; J. IRION; Z. JAKUBOWSKI; K. KARCH; S. KEH; H. KILIAN; I. KIRKBRIDE; T. KLOIBER; M. KOBEL; W. KOCH; A. C. KONIG; K. KONIGSMANN; R. W. KRAEMER; S. KRUGER; G. LANDI; R. LEE; S. LEFFLER; R. LEKEBUSCH; W. LOCKMAN; S. LOWE; B. LURZ; D. MARLOW; H. MARSISKE; W. MASCHMANN; P. MCBRIDE; F. MESSING; W. J. METZGER; H. MEYER; B. MONTELEONI; 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. SCHUTTE; A. SCHWARZ; F. SELONKE; D. SIEVERS; T. SKWARNICKI; V. STOCK; K. STRAUCH; U. STROHBUSCH; J. TOMPKINS; H. J. TROST; R. T. VANDEWALLE; H. VOGEL; A. VOIGT; U. VOLLAND; K. WACHS; K. WACKER; W. WALK; H. WEGENER; P. ZSCHORSCH

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IRIS UNIMORE - Archivio istituzionale della ricerca - Università di Modena e Reggio Emilia

Article . 1988

Data sources: IRIS UNIMORE - Archivio istituzionale della ricerca - Università di Modena e Reggio Emilia

https://pubmed.ncbi.nlm.nih.go...

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Formation of the pseudoscalars pi 0, eta, and eta ' in the reaction gamma gamma --> gamma gamma.

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1988 Italy English Journal:Physical review. D, Particles and fields, volume 38 (issn: 0556-2821,

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Authors: D. A. WILLIAMS; D. ANTREASYAN; H. W. BARTELS; D. BESSET; C. BIELER; J. K. BIENLEIN; BIZZETI, Andrea; +85 Authors

pmid: 9959284

handle: 11380/743605

Formation of the pseudoscalars pi 0, eta, and eta ' in the reaction gamma gamma --> gamma gamma.

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Abstract

The Crystal Ball detector has been used at the DORIS II storage ring at DESY to study the reaction e+ e- -> e+ e- gamma* gamma* -> e+ e- X -> e+ e- gamma gamma, where X is a narrow resonance with mass between 100 and 3000 MeV. Formation of pi0, eta and eta' mesons is observed, and the following meson partial widths are obtained: Gamma(pi0 -> gamma gamma) = 7.7+-0.5+-0.5 eV, Gamma(eta -> gamma gamma) = 0.514+-0.017+-0.035 keV, and Gamma(eta' -> gamma gamma) = 4.7+-0.5+-0.5 keV. No other narrow resonances are observed, and upper limits are given for the product Gamma(X -> gamma gamma) B(X -> gamma gamma).

Country

Italy

Related Organizations

University of Modena and Reggio Emilia
Italy

Keywords

gamma-gamma reaction; neutral mesons; Crystal Ball

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