An analysis of the charged and neutral energy flow in e+e− hadronic annihilation at 34 GeV, and a determination of the QCD effective coupling constant
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An analysis of the charged and neutral energy flow in e+e− hadronic annihilation at 34 GeV, and a determination of the QCD effective coupling constant

H.J. Behrend,Ch. Chen,H. Fenner,J.H. Field,V. Schröder,H. Sindt,G. D'agostini,W.D. Apel,S. Banerjee,J. Bodenkamp,D. Chrobaczek,J. Engler,G. Flügge,D.C. Fries,W. Fues,K. Gamerdinger,G. Hopp,H. Küster,H. Müller,H. Randoll,G. Schmidt,H. Schneider,W. De Boer,G. Buschhorn,G. Grindhammer,P. Grosse-Wiesmann,B. Gunderson,C. Kiesling,R. Kotthaus,U. Kruse,H. Lierl,D. Lüers,T. Meyer,H. Oberlack,P. Schacht,M.J. Schachter,A. Snyder,G. Carnesecchi,P. Colas,A. Cordier,M. Davier,D. Fournier,J.F. Grivaz,J. Haïssinski,V. Journé,Andre Klarsfeld,F. Laplanche,F. Le Diberder,U. Mallik,J.J. Veillet,R. George,M. Goldberg,B. Grossetěte,O. Hamon,F. Kapusta,F. Kovacs,G. London,L. Poggioli,M. Rivoal,R. Aleksan,J. Bouchez,G. Cozzika,Y. Ducros,A. Gaidot,S. Jadach,Y. Lavagne,J. Pamela,J.P. Pansart,F. Pierre;H.J. Behrend;Ch. Chen;H. Fenner;J.H. Field;V. Schröder;H. Sindt;G. D'agostini;W.D. Apel;S. Banerjee;J. Bodenkamp;D. Chrobaczek;J. Engler;G. Flügge;D.C. Fries;W. Fues;K. Gamerdinger;G. Hopp;H. Küster;H. Müller;H. Randoll;G. Schmidt;H. Schneider;W. De Boer;G. Buschhorn;G. Grindhammer;P. Grosse-Wiesmann;B. Gunderson;C. Kiesling;R. Kotthaus;U. Kruse;H. Lierl;D. Lüers;T. Meyer;H. Oberlack;P. Schacht;M.J. Schachter;A. Snyder;G. Carnesecchi;P. Colas;A. Cordier;M. Davier;D. Fournier;J.F. Grivaz;J. Haïssinski;V. Journé;Andre Klarsfeld;F. Laplanche;F. Le Diberder;U. Mallik;J.J. Veillet;R. George;M. Goldberg;B. Grossetěte;O. Hamon;F. Kapusta;F. Kovacs;G. London;L. Poggioli;M. Rivoal;R. Aleksan;J. Bouchez;G. Cozzika;Y. Ducros;A. Gaidot;S. Jadach;Y. Lavagne;J. Pamela;J.P. Pansart;F. Pierre;
physics letters b 1982 Vol. 113 pp. 427-432
163
pierre1982physicsan

Abstract

Using both charged and neutral components, 2600 multihadronic e+e− annihilation events, recorded at 34 GeV by the CELLO detector at PETRA, have been analysed in a calometric approach. The fraction of energy carried by gamma rays is measured to be fγ = (26.0 ± 0.4 (stat) ± 4.0 (syst)%. The neutral energy flow is seen to follow closely the overall energy flow. From the corrected oblateness distribution, a first order determination of αs is performed. The result is αs = 0.16 ± 0.01 (stat) ± 0.03 (syst).

Keywords

energy flow gamma ray coupling constant first order

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DOI:
10.1016/0370-2693(82)90778-x
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