Experimental investigation of the energy dependence of the strong coupling strength

S. Bethke(Heidelberg University), J. Allison(University of Manchester), K. Ambrus(Heidelberg University), R. J. Barlow(University of Manchester), W. Bartel(Deutsches Elektronen-Synchrotron DESY), C.K. Bowdery(Lancaster University), S. L. Cartwright(Rutherford Appleton Laboratory), J. Chrin(University of Manchester), D. Clarke(Rutherford Appleton Laboratory), A. Dieckmann(Heidelberg University), I. P. Duerdoth(University of Manchester), G. Eckerlin(Heidelberg University), E. Elsen(Heidelberg University), R. Felst(Deutsches Elektronen-Synchrotron DESY), A.J. Finch(Lancaster University), F. Foster(Lancaster University), T. Greenshaw(Universität Hamburg), J. Hagemann(Universität Hamburg), D. Haidt(Deutsches Elektronen-Synchrotron DESY), J. Heintze(Heidelberg University), G. Heinzelmann(Universität Hamburg), K.H. Hellenbrand(Heidelberg University), P. Hill(University of Maryland, College Park), G. Hughes(Lancaster University), H. Kado(Lancaster University), K. Kawagoe(The University of Tokyo), C. Kleinwort(Universität Hamburg), G. Knies(Universität Hamburg), T. Kobayashi(The University of Tokyo), S. Komamiya(Heidelberg University), H. Krehbiel(Heidelberg University), J. von Krogh(Heidelberg University), M. Kuhlen(Universität Hamburg), F. K. Loebinger(University of Manchester), A.A. Macbeth(University of Manchester), N. Magnussen(Heidelberg University), R. Marshall(Rutherford Appleton Laboratory), R. Meinke(Universität Hamburg), R. P. Middleton(Rutherford Appleton Laboratory), M. Minowa(The University of Tokyo), P.G. Murphy(University of Manchester), B. Naroska(Lancaster University), J. Nye(Lancaster University), J.E. Olsson(Heidelberg University), F. Ould-Saada(Universität Hamburg), A. Petersen(Universität Hamburg), R. Ramcke(Universität Hamburg), H. Rieseberg(Universität Hamburg), D. Schmidt(Deutsches Elektronen-Synchrotron DESY), H.vd. Schmitt(Heidelberg University), L. Smolík(Heidelberg University), U. Schneekloth(Universität Hamburg), J. A. J. Skard(University of Maryland, College Park), J. Spitzer(Heidelberg University), P. Steffen(University of Manchester), K. Stephens(University of Manchester), A. Wagner(Heidelberg University), I.W. Walker(Lancaster University), P. Warming(University of Manchester), G. Weber(Universität Hamburg), M. Zimmer(Heidelberg University), G. T. Zorn(University of Maryland, College Park)
Physics Letters B
October 1, 1988
10.1016/0370-2693(88)91032-5
Cited by 330Open Access
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Abstract

The energy dependence of the relative production rate of three-jet events is studied in hadronic e+e− annihilation events at center of mass energies between 22 and 46.7 GeV. Three-jet events are defined by a jet finding algorithm which is closely related to the definition of resolvable jets used in O(αs2) perturbative QCD calculations, where the relative production rate of three-jet events is roughly proportional to the size of the strong coupling strength. The production rates of three-jet events in the data decrease significantly with increasing centre of mass energy. The experimental rates, which are independent of fragmentation model calculations, can be directly compared to theoretically calculated jet production rates and are in good agreement with the QCD expectations of a running coupling strength. The hypothesis of an energy independent coupling constant can be excluded with a significance of four standard derivations.

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