Measurement of the strong-coupling constant alpha s to second order for 22 <= sqrt s <= 46.78 GeV.

B. Adeva,U. Becker,R. Becker-Szendy,J. Berdugo,A. Boehm,J. G. Branson,J.D. Burger,M. Capell,M. Cerrada,C. C. Chang,Y. H. Chang,H. S. Chen,M. Chen,M. L. Chen,M.Y. Chen,E. Deffur,M. Demarteau,B.Z. Dong,P. Duinker,H. S. Fesefeldt,D. Fong,M. Fukushima,L. Garrido,R.D. Han,D. Harting,G. Herten,M. C. Ho,D. Hueser,M. Hussain .,M.M. Ilyas,D. Z. Jiang,W. Krenz,P. Kuijer,Q. Z. Li,D. Linnhoefer,D. Luckey,E. J. Luit,C. Maña,M A Marquina,M. Martinez,G. Massaro,J. Mnich,R Mount,K. Nadeem,H. B. Newman,M. Pohl,F. P. Poschmann,R. R. Rau,S. Rodriguez,M. Rohde,J.A. Rubio,H. Rykaczewski,J. Salicio,U. Schroeder,H. Stone,G. M. Swider,H. W. Tang,D. Teuchert,S.C.C. Ting,K.L. Tung,M. Wang,M. J. White,H.G. Wu,S.X. Wu

Measurement of the strong-coupling constant alpha s to second order for 22 <= sqrt s <= 46.78 GeV.

1985

Using the Mark-J detector at the high-energy e/sup +/e/sup -/ collider PETRA, we compare the data from hadron production with the complete second-order QCD calculation over the energy region 22 to 46.78 GeV. We determine the QCD parameter ..lambda.. = 100 +- 30/sub -/45/sup +65/ MeV which yields the strong-coupling constant ..cap alpha../sub s/ = 0.12 +- 0.02 for ..sqrt..s = 44 GeV.

Keywords:

Particle physics
Condensed matter physics
Physics
Coupling constant
strong coupling
Nuclear physics
Atomic physics

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