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Measurement of Strong-Coupling Constant α s to Second Order for 22 <~ s <~ 46.78 GeV

1985; American Physical Society; Volume: 54; Issue: 16 Linguagem: Inglês

10.1103/physrevlett.54.1750

1092-0145

B. Adeva, U. Becker, R. Becker-Szendy, J. Berdugo, Alexandria B. 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. Fesefeldt, D.G. Fong, M. Fukushima, L. Garrido, Ruixiong Han, D. Harting, G. Herten, M. C. Ho, Dorothee Hueser, Mehdi Hussain, M.M. Ilyas, D. Z. Jiang, W. Krenz, P.G. Kuijer, Q. Z. Li, D. Linnhoefer, D. Luckey, E. J. Luit, C. Mañá, M.A. Marquina, M. Martı́nez, G.G.G. Massaro, J. Mnich, R. Mount, K. Nadeem, H. B. Newman, M. Pohl, F. P. Poschmann, R. R. Rau, S. Consuegra Rodŕıguez, M. Rohde, J.A. Rubio, H. Rykaczewski, J. Salicio, Ulrik Schroeder, Howard A. Stone, G. M. Swider, Ping Tang, D. Teuchert, Samuel C.C. Ting, K.L. Tung, M. Q. Wang, M. J. White, Huifang Wu, S.X. Wu, B. Wysłouch, Bo Yang, B. Zhou, R. Y. Zhu,

Particle Accelerators and Free-Electron Lasers

Using the Mark-J detector at the high-energy ${e}^{+}{e}^{\ensuremath{-}}$ 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 $\ensuremath{\Lambda}=100\ifmmode\pm\else\textpm\fi{}{30}_{\ensuremath{-}45}^{+60}$ MeV which yields the strong-coupling constant ${\ensuremath{\alpha}}_{s}=0.12\ifmmode\pm\else\textpm\fi{}0.02$ for $\sqrt{s}=44$ GeV.