Determination of αS using OPAL hadronic event shapes at $\sqrt{s} = 91\mbox{--}209~\mathrm{GeV}$ and resummed NNLO calculations
The OPAL Collaboration,G. Abbiendi,C. Ainsley,P. F. Åkesson,G. Alexander,G. Anagnostou,K. J. Anderson,S. Asai,D. Axen,I. Bailey,E. Barberio,T. Barillari,R. J. Barlow,R. J. Batley,P. Bechtle,T. Behnke,K. W. Bell,P. J. Bell,G. Bella,A. Bellerive,G. Benelli,S. Bethke,O. Biebel,O. Boeriu,P. Bock,M. Boutemeur,S. Braibant,R. M. Brown,H. J. Burckhart,S. Campana,P. Capiluppi,R. K. Carnegie,A. A. Carter,J. R. Carter,C. Y. Chang,D. G. Charlton,C. Ciocca,A. Csilling,M. Cuffiani,S. Dado,M. Dallavalle,A. De Roeck,E. A. De Wolf,K. Desch,B. Dienes,J. Dubbert,E. Duchovni,G. Duckeck,I. P. Duerdoth,E. Etzion,F. Fabbri,P. Ferrari,F. Fiedler,I. Fleck,M. Ford,A. Frey,P. Gagnon,J. W. Gary,C. Geich-Gimbel,G. Giacomelli,P. Giacomelli,M. Giunta,J. Goldberg,E. Gross,J. Grunhaus,M. Gruwé,A. Gupta,C. Hajdu,M. Hamann,G. G. Hanson,A. Harel,M. Hauschild,C. M. Hawkes,R. Hawkings,G. Herten,R. D. Heuer,J. C. Hill,D. Horváth,P. Igo-Kemenes,K. Ishii,H. Jeremie,P. Jovanovic,T. R. Junk,J. Kanzaki,D. Karlen,K. Kawagoe,T. Kawamoto,R. K. Keeler,R. G. Kellogg,B. W. Kennedy,S. Kluth,T. Kobayashi,M. Kobel,S. Komamiya,T. Krämer,A. Krasznahorkay,P. Krieger,J. von Krogh,T. Kuhl,M. Kupper,G. D. Lafferty,H. Landsman,D. Lanske,D. Lellouch,J. Letts,L. Levinson,J. Lillich,S. L. Lloyd,F. K. Loebinger,J. Lu,A. Ludwig,J. Ludwig,W. Mader,S. Marcellini,A. J. Martin,T. Mashimo,P. Mättig,J. McKenna,R. A. McPherson,F. Meijers,W. Menges,F. S. Merritt,H. Mes,N. Meyer,A. Michelini,S. Mihara,G. Mikenberg,D. J. Miller,W. Mohr,T. Mori,A. Mutter,K. Nagai,I. Nakamura,H. Nanjo,H. A. Neal,S. W. O’Neale,A. Oh,M. J. Oreglia,S. Orito,C. Pahl,G. Pásztor,J. R. Pater,J. E. Pilcher,J. Pinfold,D. E. Plane,O. Pooth,M. Przybycień,A. Quadt,K. Rabbertz,C. Rembser,P. Renkel,J. M. Roney,A. M. Rossi,Y. Rozen,K. Runge,K. Sachs,T. Saeki,E. K. G. Sarkisyan,A. D. Schaile,O. Schaile,P. Scharff-Hansen,J. Schieck,T. Schörner-Sadenius,M. Schröder,M. Schumacher,R. Seuster,T. G. Shears,B. C. Shen,P. Sherwood,A. Skuja,A. M. Smith,R. Sobie,S. Söldner-Rembold,F. Spano,A. Stahl,D. Strom,R. Ströhmer,S. Tarem,M. Tasevsky,R. Teuscher,M. A. Thomson,E. Torrence,D. Toya,I. Trigger,Z. Trócsányi,E. Tsur,M. F. Turner-Watson,I. Ueda,B. Ujvári,C. F. Vollmer,P. Vannerem,R. Vértesi,M. Verzocchi,H. Voss,J. Vossebeld,C. P. Ward,D. R. Ward,P. M. Watkins,A. T. Watson,N. K. Watson,P. S. Wells,T. Wengler,N. Wermes,G. W. Wilson,J. A. Wilson,G. Wolf,T. R. Wyatt,S. Yamashita,D. Zer-Zion,L. Zivkovic
The European Physical Journal C（2011）
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摘要
Hadronic event shape distributions from e+e− annihilation measured by the OPAL experiment at centre-of-mass energies between 91 GeV and 209 GeV are used to determine the strong coupling α S. The results are based on QCD predictions complete to the next-to-next-to-leading order (NNLO), and on NNLO calculations matched to the resummed next-to-leading-log-approximation terms (NNLO + NLLA). The combined NNLO result from all variables and centre-of-mass energies is while the combined NNLO + NLLA result is The completeness of the NNLO and NNLO + NLLA results with respect to missing higher order contributions, studied by varying the renormalization scale, is improved compared to previous results based on NLO or NLO + NLLA predictions only. The observed energy dependence of α S agrees with the QCD prediction of asymptotic freedom and excludes the absence of running.
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关键词
Systematic Uncertainty,High Energy Phys,Total Uncertainty,Event Shape,Renormalization Scale
