Measurement Of Alpha-S From The Structure Of Particle Clusters Produced In Hadronic Z-Decays D Decamp , B Deschizeaux , C Goy , Jp Lees , Mn Minard , R Alemany , Jm Crespo , M Delfino , E Fernandez , V Gaitan , Ll Garrido , P Mato , R Miquel , Lm Mir , S Orteu , A Pacheco , Ja Perlas , E Tubau , Mg Catanesi , D Creanza , M De Palma , A Farilla , G Iaselli , G Maggi , M Maggi , S Natali , S Nuzzo , M Quattromini , A Ranieri , G Raso , F Romano , F Ruggieri , G Selvaggi , L Silvestris , P Tempesta , G Zito , Y Gao , H Hu , D Huang , J Lin , J Lou , C Qiao , T Ruan , T Wang , Y Xie , D Xu , R Xu , J Zhang , W Zhao , H Albrecht , Wb Atwood , F Bird , E Blucher , G Bonvicini , F Bossi , D Brown , Th Burnett , H Drevermann , F Dydak , Rw Forty , C Grab , R Hagelberg , S Haywood , B Jost , M Kasemann , G Kellner , J Knobloch , A Lacourt , I Lehraus , T Lohse , D Luke , M Marchioro , M Martinez , J May , S Menary , A Minten , A Miotto , J Nash , P Palazzi , F Ranjard , G Redlinger , A Roth , J Rothberg , H Rotscheidt , W Von Ruden , R St Denis , D Schlatter , M Takashima , M Talby , W Tejessy , H Wachsmuth , S Wasserbaech , S Wheeler , W Wiedenmann , W Witzeling , J Wotschack , Z Ajaltouni , M Bardadin-Otwinowska , A Falvard , R El Fellous , P Gay , J Harvey , P Henrard , J Jousset , B Michel , Jc Montret , D Pallin , P Perret , J Proriol , F Prulhiere , G Stimpfl , Jd Hansen , Jr Hansen , Ph Hansen , R Mollerud , Er Nielsen , Bs Nilsson , I Efthymiopoulos , E Simopoulou , A Vayaki , J Badier , A Blondel , G Bonneaud , J Bourotte , F Braems , Jc Brient , G Fouque , A Gamess , R Guirlet , A Rosowsky , A Rouge , M Rumpf , R Tanaka , H Videau , Dj Candlin , E Veitch , G Parrini , M Corden , C Georgiopoulos , M Ikeda , J Lannutti , D Levinthal , M Mermikides , L Sawyer , A Antonelli , R Baldini , G Bencivenni , G Bologna , P Campana , G Capon , V Chiarella , B D'Ettorre-Piazzoli , G Felici , P Laurelli , G Mannocchi , F Massimo-Brancaccio , F Murtas , Gp Murtas , G Nicoletti , L Passalacqua , M Pepe-Altarelli , P Picchi , P Zografou , B Altoon , O Boyle , Aw Halley , I Ten Have , Jl Hearns , Jg Lynch , Wt Morton , C Raine , Jm Scarr , K Smith , As Thompson , Rm Turnbull , B Brandl , O Braun , R Geiges , C Geweniger , P Hanke , V Hepp , Ee Kluge , Y Maumary , A Putzer , B Rensch , A Stahl , K Tittel , M Wunsch , At Belk , R Beuselinck , Dm Binnie , W Cameron , M Cattaneo , Pj Dornan , S Dugeay , Am Greene , Jf Hassard , Nm Lieske , Sj Patton , Dg Payne , Mj Phillips , Jk Sedgbeer , G Taylor , Ir Tomalin , Ag Wright , P Girtler , D Kuhn , G Rudolph , Ck Bowdery , Tj Brodbeck , Aj Finch , F Foster , G Hughes , Nr Keemer , M Nuttall , A Patel , Bs Rowlingson , T Sloan , Sw Snow , Ep Whelan , T Barczewski , Lat Bauerdick , K Kleinknecht , B Renk , S Roehn , Hg Sander , M Schmelling , H Schmidt , F Steeg , Jp Albanese , Jj Aubert , C Benchouk , V Bernard , A Bonissent , D Courvoisier , F Etienne , S Papalexiou , P Payre , B Pietrzyk , Z Qian , W Blum , P Cattaneo , G Cowan , B Dehning , H Dietl , M Fernandez-Bosman , T Hansl-Kozanecka , A Jahn , W Kozaneck , E Lange , G Lutjens , G Lutz , W Manner , Hg Moser , Y Pan , R Richter , J Schroder , As Schwarz , R Settles , U Stierlin , J Thomas , G Wolf , V Bertin , G De Bouard , J Boucrot , O Callot , X Chen , A Cordier , M Davier , G Ganis , Jf Grivaz , Ph Heusse , P Janot , V Journe , Dw Kim , J Lefrancois , Am Lutz , Jj Veillet , I Videau , Z Zhang , F Zomer , Sr Amendolia , G Bagliesi , G Batignani , L Bosisio , U Bottigli , C Bradaschia , M Carpinelli , Ma Ciocci , R Dell'Orso , I Ferrante , F Fidecaro , L Foa , E Focardi , F Forti , A Giassi , Ma Giorgi , F Ligabue , A Lusiani , Eb Mannelli , Ps Marrocchesi , A Messineo , L Moneta , F Palla , G Sanguinetti , J Steinberger , R Tenchini , G Tonelli , G Triggiani , C Vannini-Castaldi , A Venturi , Pg Verdini , J Walsh , Jm Carter , Mg Green , Pv March , T Medcalf , Is Quazi , Mr Saich , Ja Strong , Rm Thomas , Lr West , T Wildish , Dr Botterill , Rw Clifft , Tr Edgecock , M Edwards , Sm Fisher , Tj Jones , Pr Norton , Dp Salmon , Jc Thompson , B Bloch-Devaux , P Colas , C Klopfenstein , E Lancon , E Locci , S Loucatos , E Monnier , P Perez , F Perrier , J Rander , Jf Renardy , A Roussarie , Jp Schuller , J Schwindling , Jg Ashman , Cn Booth , C Buttar , R Carney , S Cartwright , F Combley , M Dinsdale , M Dogru , F Hatfield , J Martin , D Parker , P Reeves , Lf Thompson , S Brandt , H Burkhardt , C Grupen , H Meinhard , L Mirabito , E Neugebauer , U Schafer , H Seywerd , G Apollinari , G Giannini , B Gobbo , F Liello , L Rolandi , U Stiegler , L Bellantoni , Jf Boudreau , D Cinabro , Js Conway , Df Cowen , Aj Deweerd , Z Feng , Dps Ferguson , Ys Gao , Jh Grahl , Jl Harton , J Hilgart , Je Jacobsen , Rc Jared , Rp Johnson , Bw Leclaire , Yb Pan , Jr Pater , Y Saadi , V Sharma , Am Walsh , Ja Wear , Fv Weber , Mh Whitney , Slwl Wu , Zl Zhou , G Zobernig PHYSICS LETTERS B（1991）
摘要
Using 106 000 hadronic events obtained with the ALEPH detector at LEP at energies close to the Z resonance peak, the strong coupling constant alpha-s is measured by an analysis of energy-energy correlations (EEC) and the global event shape variables thrust. C-parameter and oblateness. It is shown that the theoretical uncertainties can be significantly reduced if the final state particles are first combined in clusters using a minimum scaled invariant mass cut, y(cut), before these variables are computed. The combined result from all shape variables of pre-clustered events is alpha-s(M(Z)2) = 0.117 +/- 0.005 for a renormalization scale mu = 1/2M(Z). For mu-values between M(Z) and the b-quark mass, the result changes by -0.009(+0.006).
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