Determination of αs from hadronic event shapes in e +e − annihilation at [formula omitted] GeV

P Achard,G Carlino,A Favara,M Levtchenko,C Furetta,A Arefiev,V Shoutko,S Schmidt-Kaerst,S Banerjee,M Pauluzzi,A Mihul,K Freudenreich,Yu Galaktionov,B Musicar,S Villa,S Bottai,P Levtchenko,G Baksay,G Coignet,J Ulbricht,L Bellucci,N Batalova,L Romero,M Pedace,D Vicinanza,W Wallraff,A Barczyk,A Kunin,K Lübelsmeyer,S Cucciarelli,E Delmeire,D Pandoulas,I Vetlitsky,F Marzano,J Berdugo,G Chiefari,G Schwering,S Pensotti,C Palomares,H Anderhub,S Costantini,M Rescigno,D Duchesneau,B Zimmermann,G Holzner,M Wadhwa,R Leiste,J Hirschfelder,H Suter,D Perret-Gallix,D Ren,V Pojidaev,A Chen,A Eline,A Shvorob,S Sushkov,P Lebrun,A Rosca,V Plyaskin,C Dionisi,F Denotaristefani,A Ewers,W Kittel,L Servoli,O Grimm,M Basile,P Extermann,C Rosenbleck,F Anselmo,M Vivargent,G Viertel,S Shevchenko,V Koutsenko,G Mirabelli,S Patricelli,K Sudhakar,H Hofer,L Tauscher,M Musy,N Raja,I Clare,J Alcaraz,W Krenz,D Haas,D Hatzifotiadou,S Likhoded,T Siedenburg,M Steuer,G Landi,B Borgia,K Riles,A Lebedev,A Engler,D Käfer,M Chamizo,G Rahal-Callot,G Zilizi,M Capell,B Echenard,M Kräber,T Azemoon,F Pierella,J Salicio,L Baksay,E Fiandrini,S Wynhoff,Y Hu,G Passaleva,E Valente,A Krüger,R Berbeco,R Barillère,S Braccini,N Shivarov,A Bajo,G Ruggiero,P Berges,M Chemarin,P Bartalini,M Lebeau,G Grenier,R Ranieri,E Shumilov,H Nowak,A Gurtu,I Vodopianov,B Stoyanov,M Gataullin,H Milcent,B Bertucci,T Paul,P Déglon,O Adriani,S Saremi,S Reucroft,E Pistolesi,A Böhm,A Bay,B Tellili,M Napolitano,R Ramelli,H Vogt,A Degré,F Behner,M Bourquin,G Alemanni,U Becker,M Dierckxsens,J Casaus,G Sultanov,P.G Rancoita,V Andreev ,T Nießen ,P Bagnaia,S Hou ,B N Jin ,F M Brochu ,J Swain ,Z M Wang ,N Colino,J P Martin ,H El Mamouni ,M Pioppí ,F Cindolo,A Zalite ,C H Lin ,S Nagy,S Riemann,Z P Zhang ,L Merola,G S Muanza ,J G Branson ,F Linde ,L Malgeri,J Quartieri,M Biglietti,W Fisher,M Hohlmann,P Piroué ,M A Rahaman ,D Son,X L Wang ,M Meschini,C Tully,E Sánchez ,M Felcini,M A Falagán ,A Klimentov,A C König ,C Mañá ,A J.m Muijs ,K L Tung ,D J Schotanus ,G Vesztergombi,R De Asmundis ,F Pauß ,G B Mohanty ,J Kirkby,W J Burger ,R Clare,W J Metzger ,L Boldizsár ,H B Newman ,G Organtini,B De La Cruz ,M Dittmar,S Giagu,M Pohl,A Hervé,P Ladrón De Guevara ,S Falciano,S C Yeh ,P Denes,S Sarkar,L Z Sun ,J K Kim ,T Hebbeker,D Schmitz,C Paus,H Vogel,P H Fisher ,O L Fedin ,S Blyth ,H S Chen ,T Aziz,Z Z Xu ,L W Jones ,Z F Gong ,J Pothier,Junjie Zhao ,D Piccolo,S Vlachos,J Fay,D Mangeol,L Taylor,M W Gruenewald ,V K Gupta ,D Bourilkov,M Kopál ,R Paramatti,F Cavallari,S.V Baldew,P Raics,R R Mcneil ,J M Le Goff ,A Straessner,M Guida,Martin Weber ,J H Field ,N Cavallo,D Teyssier,P Lecomte,D Stickland ,M Cerrada,Giovanni Romeo ,M T Dova ,Y H Chang ,G J Bobbink ,Z Szillási ,R Y Zhu ,V A Schegelsky ,H Rykaczewski,A De Salvo ,A Doria,Min Yang ,A Nisati,A Raspereza,J A Van Dalen ,X D Cai ,L Luminari,B L Betev ,C Li,L Gutay ,H G Wilkens ,F Filthaut,H J Yang ,W Lustermann,H Fesefeldt,P Le Coultre ,J Allaby,А Малинин ,B P Roe ,Samuel C.c Ting ,D Prokofiev,P Paolucci,G Chen,K Deiters,J Debreczeni,R Van Gulik ,V Veszprémi ,I Fisk,R Battiston,M Aguilar-Benı́tez ,Z A Liu ,S Rosier‐Lees ,П Спиллантини ,C G Yang ,J J Blaising ,A Zichichi,Y Zalite ,I Vorobiev,Y S Lu ,K Mazumdar,R A Ofierzynski ,S Mele,F J Eppling ,G Y Zhu ,X W Tang ,C Schäfer,J D Burger ,A M Cartacci ,C Cecchi,H.L Zhuang,J A Rubio ,G M Chen ,W Lohmann,Sonia Natale ,F Nessi‐Tedaldi ,C Sciacca,G Forconì ,W Lin ,I Josa-Mutuberrı́A,M P Sanders ,A Sakharov,L Cifarelli,H Schopper,A Biland,S N Ganguli ,P Wienemann,E Longo,P Lecoq,B Roux,M Kaur,B Z Yang ,B A Petersen ,A Aloisio,H F Chen ,S M Ting ,P De Jong ,M Biasini,I B Laktineh ,R Hakobyan ,P Garcı́a-Abia ,J Mans,R T Van De Walle ,R W Kraemer ,F Becattini,M N Kienzle‐Focacci ,J Tóth,A A Vorobyov ,J Yamamoto,S C Tonwar ,J Mnich,L Xia,Stefan Roth ,W G ,T Ferguson,C Luci,L Lista,C Timmermans,D Della Volpe ,P Tarján ,S Gentile,P A Razis ,M G Alviggi ,M Diemoz,Margot Zöller

doi:10.1016/s0370-2693(02)01814-2

Abstract

Results are presented from a study of the structure of high energy hadronic events recorded by the L3 detector at s ⩾192 GeV. The distributions of several event shape variables are compared to resummed O(α s 2) QCD calculations. We determine the strong coupling constant at three average centre-of-mass energies: 194.4, 200.2 and 206.2 GeV. These measurements, combined with previous L3 measurements at lower energies, demonstrate the running of α s as expected in QCD and yield α s( m Z)=0.1227±0.0012±0.0058, where the first uncertainty is experimental and the second is theoretical.

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