Measurement of the Running of the Electromagnetic Coupling at Large Momentum-Transfer at LEP

P Achard,O Adriani,M Aguilar-Benitez,J Alcaraz,G Alemanni,J Allaby,A Aloisio,MG Alviggi,H Anderhub,VP Andreev,F Anselmo,A Arefiev,T Azemoon,T Aziz,P Bagnaia,A Bajo,G Baksay,L Baksay,SV Baldew,S Banerjee,A Barczyk,R Barillere, P Bartilini,M Basile,N Batalova,R Battiston,A Bay,F Becattini,U Becker,F Behner,L Bellucci,R Berbeco,J Berdugo,P Berges,B Bertucci,BL Betev,M Biasini,M Biglietti,A Biland,JJ Blaising,SC Blyth,GJ Bobbink,A Bohm,L Boldizsar,B Borgia,S Bottai,D Bourilkov,M Bourquin,S Braccini,JG Branson,F Brochu,JD Burger,WJ Burger,XD Cai,M Capell,GC Romeo,G Carlino,A Cartacci,J Casaus, E Cavallari,N Cavallo,C Cecchi,M Cerrada,M Chamizo,YH Chang,M Chemarin,A Chen,G Chen,GM Chen,HF Chen,HS Chen,G Chiefari,L Cifarelli,F Cindolo,I Clare,R Clare,G Coignet,N Colino,S Costantini,B de la Cruz,S Cucciarelli,R de Asmundis,P Deglon,J Debreczeni,A Degre,K Dehmelt,K Deiters,D della Volpe,E Delmeire,P Denes,F DeNotaristefani,A De Salvo,M Diemoz,M Dierckxsens,C Dionisi,M Dittmar,A Doria,MT Dova,D Duchesneau,M Duda,B Echenard,A Eline,A El Hage,H El Mamouni,A Engler,FJ Eppling,P Extermann,MA Falagan,S Falciano,A Favara,J Fay,O Fedin,M Felcini,T Ferguson,H Fesefeldt,E Fiandrini,JH Field,F Filthaut,PH Fisher,W Fisher,I Fisk,G Forconi,K Freudenreich,C Furetta,Y Galaktionov,SN Ganguli,P Garcia-Abia,M Gataullin,S Gentile,S Giagu,ZF Gong,G Grenier,O Grimm,MW Gruenewald,M Guida,VK Gupta,A Gurtu,LJ Gutay,D Haas,D Hatzifotiadou,T Hebbeker,A Herve,J Hirschfelder,H Hofer,M Hohlmann,G Holzner,SR Hou,BN Jin,P Jindal,LW Jones,P de Jong,I Josa-Mutuberria,M Kaur,MN Kienzle-Focacci,JK Kim,J Kirkby,W Kittel,A Klimentov,AC Konig,M Kopal,V Koutsenko,M Kraber,RW Kraemer,A Kruger,A Kunin,PL de Guevara,I Laktineh,G Landi,M Lebeau,A Lebedev,P Lebrun,P Lecomte,P Lecoq,P Le Coultre,JM Le Goff,R Leiste,M Levtchenko,P Levtchenko,C Li,S Likhoded,CH Lin,WT Lin,FL Linde,L Lista,ZA Liu,W Lohmann,E Longo,YS Lu,C Luci,L Luminari,W Lustermann,WG Ma,L Malgeri,A Malinin,C Mana,J Mans,JP Martin,F Marzano,K Mazumdar,RR McNeil,S Mele,L Merola,M Meschini,WJ Metzger,A Mihul,H Milcent,G Mirabelli,J Mnich,GB Mohanty,GS Muanza,AJM Muijs,B Musicar,M Musy,S Nagy,S Natale,M Napolitano,F Nessi-Tedaldi,H Newman,A Nisati, I Novak,H Nowak,R Ofierzynski,G Organtini,I Pal,C Palomares,P Paolucci,R Paramatti,G Passaleva,S Patricelli,T Paul,M Pauluzzi,C Paus,F Pauss,M Pedace,S Pensotti,D Perret-Gallix,D Piccolo,F Pierella,M Pioppi,PA Piroue,E Pistolesi,V Plyaskin,M Pohl,V Pojidaev,J Pothier,D Prokofiev,G Rahal-Callot,MA Rahaman,P Raics,N Raja,R Ramelli,PG Rancoita,R Ranieri,A Raspereza,P Razis,D Ren,M Rescigno,S Reucroft,S Riemann,K Riles,BP Roe,L Romero,A Rosca,C Rosemann,C Rosenbleck,S Rosier-Lees,S Roth,JA Rubio,G Ruggiero,H Rykaczewski,A Sakharov,S Saremi, S Sarkar,J Salicio,E Sanchez,C Schafer,V Schegelsky,H Schopper,DJ Schotanus,C Sciacca,L Servoli,S Shevchenko,N Shivarov,V Shoutko,E Shumilov,A Shvorob,D Son,C Souga,P Spillantini,M Steuer,DP Stickland,B Stoyanov,A Straessner,K Sudhakar,G Sultanov,LZ Sun,S Sushkov,H Suter,JD Swain,Z Szillasi,XW Tang,P Tarjan,L Tauscher,L Taylor,B Tellili,D Teyssier,C Timmermans,SCC Ting,SM Ting,SC Tonwar,J Toth,C Tully,KL Tung,J Ulbricht,E Valente,RT Van de Walle,R Vasquez,V Veszpremi,G Vesztergombi,I Vetlitsky,G Viertel,S Villa,M Vivargent,S Vlachos,I Vodopianov,H Vogel,H Vogt,I Vorobiev,AA Vorobyov,M Wadhwa, Q Wang,XL Wang,ZM Wang, M Weber,S Wynhoff,L Xia, ZZ Xu,J Yamamoto,BZ Yang,CG Yang,HJ Yang,M Yang,SC Yeh,A Zalite,Y Zalite,ZP Zhang,J Zhao,GY Zhu,RY Zhu,HL Zhuang,A Zichichi,B Zimmermann,M Zoller

Physics Letters B（2005）

World Lab

被引用25|浏览35

摘要

The evolution of the electromagnetic coupling, alpha, in the momentum-transfer range 1800 GeV2 < -Q(2) < 21600 GeV2 is studied with about 40 000 Bhabha-scattering events collected with the L3 detector at LEP at centre-of-mass energies root s = 189-209 GeV. The running of a is parametrised as:alpha(Q(2)) = (1-C Delta alpha(Q2))/(alpha 0)where alpha(0) = alpha(Q(2) = 0) is the fine-structure constant and C = 1 corresponds to the evolution expected in QED. A fit to the differential cross section of the e(+)e(-) -> e(+)e(-) process for scattering angles in the range vertical bar cos theta vertical bar < 0.9 excludes the hypothesis of a constant value of alpha, C = 0, and validates the QED prediction with the result:C = 1.05 +/- 0.07 +/- 0.14,where the first uncertainty is statistical and the second systematic. (c) 2005 Elsevier B.V. All rights reserved.

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