Measurement of the photon structure function at high Q2 at LEP

M Acciarri,S Bhattacharya,B Bertucci,H Postema,W Kittel,J Berdugo,S Cucciarelli,A Seganti,P Marchesini,P De Jong,G Raven,L Servoli,W Krenz,B De La Cruz,H Nowak,S Wynhoff,B Monteleoni,A Vorvolakos,R Berbeco,D Vicinanza,M Vivargent,S Reucroft,P Bartalini,L Bellucci,M Steuer,M Lebeau,Yu Galaktionov,P Achard,F Marzano,M Chemarin,J Hirschfelder,V Shoutko,F Muheim,A Chen,U Becker,V Plyaskin,M Pedace,A Lebedev,C Furetta,S Schmidt-Kaerst,G Ambrosi,P Lebrun,F Anselmo,E Fiandrini,B Borgia,M Bourquin,T Sztaricskai,L Lugnier,E Valente,G Zilizi,P Berges,T Angelescu,A Robohm,R Ramelli,A Kunin,P Extermann,H El Mamouni,V Koutsenko,G Landi,K Riles,K Freudenreich,M Von Der Mey,J Casaus,S Shevchenko,Yu Zalite,G Grenier,R Faccini,T Azemoon,D Haas,H Hofer,T Siedenburg,D Duchesneau,J Alcaraz,S Saremi,J Ulbricht,R Barillère,M Chamizo,R Leiste,A Shvorob,Y Uchida,B Stoyanov,A Degré,P Déglon,M Gataullin,G Marian,M Musy,A Oulianov,D Ren,S Pensotti,A Buijs,D Pandoulas,A Gurtu,A Mihul,Y Hu,G Castellini,G Mirabelli,G Schwering,R Van Gulik,M Basile,A Favara,H Milcent,G Passaleva,D Dufournaud,J Rodin,A Buffini,A Bajo,N Raja,H Anderhub,H Suter,L Romero,H Vogt,L Fredj,D Luckey,A Bay,D Kiss,M Rescigno,S Braccini,D Ruschmeier,D Perret-Gallix,B Cozzoni,A Engler,P Le Coultre,B Tellili,J Pothier,I Clare,A Barczyk,K Sudhakar,S Banerjee,P Duinker,G Viertel,D Hatzifotiadou,F Di Lodovico,J Salicio,A Rosca,G Holzner,A Hasan,E Pistolesi,D Della Volpe,G Carlino,M Capell,L Tauscher,S Patricelli,E Shumilov,O Grimm,A Balandras,M Pauluzzi,T Paul,D Sciarrino,F Ferroni,G Chiefari,D Van Dierendonck,R De Asmundis,S Costantini,G Alemanni,F Cesaroni,F Pierella,C Palomares,G Rahal-Callot,N Gheordanescu,G Coignet,S Likhoded,C Dionisi,M Wadhwa,A De Salvo,F Cotorobai,T Van Rhee,L Baksay,N Shivarov,M Napolitano,W Wallraff,T Moulik,F Behner,S Villa,Z F Gong ,H Fesefeldt,M Maity,H B Newman ,F J Eppling ,W G ,A Straessner,H J Lee ,B Z Yang ,I.i Vorob'ev ,C Schaefer ,Y H Chang ,M A Rahaman ,G B Mohanty ,F.C Erné,W J Metzger ,M Yang,A M Cartacci ,P Levchenko ,S S Gau ,M Cerrada,N Colino,M Weber,D Stickland ,R W Kraemer ,P Garcı́a-Abia ,A Stone,J H Field ,G M Chen ,L Z Sun ,M Wang,W Lustermann,S Rosier‐Lees ,V Andreev ,B P Roe ,D Prokofev ,C Li,F Cindolo,M W Gruenewald ,F Becattini,А Малинин ,T Nießen ,D Schmitz,L Boldizsár ,L Cifarelli,M Felcini,L Barone,J B Ye ,C Timmermans,D Mangeol,M Kaur,X D Cai ,L Merola,H K Park ,J Quartieri,M Aguilar-Benı́tez ,J D Swain ,I B Laktineh ,J Mans,P Paolucci,S Riemann,I Josa-Mutuberria ,B A Petersen ,A Hervé,Z Xu ,D Piccolo,P Denes,Gennaro De Pascale ,Alexandria B Boehm ,M N Kienzle‐Focacci ,M T Dova ,I Durán ,C Civinini,H G Wilkens ,P.G Rancoita,L Luminari,P Lecoq,R Paramatti,X W Tang ,K L Tung ,A Zichichi,Giovanni Romeo ,R Y Zhu ,Adriaan Koenig ,Hai Yang ,A Zalite ,J P Martin ,S Paoletti,S X Wu ,J M Le Goff ,M Pieri,J A Rubio ,S Falciano,A Biland,J G Branson ,H Schopper,F M Brochu ,Z A Liu ,P Piroué ,N Cavallo,M Meschini,A Nisati,C Cecchi,K Lassila-Perini,S Giagu,E Longo,K Mazumdar,N Produit,P Raics,I.a Vetlitskii ,M P Sanders ,H Rykaczewski,A A Vorobyov ,S Gentile,M Diemoz,Samuel C.C Ting,P Wienemann,G Forconì ,C G Yang ,S Sarkar,M A Falagán ,T Aziz,L Gutay ,P Bagnaia,W Lohmann,B L Betev ,Z Szillási ,E Sánchez ,C Luci,R D’alessandro ,A.v Aref'ev ,D Kim,I Fisk,W Lin ,G Chen,J Fay,G Y Zhu ,A Dominguez,M Biasini,J Allaby,P H Fisher ,X L Wang ,Z M Wang ,T Hebbeker,Péter Molnár ,L Malgeri,S C Tonwar ,H Vogel,A Doria,A Klimentov,U K Chaturvedi ,G J Bobbink ,C Tully,O L Fedin ,I H Park ,S M Ting ,T Ferguson,K Deiters,B N Jin ,F Linde ,S Mele,S Hou ,C Paus,Michel Fabre ,H R Hoorani ,M Pohl,R R Mcneil ,R A Khan ,M E Sarakinos ,M Dittmar,D J Schotanus ,J J Blaising ,S Vlachos,C H Lin ,L W Jones ,V Brigljević ,M Campanelli,J Yamamoto,V Pozhidaev ,Y S Lu ,A Weber,C Sciacca,F Nessi‐Tedaldi ,Á Csilling ,K Luebelsmeyer ,L Xia,П Спиллантини ,T Dai ,R Battiston,F Filthaut,M Kraeber ,H S Chen ,A Aloisio,Z P Zhang ,G Sultanov,F Pauß ,H F Chen ,A K Kopp ,P Hidas,F De Notaristefani ,J Tóth,M G Alviggi ,J Mnich,G Massaro ,P A Razis ,C Mañá ,S C Yeh ,W J Burger ,M Guida,L Lista,D C Son ,L Taylor,D Bourilkov,I Iashvili,J Kirkby,P Lecomte,О Адриани ,G Organtini,I B Vodop'yanov ,A Krüger,R Clare,G Vesztergombi,Bryan Smith ,Virendra K Gupta ,S Blyth ,F Cavallari,J D Burger ,J A Van Dalen ,A Raspereza,G S Muanza ,S N Ganguli ,P Ladrón De Guevara ,A J.m Muijs ,V.a Shchegel'skii ,A P Colijn ,J K Kim ,E Leonardi,M M Zoeller

doi:10.1016/s0370-2693(00)00587-6

Abstract

The structure functions of real and virtual photons are derived from cross section measurements of the reaction e +e −→e +e −+ hadrons at LEP. The reaction is studied at s ≃91 GeV with the L3 detector. One of the final state electrons is detected at a large angle relative to the beam direction, leading to Q 2 values between 40 GeV 2 and 500 GeV 2. The other final state electron is either undetected or it is detected at a four-momentum transfer squared P 2 between 1 GeV 2 and 8 GeV 2. These measurements are compared with predictions of the Quark Parton Model and other QCD based models.

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