First Evidence Of Hard Scattering Processes In Single Tagged Gamma-Gamma-Collisions

P Abreu, T Spassov,J J Lozano,D Zontar,B Jeanmarie, J Van Eldik,U Mjornmark,C Bosio,D Crennell,G Damgaard,W Ruckstuhl,N I Zimine, A Augustinus,M Kaiser,E K Johansson, R Nicolaidou, D Treille, E N Gazis, P Bogolyubov,F Parodi, H Stack,G Vegni,Sergio Navas, G J Barker, A Ouraou,R Lindner,Stefano Ragazzi,Jan Timmermans, D Radojicic,M Vollmer,A Maltezos,N J Kjaer, L Pape,G Smadja,S Marti,J Bjarne,M L Andrieux, G D Alekseev,J Dolbeau,V Kostioukhine,P Roudeau, E Vlasov,I Siccama, G Valenti,G Grosdidier,W De Boer, S O Holmgren, M Houlden,Jose Salt,P Herquet,G Rinaudo,Cristian Stanescu,A Katargin,J Lemonne, W Ershaidat,G R Smith,P Chliapnikov,W Mitaroff,M Sessa,J Ridky, L Roos,A De Min, G Sciolla, F Scuri, B De Lotto,H Saarikko,M J Bates,A Zalewska, I Mikulec,B Koene, V Hedberg,T B Skaali, A Tomaradze,M Canepa,P Carrilho,W S C Williams,F Martinezvidal,S Katsanevas,S Braibant, K H Becks,T Tabarelli,R Strub, S Stapnes,G Tristram,V Bocci, C Petridou,E Zevgolatakos,O Yushchenko, G Mitselmakher,M Mccubbin,J Guy,E N Tsyganov,A G Olshevski,Ph Gavillet,M Szczekowski,A S Vodopianov,J Cuevas Maestro,J Sanchez,A Kochmehrin,W Venus, P Siegrist,J Straver,S De Brabandere, C Caso, D Fassouliotis,R Mckay,O Smirnova, N Redaelli,R Sekulin, S Nemecek,F J Harris,Y Dufour, P Ronchese,P Negri,C Huet,P S Iversen, D Gele,K Yip,M Battaglia,T Maron,G Ekspong,A N Sisakian,P Billoir,J P Laugier, M Elsing,U Haedinger,T L Hessing,M Zito, C Garcia,A G Frodesen,A M Wetherell,J H Wickens,H T Phillips, M Pegoraro,W Adam, K Doroba, E Graziani, M Voutilainen, A Romero,M Bonesini, L Di Ciaccio, F Verbeure,T Lesiak, P Kluit,F Fuldaquenzer,I Laktineh,O Kouznetsov, J Chauveau, A Stocchi, D A Gillespie,F Hahn,E C Katsoufis,Klaus Monig,B A Khomenko,E Higon,F Pierre, M Margoni,J M Levy,S Haider, M S Bilenky,Jesus Marco, P Vincent, G Sajot,Mark P Richardson,B Tome, T Rovelli, P Paganini,M Caccia,L Jonsson, T Adye, W T Meyer, F Couchot,Y Arnoud,M Michelotto,R Ehret,B Lorstad, T Todorov,B Uberschar, R Fruhwirth,M A Lopez Aguera,G Stavropoulos,M Koratzinos,B Bouquet,Y Sacquin,R Zuberi,J C Marin, A L Read,E Agasi, D Zavrtanik,C De La Vaissiere,C Lambropoulos, R Orava, H Pernegger, M Mazzucato, N Demaria,G Wormser,L Peralta,Y Lemoigne, F Djama, B Asman, T Camporesi,M Los,M Dam,R Contri,P J Holt,P Niss,S Hahn,Pavlos Ioannou,H J Hilke,A Wehr,M Dracos,W Neumann, L G Tkachev,V G Timofeev,S Tzamarias,E Karvelas, D Vilanova, P Antilogus,G Transtromer,H Herr,G Cosme,A Lopezfernandez,I Kronkvist,H De Boeck,F Stichelbaut, R Gokieli,F Naraghi,G Leder, R Brenner,S Blyth, L Cerrito,J M Brunet,W D Apel,M Weierstall, F Carena, C Mariotti,I Roncagliolo,E Vallazza,F Ledroit, F Matorras,F Dupont,G Maehlum,G Polok,M Szeptycka,V Lepeltier,L Tortora, D Bloch,H Palka,P Renton,V Ruhlmannkleider,D Yu Bardin,Tord Ekelof, Piet Van Dam,T A Filippas, M Prest,Elmar Lieb, V Nikolaenko, M Wielers, M Dris,T S Hill, T Tuuva, P Morettini, F Simonetto,S Uberschar,R Jacobsson, A G Myagkov, J N Jackson,F Zach,Th D Papadopoulou,Ph Charpentier, C Bourdarios,R Moller,S Simonetti, G Barbiellini,F Waldner,P Beltran,P Frenkiel,J Dahm,A Sokolov,M Regler,L Vitale,F Bianchi,P Poropat,H Schneider,Henk A Dijkstra, A Tsirou,W Bonivento, V Canale,M Donszelmann,W Bartl,K Kurvinen,O Barring, C Matteuzzi,A M Segar,M Gorski, P Baillon, P Bambade,G Matthiae, P Zalewski,M Winter,V Pozdniakov,R Henriques, C Troncon,V Cassio,C De Saintjean, K Cankocak, P Checchia, P P Allport, A Baroncelli, W Trischuk,Barry King,F Formenti,D C Fries,Mark A Davenport, M Pernicka, K Hultqvist,C Kreuter,G Myatt,P S L Booth,R Barate,I Rippbaudot, N Neumeister,S Plaszczynski,M A E Schyns, A Cattai, W J Murray, T Buran,M C Espirito Santo,R Mcnulty,Josef Strauss,K Hamacher,G Borisov, E Torassa,L Ventura,J Maillard,M Bozzo, E Daubie,C Walck,M Begalli, P N Ratoff, O Botner,J Pennanen,H K Muller,M Pimenta,W Hao,J H Kohne, I Azhinenko,A Buys, R Leitner, C Kourkoumelis,A Tilquin, A De Angelis,L Carroll,A Chan,E I Rosenberg,B Franek, L De Paula,D J Holthuizen,F M L Almeida, E Migliore,J P Gerber,R Pain,N N Khovanski,J J Gomez Y Cadenas,B Bostjancic,M Hahn, B Stugu,R Aleksan,P Rebecchi,C Gaspar,G E Theodosiou, J T Chrin, P D Dauncey,M Gandelman,F Cao, M Feindt,S Bosworth,V Gracco,W Krupinski, G A Chelkov,S Squarcia,I A Tyapkin, T Moa,C Martinezrivero,G Kalmus,Ainsley Normand, P Juillot,M Berggren, C Meroni,A Nomerotski,V Chorowicz,D Gamba,V Chabaud,J Medbo,Demetrios Loukas,F Fontanelli, K Korcyl,L Chaussard, Z D Thome,M Verlato, G Lenzen,D Souzasantos,B Dalmagne, D Liko,L Lanceri,P Kokkinias, G Jarlskog,H Briand,J A Valls Ferrer, R J Apsimon,J Krolikowski,J E Garcia,D Reid, A Perrotta,A Daum,K D Brand, U Gasparini,A Passeri,Walter Van Doninck,P Gunnarsson,O Podobrin,T Bolognese, A Markou,J Baudot,J L Fousset,K Stepaniak,R C Shellard,H Rahmani, F R Cavallo,F Mandl,V A Uvarov,M Baubillier, A Petrolini, J Drees,K Kulka, L Bugge,J A Barrio,M Reale,W Da Silva, Mm Witek, S Czellar,D Edsall,M Bigi, P Branchini,M D M De Fez Laso,V Obraztsov,B Golob,R Keranen, M Calvi,E Rosso, F Barao,P Weilhammer,J L Contreras,Philip G Collins,C De Clercq,G W Van Apeldoorn,V M Golovatyuk, U Amaldi,J Fuster, F L Navarria,J A Hernando,I Stavitski,A Ruiz,I Lippi,G Wilkinson, L Mirabito,J E Augustin,R C A Brown,G Piana,R Lauhakangas,A Seitz,C Defoix,K Woschnagg,R Seufert,P Privitera, M Turala, V Cindro,C Vander Velde,P Langefeld,C Bricman,J Rames,A Hakansson, B S Nielsen,J P Engel,J G Loken, Antonio Ferrer, Z Hajduk,E Fokitis, A Hallgren,L K Resvanis, M V Castillo Gimenez,F Kapusta, P Jarry,A J Camacho Rozas,J J Hernandez,O Ullaland, A Andreazza,M L Turluer,Magnus Karlsson,H Furstenau, A Lipniacka, L Lyons,L S Vertogradov, V Vrba,L Brillault,F Grard, Paulheinz Kramer, D Bertrand,A Klovning,S J Alvsvaag,F Richard,A Zaitsev, C Lacasta, Hansjorg Klein,B Marechal, A Pullia, A Maio,M R Monge, H Wahlen, A Korytov, J Hrubec,S Almehed,K Osterberg, M Sannino,L Gorn,H Foeth,A Firestone, G Crosetti, A C Benvenuti,H B Crawley,T J V Bowcock,E Dahljensen, M Tyndel, G Zumerle,J W Lamsa, E Spiriti, M E Pol,D Z Toet,P F Honore, M Paganoni,K Rybicki,P Beilliere,B Muryn, M Lokajicek, P Delpierre,E Cortina,V Lapin,P Lutz,R Sosnowski,G P Gopal,O G Chikilev,P Jalocha

PHYSICS LETTERS B（1995）

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摘要

For the first time, multihadronic production from single tagged gamma gamma collisions has been studied, where one of the scattered leptons was tagged at very low virtual photon absolute mass squared ([Q(2)] = 0.06 (GeV/c(2))(2)). Data collected during 1991 and 1992 in the DELPHI experiment at LEP are shown to agree well with predictions which included the non-perturbative vector meson dominance model in which the interacting photons are assumed to have converted into a vector meson (rho, omega or pi), a quark-parton model which describes direct photon interactions and a QCD-based model which considers the photon to have quark and gluon structure functions. Five different parametrizations of these structure functions were used and the predictions compared with the data. This study confirms recent results from no-tag experiments in requiring a QCD-based component to successfully describe the data, indicating that the photon has a significant partonic content.

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关键词

parametrization,structure function,photon structure function,particle physics,parton model,non perturbative,data collection

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