STUDY OF HARD SCATTERING PROCESSES IN MULTIHADRON PRODUCTION FROM GAMMA-GAMMA COLLISIONS AT LEP

Abreu, P; Adam, W; Adye, T; Agasi, E; Aleksan, R; Alekseev, Gd; Allport, P; Almehed, S; Almeida, Fml; Alvsvaag, Sj; Amaldi, U; Andreazza, A; Antilogus, P; Apel, Wd; Apsimon, Rj; Arnoud, Y; Asman, B; Augustin, Je; Augustinus, A; Baillon, P; Bambade, P; Barao, F; Barate, R; Barbiellini, G; Bardin, Dy; Barker, Gj; Baroncelli, A; Barring, O; Barrio, Ja; Bartl, W; Bates, Mj; Battaglia, M; Baubillier, M; Becks, Kh; Begalli, M; Beilliere, P; Belokopytov, Y; Beltran, P; Benvenuti, Ac; Berggren, M; Bertrand, D; Bianchi, F; Bigi, M; Bilenky, Ms; Billoir, P; Bjarne, J; Bloch, D; Blocki, J; Blyth, S; Bocci, V; Bogolubov, Pn; Bolognese, T; Bonesini, M; Bonivento, W; Booth, Psl; Borisov, G; Bosio, C; Bostjancic, B; Bosworth, S; Botner, O; Bouquet, B; Bourdarios, C; Bowcock, Tjv; Bozzo, M; Braibant, S; Branchini, P; Brand, Kd; Brenner, Ra; Briand, H; Bricman, C; Brillault, L; Brown, Rca; Bruckman, P; Brunet, Jm; Budziak, A; Bugge, L; Buran, T; Buys, A; Buytaert, Jama; Caccia, M; Calvi, M; Rozas, Ajc; Campion, R; Camporesi, T; Canale, V; Cankocak, K; Cao, F; Carena, F; Carrilho, P; Carroll, L; Cases, R; Gimenez, Mvc; Cattai, A; Cavallo, Fr; Cerrito, L; Chabaud, V; Chan, A; Chapkin, M; Charpentier, P; Chauveau, J; Checchia, P; Chelkov, Ga; Chevalier, L; Chliapnikov, P; Chorowicz, V; Chrin, Jtm; Cindro, V; Collins, P; Contreras, Jl; Contri, R; Cortina, E; Cosme, G; Couchot, F; Crawley, Hb; Crennell, D; Crosetti, G; Maestro, Jc; Czellar, S; Dahljensen, E; Dahm, J; Dalmagne, B; Dam, M; Damgaard, G; Darbo, G; Daubie, E; Daum, A; Dauncey, Pd; Davenport, M; Davies, J; Dasilva, W; Defoix, C; Delpierre, P; Demaria, N; Deangelis, A; Deboeck, H; Deboer, W; Debrabandere, S; Declerq, C; Laso, Mdmd; Delavaissiere, C; DE LOTTO, Barbara; Demin, A; Depaula, L; Dijkstra, H; Diciaccio, L; Djama, F; Dolbeau, J; Donszelmann, M; Doroba, K; Dracos, M; Drees, J; Dris, M; Dufour, Y; Dupont, F; Edsall, D; Eek, Lo; Ehret, R; Ekelof, T; Ekspong, G; Peisert, Ae; Elsing, M; Engel, Jp; Ershaidat, N; Santo, Me; Fassouliotis, D; Feindt, M; Fenyuk, A; Ferrer, A; Filippas, Ta; Firestone, A; Foeth, H; Fokitis, E; Fontanelli, F; Forbes, Kaj; Formenti, F; Fousset, Jl; Francon, S; Franek, B; Frenkiel, P; Fries, Dc; Frodesen, Ag; Fruhwirth, R; Fuldaquenzer, F; Furstenau, H; Fuster, J; Gamba, D; Gandelman, M; Garcia, C; Garcia, J; Gaspar, C; Gasparini, U; Gavillet, P; Gazis, En; Gerber, Jp; Giacomelli, P; Gillespie, D; Gokieli, R; Golob, B; Golovatyuk, Vm; Cadenas, Jjgy; Gopal, G; Gorn, L; Gorski, M; Gracco, V; Grard, F; Graziani, E; Grosdidier, G; Grossetete, B; Gunnarsson, P; Guy, J; Haedinger, U; Hahn, F; Hahn, M; Hahn, S; Haider, S; Hajduk, Z; Hakansson, A; Hallgren, A; Hamacher, K; Demonchenault, Gh; Hao, W; Harris, Fj; Hedberg, V; Henriques, R; Hernandez, Jj; Hernando, Ja; Herquet, P; Herr, H; Hessing, Tl; Higgins, Co; Higon, E; Hilke, Hj; Hill, Ts; Hodgson, Sd; Hofmokl, T; Holmgren, So; Holt, Pj; Holthuizen, D; Honore, Pf; Houlden, M; Huet, K; Hultqvist, K; Ioannou, P; Iversen, Ps; Jackson, Jn; Jacobsson, R; Jalocha, P; Jarlskog, G; Jarry, P; Jeanmarie, B; Johansson, Ek; Jonker, M; Jonsson, L; Juillot, P; Kaiser, M; Kalkanis, G; Kalmus, G; Kapusta, F; Karlsson, M; Karvelas, E; Katsanevas, S; Katsoufis, Ec; Keranen, R; Khomenko, Ba; Khovanski, Nn; King, B; Kjaer, Nj; Klein, H; Klovning, A; Kluit, P; Kochmehrin, A; Koehne, Jh; Koene, B; Kokkinias, P; Koratzinos, M; Korcyl, K; Korytov, Av; Kostioukhine, V; Kourkoumelis, C; Kouznetsov, O; Kramer, Ph; Krammer, M; Kreuter, C; Krolikowski, J; Kronkvist, I; Krupinski, W; Kucewicz, W; Kulka, K; Kurvinen, K; Lacasta, C; Lambropoulos, C; Lamsa, Jw; Lanceri, L; Langefeld, P; Lapin, V; Last, I; Laugier, Jp; Lauhakangas, R; Leder, G; Ledroit, F; Leitner, R; Lemoigne, Y; Lemonne, J; Lenzen, G; Lepeltier, V; Levy, Jm; Lieb, E; Liko, D; Lindgren, J; Lindner, R; Lipniacka, A; Lippi, I; Loerstad, B; Lokajicek, M; Loken, Jg; Lopezfernandez, A; Aguera, Mal; Los, M; Loukas, D; Lozano, Jj; Lutz, P; Lyons, L; Maehlum, G; Maillard, J; Maio, A; Maltezos, A; Mandl, F; Marco, J; 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The production of multihadronic states in gammagamma collisions at LEP has been studied with the DELPHI detector. The analyzed data correspond to an integrated luminosity of about 32 pb-1, collected in the LEP runs of 1990-1992. Minimum bias data and a sample of events with jets at high p(T) have been selected under the requirement that no scattered electron or positron is observed. The two data sets have been compared to Monte Carlo. predictions. The non-perturbative contribution described by the vector meson dominance Model and direct qqBAR production from pointlike photons described by the quark parton model were found to be insufficient to reproduce the data. It has been necessary to include a third interaction component, which is due to perturbative hard scattering of the partonic constituents of the photon. Several parametrisations of the quark and gluon densities of the photon have been tested. The interplay with the cut in jet transverse momentum, which is necessary for the separation of the perturbative and non-perturbative regions, is discussed. The data favour parametrisations with rather soft partonic content of the photon.

Titolo:	STUDY OF HARD SCATTERING PROCESSES IN MULTIHADRON PRODUCTION FROM GAMMA-GAMMA COLLISIONS AT LEP
Autori:	ABREU P ADAM W ADYE T AGASI E ALEKSAN R ALEKSEEV GD ALLPORT P ALMEHED S ALMEIDA FML ALVSVAAG SJ AMALDI U ANDREAZZA A ANTILOGUS P APEL WD APSIMON RJ ARNOUD Y ASMAN B AUGUSTIN JE AUGUSTINUS A BAILLON P BAMBADE P BARAO F BARATE R BARBIELLINI G BARDIN DY BARKER GJ BARONCELLI A BARRING O BARRIO JA BARTL W BATES MJ BATTAGLIA M BAUBILLIER M BECKS KH BEGALLI M BEILLIERE P BELOKOPYTOV Y BELTRAN P BENVENUTI AC BERGGREN M BERTRAND D BIANCHI F BIGI M BILENKY MS BILLOIR P BJARNE J BLOCH D BLOCKI J BLYTH S BOCCI V BOGOLUBOV PN BOLOGNESE T BONESINI M BONIVENTO W BOOTH PSL BORISOV G BOSIO C BOSTJANCIC B BOSWORTH S BOTNER O BOUQUET B BOURDARIOS C BOWCOCK TJV BOZZO M BRAIBANT S BRANCHINI P BRAND KD BRENNER RA BRIAND H BRICMAN C BRILLAULT L BROWN RCA BRUCKMAN P BRUNET JM BUDZIAK A BUGGE L BURAN T BUYS A BUYTAERT JAMA CACCIA M CALVI M ROZAS AJC CAMPION R CAMPORESI T CANALE V CANKOCAK K CAO F CARENA F CARRILHO P CARROLL L CASES R GIMENEZ MVC CATTAI A CAVALLO FR CERRITO L CHABAUD V CHAN A CHAPKIN M CHARPENTIER P CHAUVEAU J CHECCHIA P CHELKOV GA CHEVALIER L CHLIAPNIKOV P CHOROWICZ V CHRIN JTM CINDRO V COLLINS P CONTRERAS JL CONTRI R CORTINA E COSME G COUCHOT F CRAWLEY HB CRENNELL D CROSETTI G MAESTRO JC CZELLAR S DAHLJENSEN E DAHM J DALMAGNE B DAM M DAMGAARD G DARBO G DAUBIE E DAUM A DAUNCEY PD DAVENPORT M DAVIES J DASILVA W DEFOIX C DELPIERRE P DEMARIA N DEANGELIS A DEBOECK H DEBOER W DEBRABANDERE S DECLERQ C LASO MDMD DELAVAISSIERE C DE LOTTO, Barbara DEMIN A DEPAULA L DIJKSTRA H DICIACCIO L DJAMA F DOLBEAU J DONSZELMANN M DOROBA K DRACOS M DREES J DRIS M DUFOUR Y DUPONT F EDSALL D EEK LO EHRET R EKELOF T EKSPONG G PEISERT AE ELSING M ENGEL JP ERSHAIDAT N SANTO ME FASSOULIOTIS D FEINDT M FENYUK A FERRER A FILIPPAS TA FIRESTONE A FOETH H FOKITIS E FONTANELLI F FORBES KAJ FORMENTI F FOUSSET JL FRANCON S FRANEK B FRENKIEL P FRIES DC FRODESEN AG FRUHWIRTH R FULDAQUENZER F FURSTENAU H FUSTER J GAMBA D GANDELMAN M GARCIA C GARCIA J GASPAR C GASPARINI U GAVILLET P GAZIS EN GERBER JP GIACOMELLI P GILLESPIE D GOKIELI R GOLOB B GOLOVATYUK VM CADENAS JJGY GOPAL G GORN L GORSKI M GRACCO V GRARD F GRAZIANI E GROSDIDIER G GROSSETETE B GUNNARSSON P GUY J HAEDINGER U HAHN F HAHN M HAHN S HAIDER S HAJDUK Z HAKANSSON A HALLGREN A HAMACHER K DEMONCHENAULT GH HAO W HARRIS FJ HEDBERG V HENRIQUES R HERNANDEZ JJ HERNANDO JA HERQUET P HERR H HESSING TL HIGGINS CO HIGON E HILKE HJ HILL TS HODGSON SD HOFMOKL T HOLMGREN SO HOLT PJ HOLTHUIZEN D HONORE PF HOULDEN M HUET K HULTQVIST K IOANNOU P IVERSEN PS JACKSON JN JACOBSSON R JALOCHA P JARLSKOG G JARRY P JEANMARIE B JOHANSSON EK JONKER M JONSSON L JUILLOT P KAISER M KALKANIS G KALMUS G KAPUSTA F KARLSSON M KARVELAS E KATSANEVAS S KATSOUFIS EC KERANEN R KHOMENKO BA KHOVANSKI NN KING B KJAER NJ KLEIN H KLOVNING A KLUIT P KOCHMEHRIN A KOEHNE JH KOENE B KOKKINIAS P KORATZINOS M KORCYL K KORYTOV AV KOSTIOUKHINE V KOURKOUMELIS C KOUZNETSOV O KRAMER PH KRAMMER M KREUTER C KROLIKOWSKI J KRONKVIST I KRUPINSKI W KUCEWICZ W KULKA K KURVINEN K LACASTA C LAMBROPOULOS C LAMSA JW LANCERI L LANGEFELD P LAPIN V LAST I LAUGIER JP LAUHAKANGAS R LEDER G LEDROIT F LEITNER R LEMOIGNE Y LEMONNE J LENZEN G LEPELTIER V LEVY JM LIEB E LIKO D LINDGREN J LINDNER R LIPNIACKA A LIPPI I LOERSTAD B LOKAJICEK M LOKEN JG LOPEZFERNANDEZ A AGUERA MAL LOS M LOUKAS D LOZANO JJ LUTZ P LYONS L MAEHLUM G MAILLARD J MAIO A MALTEZOS A MANDL F MARCO J MARECHAL B MARGONI M MARIN JC MARIOTTI C MARKOU A MARON T MARTI S MARTINEZRIVERO C MARTINEZVIDAL F MATORRAS F MATTEUZZI C MATTHIAE G MAZZUCATO M MCCUBBIN M MCKAY R MCNULTY R MEDBO J MERONI C MEYER WT MICHELOTTO M MIGLIORE E MIKULEC I MIRABITO L MITAROFF WA MITSELMAKHER GV MJOERNMARK U MOA T MOELLER R MOENIG K MONGE MR MORETTINI P MUELLER H MURRAY WJ MURYN B MYATT G NARAGHI F NAVARRIA FL NEGRI P NEMECEK S NEUMANN W NEUMEISTER N NICOLAIDOU R NIELSEN BS NIKOLAENKO V NILSEN PES NISS P NOMEROTSKI A NOVAK N OBRAZTSOV V OLSHEVSKI AG ORAVA R OSTANKOV A OSTERBERG K OURAOU A PAGANINI P PAGANONI M PAIN R PALKA H PAPADOPOULOU TD PAPE L PARODI F PASSERI A PEGORARO M PENNANEN J PERALTA L PEREVOZCHIKOV V PERNEGGER H PERNICKA M PERROTTA A PETRIDOU C PETROLINI A PIANA G PIERRE F PIMENTA M PLASZCZYNSKI S PODOBRIN O POL ME POLOK G POROPAT P POZDNIAKOV V PREST M PRIVITERA P PULLIA A RADOJICIC D RAGAZZI S RAHMANI H RATOFF PN READ AL REALE M REBECCHI P REDAELLI NG REGLER M REID D RENTON PB RESVANIS LK RICHARD F RICHARDSON J RIDKY J RINAUDO G ROMERO A RONCAGLIOLO I RONCHESE P ROSENBERG EI ROSSO E ROUDEAU P ROVELLI T RUCKSTUHL W RUHLMANNKLEIDER V RUIZ A SAARIKKO H SACQUIN Y SAJOT G SALT J SANCHEZ J SANNINO M SCHAEL S SCHNEIDER H SCHYNS MAE SCIOLLA G SCURI, Fabrizio SEGAR AM SEITZ A SEKULIN R SESSA M SEUFERT R SHELLARD RC SICCAMA I SIEGRIST P SIMONETTI S SIMONETTO F SISAKIAN AN SKJEVLING G SMADJA G SMIRNOVA O SMITH GR SOSNOWSKI R SOUZASANTOS D SPASSOV T SPIRITI E SQUARCIA S STAECK H STANESCU C STAPNES S STAVROPOULOS G STICHELBAUT F STOCCHI A STRAUSS J STRAVER J STRUB R STUGU B SZCZEKOWSKI M SZEPTYCKA M SZYMANSKI P TABARELLI T TCHIKILEV O THEODOSIOU GE THOME Z TILQUIN A TIMMERMANS J TIMOFEEV VG TKATCHEV LG TODOROV T TOET DZ TOMARADZE A TOME B TORASSA E TORTORA L TREILLE D TRISCHUK W TRISTRAM G TRONCON C TSIROU A TSYGANOV EN TURLUER ML TUUVA T TYAPKIN IA TYNDEL M TZAMARIAS S UEBERSCHAER B UEBERSCHAER S ULLALAND O UVAROV V VALENTI G VALLAZZA E FERRER JAV VANDERVELDE C VANAPELDOORN GW VANDAM P VANDERHEIJDEN M VANDONINCK WK VANELDIK J VAZ P VEGNI G VENTURA L VENUS W VERBEURE F VERLATO M VERTOGRADOV LS VILANOVA D VINCENT P VITALE L VLASOV E VODOPYANOV AS VOLLMER M VOUTILAINEN M VRBA V WAHLEN H WALCK C WALDNER F WEHR A WEIERSTALL M WEILHAMMER P WETHERELL AM WICKENS JH WIELERS M WILKINSON GR WILLIAMS WSC WINTER M WORMSER G WOSCHNAGG K ZAITSEV A ZALEWSKA A ZAVRTANIK D ZEVGOLATAKOS E ZIMIN NI ZITO M ZONTAR D ZUBERI R ZUMERLE G. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	1994
Rivista:	ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS
Citazione:	STUDY OF HARD SCATTERING PROCESSES IN MULTIHADRON PRODUCTION FROM GAMMA-GAMMA COLLISIONS AT LEP / ABREU P; ADAM W; ADYE T; AGASI E; ALEKSAN R; ALEKSEEV GD; ALLPORT P; ALMEHED S; ALMEIDA FML; ALVSVAAG SJ; AMALDI U; ANDREAZZA A; ANTILOGUS P; APEL WD; APSIMON RJ; ARNOUD Y; ASMAN B; AUGUSTIN JE; AUGUSTINUS A; BAILLON P; BAMBADE P; BARAO F; BARATE R; BARBIELLINI G; BARDIN DY; BARKER GJ; BARONCELLI A; BARRING O; BARRIO JA; BARTL W; BATES MJ; BATTAGLIA M; BAUBILLIER M; BECKS KH; BEGALLI M; BEILLIERE P; BELOKOPYTOV Y; BELTRAN P; BENVENUTI AC; BERGGREN M; BERTRAND D; BIANCHI F; BIGI M; BILENKY MS; BILLOIR P; BJARNE J; BLOCH D; BLOCKI J; BLYTH S; BOCCI V; BOGOLUBOV PN; BOLOGNESE T; BONESINI M; BONIVENTO W; BOOTH PSL; BORISOV G; BOSIO C; BOSTJANCIC B; BOSWORTH S; BOTNER O; BOUQUET B; BOURDARIOS C; BOWCOCK TJV; BOZZO M; BRAIBANT S; BRANCHINI P; BRAND KD; BRENNER RA; BRIAND H; BRICMAN C; BRILLAULT L; BROWN RCA; BRUCKMAN P; BRUNET JM; BUDZIAK A; BUGGE L; BURAN T; BUYS A; BUYTAERT JAMA; CACCIA M; CALVI M; ROZAS AJC; CAMPION R; CAMPORESI T; CANALE V; CANKOCAK K; CAO F; CARENA F; CARRILHO P; CARROLL L; CASES R; GIMENEZ MVC; CATTAI A; CAVALLO FR; CERRITO L; CHABAUD V; CHAN A; CHAPKIN M; CHARPENTIER P; CHAUVEAU J; CHECCHIA P; CHELKOV GA; CHEVALIER L; CHLIAPNIKOV P; CHOROWICZ V; CHRIN JTM; CINDRO V; COLLINS P; CONTRERAS JL; CONTRI R; CORTINA E; COSME G; COUCHOT F; CRAWLEY HB; CRENNELL D; CROSETTI G; MAESTRO JC; CZELLAR S; DAHLJENSEN E; DAHM J; DALMAGNE B; DAM M; DAMGAARD G; DARBO G; DAUBIE E; DAUM A; DAUNCEY PD; DAVENPORT M; DAVIES J; DASILVA W; DEFOIX C; DELPIERRE P; DEMARIA N; DEANGELIS A; DEBOECK H; DEBOER W; DEBRABANDERE S; DECLERQ C; LASO MDMD; DELAVAISSIERE C; DELOTTO B; DEMIN A; DEPAULA L; DIJKSTRA H; DICIACCIO L; DJAMA F; DOLBEAU J; DONSZELMANN M; DOROBA K; DRACOS M; DREES J; DRIS M; DUFOUR Y; DUPONT F; EDSALL D; EEK LO; EHRET R; EKELOF T; EKSPONG G; PEISERT AE; ELSING M; ENGEL JP; ERSHAIDAT N; SANTO ME; FASSOULIOTIS D; FEINDT M; FENYUK A; FERRER A; FILIPPAS TA; FIRESTONE A; FOETH H; FOKITIS E; FONTANELLI F; FORBES KAJ; FORMENTI F; FOUSSET JL; FRANCON S; FRANEK B; FRENKIEL P; FRIES DC; FRODESEN AG; FRUHWIRTH R; FULDAQUENZER F; FURSTENAU H; FUSTER J; GAMBA D; GANDELMAN M; GARCIA C; GARCIA J; GASPAR C; GASPARINI U; GAVILLET P; GAZIS EN; GERBER JP; GIACOMELLI P; GILLESPIE D; GOKIELI R; GOLOB B; GOLOVATYUK VM; CADENAS JJGY; GOPAL G; GORN L; GORSKI M; GRACCO V; GRARD F; GRAZIANI E; GROSDIDIER G; GROSSETETE B; GUNNARSSON P; GUY J; HAEDINGER U; HAHN F; HAHN M; HAHN S; HAIDER S; HAJDUK Z; HAKANSSON A; HALLGREN A; HAMACHER K; DEMONCHENAULT GH; HAO W; HARRIS FJ; HEDBERG V; HENRIQUES R; HERNANDEZ JJ; HERNANDO JA; HERQUET P; HERR H; HESSING TL; HIGGINS CO; HIGON E; HILKE HJ; HILL TS; HODGSON SD; HOFMOKL T; HOLMGREN SO; HOLT PJ; HOLTHUIZEN D; HONORE PF; HOULDEN M; HUET K; HULTQVIST K; IOANNOU P; IVERSEN PS; JACKSON JN; JACOBSSON R; JALOCHA P; JARLSKOG G; JARRY P; JEANMARIE B; JOHANSSON EK; JONKER M; JONSSON L; JUILLOT P; KAISER M; KALKANIS G; KALMUS G; KAPUSTA F; KARLSSON M; KARVELAS E; KATSANEVAS S; KATSOUFIS EC; KERANEN R; KHOMENKO BA; KHOVANSKI NN; KING B; KJAER NJ; KLEIN H; KLOVNING A; KLUIT P; KOCHMEHRIN A; KOEHNE JH; KOENE B; KOKKINIAS P; KORATZINOS M; KORCYL K; KORYTOV AV; KOSTIOUKHINE V; KOURKOUMELIS C; KOUZNETSOV O; KRAMER PH; KRAMMER M; KREUTER C; KROLIKOWSKI J; KRONKVIST I; KRUPINSKI W; KUCEWICZ W; KULKA K; KURVINEN K; LACASTA C; LAMBROPOULOS C; LAMSA JW; LANCERI L; LANGEFELD P; LAPIN V; LAST I; LAUGIER JP; LAUHAKANGAS R; LEDER G; LEDROIT F; LEITNER R; LEMOIGNE Y; LEMONNE J; LENZEN G; LEPELTIER V; LEVY JM; LIEB E; LIKO D; LINDGREN J; LINDNER R; LIPNIACKA A; LIPPI I; LOERSTAD B; LOKAJICEK M; LOKEN JG; LOPEZFERNANDEZ A; AGUERA MAL; LOS M; LOUKAS D; LOZANO JJ; LUTZ P; LYONS L; MAEHLUM G; MAILLARD J; MAIO A; MALTEZOS A; MANDL F; MARCO J; MARECHAL B; MARGONI M; MARIN JC; MARIOTTI C; MARKOU A; MARON T; MARTI S; MARTINEZRIVERO C; MARTINEZVIDAL F; MATORRAS F; MATTEUZZI C; MATTHIAE G; MAZZUCATO M; MCCUBBIN M; MCKAY R; MCNULTY R; MEDBO J; MERONI C; MEYER WT; 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VEGNI G; VENTURA L; VENUS W; VERBEURE F; VERLATO M; VERTOGRADOV LS; VILANOVA D; VINCENT P; VITALE L; VLASOV E; VODOPYANOV AS; VOLLMER M; VOUTILAINEN M; VRBA V; WAHLEN H; WALCK C; WALDNER F; WEHR A; WEIERSTALL M; WEILHAMMER P; WETHERELL AM; WICKENS JH; WIELERS M; WILKINSON GR; WILLIAMS WSC; WINTER M; WORMSER G; WOSCHNAGG K; ZAITSEV A; ZALEWSKA A; ZAVRTANIK D; ZEVGOLATAKOS E; ZIMIN NI; ZITO M; ZONTAR D; ZUBERI R; ZUMERLE G. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - 62:3(1994), pp. 357-365.
Abstract:	The production of multihadronic states in gammagamma collisions at LEP has been studied with the DELPHI detector. The analyzed data correspond to an integrated luminosity of about 32 pb-1, collected in the LEP runs of 1990-1992. Minimum bias data and a sample of events with jets at high p(T) have been selected under the requirement that no scattered electron or positron is observed. The two data sets have been compared to Monte Carlo. predictions. The non-perturbative contribution described by the vector meson dominance Model and direct qqBAR production from pointlike photons described by the quark parton model were found to be insufficient to reproduce the data. It has been necessary to include a third interaction component, which is due to perturbative hard scattering of the partonic constituents of the photon. Several parametrisations of the quark and gluon densities of the photon have been tested. The interplay with the cut in jet transverse momentum, which is necessary for the separation of the perturbative and non-perturbative regions, is discussed. The data favour parametrisations with rather soft partonic content of the photon.
Handle:	http://hdl.handle.net/11390/884614
Appare nelle tipologie:	1.1 Articolo in rivista

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