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.
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; 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 F; 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. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - 62:3(1994), pp. 357-365.
Titolo: | STUDY OF HARD SCATTERING PROCESSES IN MULTIHADRON PRODUCTION FROM GAMMA-GAMMA COLLISIONS AT LEP |
Autori: | |
Data di pubblicazione: | 1994 |
Rivista: | |
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; 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 F; 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. - 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 |