The dijet cross section in photoproduction ha's been measured with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb(-1). The events were required to have a virtuality of the incoming photon, Q(2), of less than 1 GeV(2) and a photon-proton centre-of-mass energy in the range 131 < W(yp) < 277 GeV. Each event contains at least two jets satisfying transverse-energy requirements of E(T)(jet1) > 14 GeV and E(T)(jet2) > 11 GeV and pseudorapidity requirements of -1 < eta(jet1,2) < 2.4. The measurements arc compared to next-to-loading-order QCD predictions. The data show particular sensitivity to the density of partons in the photon, allowing the validity of the current parameterisations to be tested.

Dijet photoproduction at HERA and the structure of the photon

CIRIO, Roberto;COSTA, Marco;MONACO, Vincenzo;PERONI, Cristiana;SACCHI, Roberto;SOLANO, Ada Maria;
2002-01-01

Abstract

The dijet cross section in photoproduction ha's been measured with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb(-1). The events were required to have a virtuality of the incoming photon, Q(2), of less than 1 GeV(2) and a photon-proton centre-of-mass energy in the range 131 < W(yp) < 277 GeV. Each event contains at least two jets satisfying transverse-energy requirements of E(T)(jet1) > 14 GeV and E(T)(jet2) > 11 GeV and pseudorapidity requirements of -1 < eta(jet1,2) < 2.4. The measurements arc compared to next-to-loading-order QCD predictions. The data show particular sensitivity to the density of partons in the photon, allowing the validity of the current parameterisations to be tested.
2002
23
615
631
http://dx.doi.org/10.1007/s100520200936
ZEUS; STRUCTURE-FUNCTION F-2(GAMMA); JET CROSS-SECTIONS; TO-LEADING ORDER; CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; PARTON DISTRIBUTIONS; HADRON-COLLISIONS; LOW-X; Q(2) EVOLUTION; SCATTERING
S. Chekanov;M. Derrick;D. Krakauer;S. Magill;B. Musgrave;A. Pellegrino;J. Repond;R. Yoshida;M. C. K.;P. Antonioli;G. Bari;M. Basile;L. Bellagamba;D. Boscherini;A. Bruni;G. Bruni;G. C. Romeo;L. Cifarelli;F. Cindolo;A. Contin;M. Corradi;S. D. Pasquale;P. Giusti;G. Iacobucci;G. Levi;A. Margotti;T. Massam;R. Nania;F. Palmonari;A. Pesci;G. Sartorelli;A. Zichichi;G. Aghuzumtsyan;D. Bartsch;I. Brock;J. Crittenden;S. Goers;H. Hartmann;E. Hilger;P. Irrgang;H. P. Jakob;A. Kappes;U. F. Katz;R. Kerger;O. Kind;E. Paul;J. Rautenberg;R. Renner;H. Schnurbusch;A. Stifutkin;J. Tandler;K. C. Voss;A. Weber;H. Wessoleck;D. S. Bailey;N. H. Brook;J. E. Cole;B. Foster;G. P. Heath;H. F. Heath;S. Robins;E. Rodrigues;J. Scott;R. J. Tapper;M. Wing;M. Capua;A. Mastroberardino;M. Schioppa;G. Susinno;H. Y. Jeoung;J. Y. Kim;J. H. Lee;I. T. Lim;K. J. Ma;M. Y. Pac;A. Caldwell;M. Helbich;X. Liu;B. Mellado;S. Paganis;W. B. Schmidke;F. Sciulli;J. Chwastowski;A. Eskreys;J. Figiel;K. Olkiewicz;M. B. Przybycien;P. Stopa;L. Zawiejski;B. Bednarek;I. Grabowska-Bold;K. Jelen;D. Kisielewska;A. M. Kowal;M. Kowal;T. Kowalski;B. Mindur;M. Przybycien;E. Rulikowska-Zarebska;L. Suszycki;D. Szuba;J. Szuba;A. Kotanski;W. Slominski;L. A. T.;U. Behrens;K. Borras;V. Chiochia;D. Dannheim;K. Desler;G. Drews;J. Fourletova;A. Fox-Murphy;U. Fricke;A. Geiser;F. Goebel;P. Gottlicher;R. Graciani;T. Haas;W. Hain;G. F. Hartner;S. Hillert;U. Kotz;H. Kowalski;H. Labes;D. Lelas;B. Lohr;R. Mankel;J. Martens;M. Martinez;M. Moritz;D. Notz;M. C. Petrucci;A. Polini;U. Schneekloth;F. Selonke;S. Stonjek;B. Surrow;J. J. Whitmore;R. Wichmann;G. Wolf;C. Youngman;W. Zeuner;C. Coldewey;A. L. D.;A. Meyer;S. Schlenstedt;G. Barbagli;E. Gallo;C. Genta;P. G. Pelfer;A. Bamberger;A. Benen;N. Coppola;P. Markun;H. Raach;S. Wolfle;M. Bell;P. J. Bussey;A. T. Doyle;C. Glasman;S. Hanlon;S. W. Lee;A. Lupi;G. J. McCance;D. H. Saxon;I. O. Skillicorn;B. Bodmann;U. Holm;H. Salehi;K. Wick;A. Ziegler;A. Ziegler;T. Carli;I. Gialas;K. Klimek;E. Lohrmann;M. Milite;C. Collins-Tooth;C. Foudas;R. Goncalo;K. R. Long;F. Metlica;D. B. Miller;A. D. Tapper;R. Walker;P. Cloth;D. Filges;M. Kuze;K. Nagano;K. Tokushuku;S. Yamada;Y. Yamazaki;A. N. Barakbaev;E. G. Boos;N. S. Pokrovskiy;B. O. Zhautykov;S. H. Ahn;S. B. Llee;S. K. Park;H. Lim;D. Son;F. Barreiro;G. Garcia;O. Gonzalez;L. Labarga;J. d. Peso;I. Redondo;J. Terron;M. Vazquez;M. Barbi;A. Bertolin;F. Corriveau;A. Ochs;S. Padhi;D. G. Stairs;M. S. Laurent;T. Tsurugai;A. Antonov;V. Bashkirov;P. Danilov;B. A. Dolgoshein;D. Gladkov;V. Sosnovtsev;S. Suchkov;R. K. Dementiev;P. F. Ermolov;Y. A. Golubkov;I. I. Katkov;L. A. Khein;N. A. Korotkova;I. A. Korzhavina;V. A. Kuzmin;B. B. Levchenko;O. Y. Lukina;A. S. Proskuryakov;L. M. Shcheglova;A. N. Solomin;N. N. Vlasov;S. A. Zotkin;C. Bokel;J. Engelen;S. Grijpink;E. Koffeman;P. Kooijman;E. Maddox;S. Schagen;E. Tassi;H. Tiecke;N. Tuning;J. J. Velthuis;L. Wiggers;E. d. Wolf;N. Brummer;B. Bylsma;L. S. Durkin;J. Gilmore;C. M. Ginsburg;C. L. Kim;T. Y. Ling;S. Boogert;A. M. Cooper-Sarkar;R. C. E.;J. Ferrando;T. Matsushita;M. Rigby;O. Ruske;M. R. Sutton;R. Walczak;R. Brugnera;R. Carlin;F. D. Corso;S. Dusini;A. Garfagnini;S. Limentani;A. Longhin;A. Parenti;M. Posocco;L. Stanco;M. Turcato;L. Adamczyk;B. Y. Oh;P. R. B.;Y. Iga;G. D'Agostini;G. Marini;A. Nigro;C. Cormack;J. C. Hart;N. A. McCubbin;C. Heusch;I. H. Park;N. Pavel;H. Abramowicz;S. Dagan;A. Gabareen;S. Kananov;A. Kreisel;A. Levy;T. Abe;T. Fusayasu;T. Kohno;K. Umemori;T. Yamashita;R. Hamatsu;T. Hirose;M. Inuzuka;S. Kitamura;K. Matsuzawa;T. Nishimura;M. Arneodo;N. Cartiglia;R. Cirio;M. Costa;M. I. Ferrero;S. Maselli;V. Monaco;C. Peroni;M. Ruspa;R. Sacchi;A. Solano;A. Staiano;R. Galea;T. Koop;G. M. Levman;J. F. Martin;A. Mirea;A. Sabetfakhri;J. M. Butterworth;C. Gwenlan;R. Hall-Wilton;M. E. Hayes;E. A. Heaphy;T. W. Jones;J. B. Lane;M. S. Lightwood;B. J. West;J. Ciborowski;R. Ciesielski;G. Grzelak;R. J. Nowak;J. M. Pawlak;B. Smalska;J. Sztuk;T. Tymieniecka;A. Ukleja;J. Ukleja;J. A. Zakrzewski;A. F. Zarnecki;M. Adamus;P. Plucinski;Y. Eisenberg;L. K. Gladilin;D. Hochman;U. Karshon;J. Breitweg;D. Chapin;R. Cross;D. Kcira;S. Lammers;D. D. Reeder;A. A. Savin;W. H. Smith;A. Deshpande;S. Dhawan;V. W. Hughes;P. B. Straub;S. Bhadra;C. D. Catterall;S. Fourletov;S. Menary;M. Soares;J. Standage
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