Data di Pubblicazione:
2000
Abstract:
First inclusive measurements of isolated prompt photons in photoproduction at the HERA ep collider have been made with the ZEUS detector, using an integrated luminosity of 38.4 pb(-1) Cross sections are given as a funct ion of the pseudorapidity and the transverse energy (eta(gamma) , E(T)(gamma)) of the photon for E(1)(gamma) > 5 GeV in thr gamma p centre-of-mass energy ranee 133-285 GeV. Comparisons are made with predictions from Monte Carlo models having Icading-logarithm pal-ton showers, and with next-to-leading-order QCD calculations, using currently available parameterisations of the photon structure. For forward eta(gamma) (proton direction) good agreement is found, but in the rear direction all predictions fall below the data. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
ZEUS; CENTRAL TRACKING DETECTOR; JET CROSS-SECTIONS; PARTON DISTRIBUTIONS; HARD SCATTERING; MONTE-CARLO; CONSTRUCTION; CALORIMETER; PROTON; DESIGN
Elenco autori:
J. Breitweg;S. Chekanov;M. Derrick;D. Krakauer;S. Magill;B. Musgrave;A. Pellegrino;J. Repond;R. Stanek;R. Yoshida;M. C. K.;G. Abbiendi;F. Anselmo;P. Antonioli;G. Bari;M. Basile;L. Bellagamba;D. Boscherini;A. Bruni;G. Bruni;G. C. Romeo;G. Castellini;L. Cifarelli;F. Cindolo;A. Contin;N. Coppola;M. Corradi;S. D. Pasquale;P. Giusti;G. Iacobucci;G. Laurenti;G. Levi;A. Margotti;T. Massam;R. Nania;F. Palmonari;A. Pesci;A. Polini;G. Sartorelli;Y. Z. Garcia;A. Zichichi;C. Amelung;A. Bornheim;I. Brock;K. Coboken;J. Crittenden;R. Deffner;H. Hartmann;K. Heinloth;E. Hilger;H. P. Jakob;A. Kappes;U. F. Katz;R. Kerger;E. Paul;J. Rautenberg;H. Schnurbusch;A. Stifutkin;J. Tandler;K. C. Voss;A. Weber;H. Wieber;D. S. Bailey;O. Barret;N. H. Brook;B. Foster;G. P. Heath;H. F. Heath;J. D. McFall;D. Piccioni;E. Rodrigues;J. Scott;R. J. Tapper;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;W. Liu;X. Liu;B. Mellado;R. Sacchi;S. Sampson;F. Sciulli;J. Chwastowski;A. Eskreys;J. Figiel;K. Klimek;K. Olkiewicz;M. B. Przybycien;P. Stopa;L. Zawiejski;L. Adamczyk;B. Bednarek;K. Jelen;D. Kisielewska;A. M. Kowal;T. Kowalski;M. Przybycien;E. Rulikowska-Zarebska;L. Suszycki;J. Zajac;A. Kotanski;L. A. T.;U. Behrens;J. K. Bienlein;C. Burgard;K. Desler;G. Drews;A. Fox-Murphy;U. Fricke;F. Goebel;P. Gottlicher;R. Graciani;T. Haas;W. Hain;G. F. Hartner;D. Hasell;K. Hebbel;K. F. Johnson;M. Kasemann;W. Koch;U. Kotz;H. Kowalski;L. Lindemann;B. Lohr;M. Martinez;M. Milite;T. Monteiro;M. Moritz;D. Notz;F. Pelucchi;M. C. Petrucci;K. Piotrzkowski;M. Rohde;P. R. B.;A. A. Savin;U. Schneekloth;F. Selonke;M. Sievers;S. Stonjek;E. Tassi;G. Wolf;U. Wollmer;C. Youngman;W. Zeuner;C. Coldewey;H. J. Grabosch;A. L. D.;A. Meyer;S. Schlenstedt;P. B. Straub;G. Barbagli;E. Gallo;P. Pelfer;G. Maccarrone;L. Votano;A. Bamberger;S. Eisenhardt;P. Markun;H. Raach;S. Wolfle;P. J. Bussey;A. T. Doyle;S. W. Lee;N. Macdonald;G. J. McCance;D. H. Saxon;L. E. Sinclair;I. O. Skillicorn;R. Waugh;I. Bohnet;N. Gendner;U. Holm;A. Meyer-Larsen;H. Salehi;K. Wick;A. Garfagnini;I. Gialas;L. K. Gladilin;D. Kcira;R. Klanner;E. Lohrmann;G. Poelz;F. Zetsche;R. Goncalo;K. R. Long;D. B. Miller;A. D. Tapper;R. Walker;U. Mallik;S. M. Wang;P. Cloth;D. Filges;T. Ishii;M. Kuze;K. Nagano;K. Tokushuku;S. Yamada;Y. Yamazaki;S. H. Ahn;S. H. An;S. J. Hong;S. B. Lee;S. W. Nam;S. K. Park;H. Lim;I. H. Park;D. Son;F. Barreiro;G. Garcia;C. Glasman;O. Gonzalez;L. Labarga;J. d. Peso;I. Redondo;J. Terron;M. Barbi;F. Corriveau;D. S. Hanna;A. Ochs;S. Padhi;M. Riveline;D. G. Stairs;M. Wing;T. Tsurugai;V. Bashkirov;B. A. Dolgoshein;G. L. Bashindzhagyan;P. F. Ermolov;Y. A. Golubkov;L. A. Khein;N. A. Korotkova;I. A. Korzhavina;V. A. Kuzmin;O. Y. Lukina;A. S. Proskuryakov;L. M. Shcheglova;A. N. Solomin;S. A. Zotkin;C. Bokel;M. Botje;N. Brummer;J. Engelen;E. Koffeman;P. Kooijman;A. v. Sighem;H. Tiecke;N. Tuning;J. J. Velthuis;W. Verkerke;J. Vossebeld;L. Wiggers;E. d. Wolf;B. Bylsma;L. S. Durkin;J. Gilmore;C. M. Ginsburg;C. L. Kim;T. Y. Ling;P. Nylander;S. Boogert;A. M. Cooper-Sarkar;R. C. E.;J. Grosse-Knetter;T. Matsushita;O. Ruske;M. R. Sutton;R. Walczak;A. Bertolin;R. Brugnera;R. Carlin;F. D. Corso;S. Dondana;U. Dosselli;S. Dusini;S. Limentani;M. Morandin;M. Posocco;L. Stanco;R. Stroili;C. Voci;L. Iannotti;B. Y. Oh;J. R. Okrasinski;W. S. Toothacker;J. J. Whitmore;Y. Iga;G. D'Agostini;G. Marini;A. Nigro;C. Cormack;J. C. Hart;N. A. McCubbin;T. P. Shah;D. Epperson;C. Heusch;H. F. W.;A. Seiden;R. Wichmann;D. C. Williams;N. Pavel;H. Abramowicz;S. Dagan;S. Kananov;A. Kreisel;A. Levy;T. Abe;T. Fusayasu;K. Umemori;T. Yamashita;R. Hamatsu;T. Hirose;M. Inuzuka;S. K
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