Data di Pubblicazione:
1997
Abstract:
Events containing an isolated prompt photon with high transverse energy, together with a balancing jet, have been observed for the first time in photoproduction at HERA. The data were taken with the ZEUS detector, in a gamma p centre of mass energy range 120-250 GeV. The fraction of the incoming photon energy participating in the production of the prompt photon and the jet, x(gamma), shows a strong peak near unity, consistent with LO QCD Monte Carlo predictions. In the transverse energy and pseudorapidity range 5 less than or equal to E-T(gamma) < 10 GeV, -0.7 less than or equal to eta(gamma) < 0.8, E-T(jet) greater than or equal to 5 GeV, and -1.5 less than or equal to eta(jet) less than or equal to 1.8, with x(gamma)(OBS) > 0.8, the measured cross section is 15.3 +/- 3.8 +/- 1.8 ph, in good agreement with a recent NLO calculation. (C) 1997 Elsevier Science B.V.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
ZEUS; CENTRAL TRACKING DETECTOR; CROSS-SECTIONS; PARTON DISTRIBUTIONS; COMPTON-SCATTERING; HARD SCATTERING; GLOBAL QCD; COLLISIONS; CONSTRUCTION; CALORIMETER
Elenco autori:
J. Breitweg;M. Derrick;D. Krakauer;S. Magill;D. Mikunas;B. Musgrave;J. Repond;R. Stanek;R. L. Talaga;R. Yoshida;H. Zhang;M. C. K.;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;M. Corradi;S. DePasquale;I. Gialas;P. Giusti;G. Iacobucci;C. Laurenti;G. Levi;A. Margotti;T. Massam;R. Nania;F. Palmonari;A. Pesci;A. Polini;F. Ricci;G. Sartorelli;Y. Z. Garcia;A. Zichichi;C. Amelung;A. Bornheim;I. Brock;K. Coboken;J. Crittenden;R. Deffner;M. Eckert;M. Grothe;H. Hartmann;K. Heinloth;L. Heinz;E. Hilger;H. P. Jakob;U. F. Katz;R. Kerger;E. Paul;M. Pfeiffer;C. Rembser;J. Stamm;R. Wedemeyer;H. Wieber;D. S. Bailey;S. CampbellRobson;W. N. Cottingham;B. Foster;R. HallWilton;M. E. Hayes;G. P. Heath;H. F. Heath;D. Piccioni;D. G. Roff;R. J. Tapper;M. Arneodo;R. Ayad;M. Capua;A. Garfagnini;L. Iannotti;M. Schioppa;G. Susinno;J. Y. Kim;J. H. Lee;I. T. Lim;M. Y. Pac;A. Caldwell;N. Cartiglia;Z. Jing;W. Liu;B. Mellado;J. A. Parsons;S. Ritz;S. Sampson;F. Sciulli;P. B. Straub;Q. Zhu;P. Borzemski;J. Chwastowski;A. Eskreys;Z. Jakubowski;M. B. Przybycien;M. Zachara;L. Zawiejski;L. Adamczyk;B. Bednarek;M. Bukowy;K. Jelen;D. Kisielewska;T. Kowalski;M. Przybycien;E. RulikowskaZarebska;L. Suszycki;J. Zajac;Z. Dulinski;A. Kotanski;G. Abbiendi;L. A. T.;U. Behrens;H. Beier;J. K. Bienlein;G. Cases;O. Deppe;K. Desler;G. Drews;U. Fricke;D. J. Gilkinson;C. Glasman;P. Gottlicher;J. GrosseKnetter;T. Haas;W. Hain;D. Hasell;K. F. Johnson;M. Kasemann;W. Koch;U. Kotz;H. Kowalski;J. Labs;L. Lindemann;B. Lohr;M. Lowe;O. Manczak;J. Milewski;T. Monteiro;J. S. T.;D. Notz;K. Ohrenberg;I. H. Park;A. Pellegrino;F. Pelucchi;K. Piotrzkowski;M. Roco;M. Rohde;J. Roldan;J. J. Ryan;A. A. Savin;U. Schneekloth;F. Selonke;B. Surrow;E. Tassi;T. Voss;D. Westphal;G. Wolf;U. Wollmer;C. Youngman;A. F. Zarnecki;W. Zeuner;B. D. Burow;H. J. Grabosch;A. Meyer;S. Schlenstedt;G. Barbagli;E. Gallo;P. Pelfer;G. Maccarrone;L. Votano;A. Bamberger;S. Eisenhardt;P. Markun;T. Trefzger;S. Wolfle;J. T. Bromley;N. H. Brook;P. J. Bussey;A. T. Doyle;D. H. Saxon;L. E. Sinclair;E. Strickland;M. L. Utley;R. Waugh;A. S. Wilson;I. Bohnet;N. Gendner;U. Holm;A. MeyerLarsen;H. Salehi;K. Wick;L. K. Gladilin;D. Horstmann;D. Kcira;R. Klanner;E. Lohrmann;G. Poelz;W. Schott;F. Zetsche;T. C. Bacon;I. Butterworth;J. E. Cole;V. L. Harris;G. Howell;B. H. Y.;L. Lamberti;K. R. Long;D. B. Miller;N. Pavel;A. Prinias;J. K. Sedgbeer;D. Sideris;A. F. Whitfield;U. Mallik;S. M. Wang;J. T. Wu;P. Cloth;D. Filges;J. I. Fleck;T. Ishii;M. Kuze;M. Nakao;K. Tokushuku;S. Yamada;Y. Yamazaki;S. H. An;S. B. Lee;S. W. Nam;H. S. Park;S. K. Park;F. Barreiro;J. P. Fernandez;G. Garcia;R. Graciani;J. M. Hernandez;L. Hervas;L. Labarga;M. Martinez;J. delPeso;J. Puga;J. Terron;J. F. deTroconiz;F. Corriveau;D. S. Hanna;J. Hartmann;L. W. Hung;J. N. Lim;W. N. Murray;A. Ochs;M. Riveline;D. G. Stairs;M. StLaurent;R. Ullmann;T. Tsurugai;V. Bashkirov;B. A. Dolgoshein;A. Stifutkin;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;F. Chlebana;J. Engelen;P. Kooijman;A. vanSighem;H. Tiecke;N. Tuning;W. Verkerke;J. Vossebeld;M. Vreeswijk;L. Wiggers;E. deWolf;D. Acosta;B. Bylsma;L. S. Durkin;J. Gilmore;C. M. Ginsburg;C. L. Kim;T. Y. Ling;P. Nylander;T. A. Romanowski;H. E. Blaikley;R. J. Cashmore;A. M. CooperSarkar;R. C. E.;J. K. Edmonds;N. Harnew;M. Lancaster;J. D. McFall;C. Nath;V. A. Noyes;A. Quadt;O. Ruske;J. R. Tickner;H. Uijterwaal;R. Walczak;D. S. Waters;A. Bertolin;R. Brugnera;R. Carlin;F. DalC
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