Observation of isolated high-ET photons in photoproduction at HERA

Observation of isolated high-ET photons in photoproduction at HERA

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. Mattingly,F. Anselmo,P. Antonioli,G. Bari,M. Basile,L. Bellagamba,D. Boscherini,A. Bruni,G. Bruni,G. Cara Romeo,G. Castellini,L. Cifarelli,F. Cindolo,A. Contin,M. Corradi,Salvatore De Pasquale,I. Gialas,P. Giusti,G. Iacobucci,G. Laurenti,G. Levi,A. Margotti,T. Massam,R. Nania,F. Palmonari,A. Pesci,A. Polini,F. Ricci,G. Sartorelli,Y. Zamora Garcia,A. Zichichi,C. Amelung,A. Bornheim,I. Brock,K. Coböken,J. Crittenden,R. Deffner,M. Eckert,M. Grothe,H. Hartmann,K. Heinloth,L. Heinz,E. Hilger,H.-P. Jakob,Uli Katz,R. Kerger,E. Paul,M. Pfeiffer,Ch. Rembser,J. Stamm,R. Wedemeyer,H. Wieber,David C Bailey,S. Campbell-Robson,W. N. Cottingham,B. Foster,R. Hall-Wilton,M. E. Hayes,G. P. Heath,Helen Heath,D. Piccioni,D. G. Roff,R. J. Tapper,Michele Arneodo,R. Ayad,Marcella 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,Janusz Chwastowski,A. Eskreys,Z. Jakubowski,Mariusz Przybycien,M. Zachara,Leszek Zawiejski,Leszek Adamczyk,B. Bednarek,M. Bukowy,K. Jeleń,D. Kisielewska,T. Kowalski,E. Rulikowska-Zarȩbska,L. Suszycki,J. Zaja̧c,Z. Duliński,A. Kotański,Giovanni Abbiendi,L. A. T. Bauerdick,U. Behrens,H. Beier,J. K. Bienlein,G. Cases,O. Deppe,K. Desler,G. Drews,U. Fricke,D. J. Gilkinson,Claudia Glasman,P. Göttlicher,J. Grosse-Knetter,Tobias M. Haas,W. Hain,D. Hasell,K. F. Johnson,Matthias Kasemann,W. Koch,U. Kötz,J. Labs,L. Lindemann,B. Löhr,M. Löwe,O. Mańczak,J. Milewski,T. Monteiro,J. S. T. Ng,D. Notz,K. Ohrenberg,I. H. Park,A. Pellegrino,F. Pelucchi,K. Piotrzkowski,M. Roco,M. Rohde,J. Roldán,J. J. Ryan,A. A. Savin,U. Schneekloth,F. Selonke,B. Surrow,Enrico Tassi,T. Voss,D. Westphal,G. Wolf,U. Wollmer,C. Youngman,Aleksander Filip 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,Stephan Eisenhardt,P. Markun,T. Trefzger,S. Wölfle,J. T. Bromley,N. H. Brook,P. J. Bussey,Anthony Doyle,D. H. Saxon,L. E. Sinclair,E. Strickland,M. L. Utley,R. Waugh,A. S. Wilson,I. Bohnet,N. Gendner,U. Holm,A. Meyer-Larsen,H. Salehi,K. Wick,L. K. Gladilin,D. Horstmann,D. Kçira,Robert Klanner,E. Lohrmann,G. Poelz,W. Schott,F. Zetsche,T. C. Bacon,I. Butterworth,Joanne Cole,V. L. Harris,G. Howell,B. H. Y. Hung,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,Katsuo Tokushuku,S. Yamada,Yuji Yamazaki,S. H. An,S. B. Lee,S. W. Nam,H. S. Park,S. K. Park,Fernando Barreiro,J. P. Fernandez,G. García,R. Graciami,J. M. Hernandez,L. Hervás,L. Labarga,M. Martínez,J. Del Peso,J. Puga,J. Terrón,J. F. De Troconiz,Francois Corriveau,D. S. Hanna,L. W. Hung,J. N. Lim,W. N. Murray,A. Ochs,M. Riveline,D. G. Stairs,M. St. Laurent,R. Ullmann,T. Tsurugai,Vladimir Bashkirov,B. A. Dolgoshein,A. Stifutkin,G. L. Bashindzhagian,P. F. Ermolov,Yu. A. Golubkov,L. A. Khein,N. A. Korotkova,I. A. Korzhavina,V. A. Kuzmin,O. Yu. Lukina,A. S. Proskuryakov,Lydia Shcheglova,Anatoly Solomin,S. A. Zotkin,C. Bokel,M. Botje,N. Brümmer,F. Chlebana,J. Engelen,P. Kooijman,Adrianus Izaak Van Sighem,H. Tiecke,N. Tuning,W. Verkerke,J. Vossebeld,M. Vreeswijk,Leo Wiggers,E. De Wolf,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,Amanda Cooper-Sarkar,R. C. E. Devenish,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. Dal Corso,U. Dosselli,S. Limentani,M. Morandin,M. Posocco,L. Stanco,R. Stroili,C. Voci,J. Bulmahn,R. G. Feild,B. Y. Oh,J. R. Okrasinski,J. J. Whitmore,Y. Iga,G. D'agostini,G. Marini,A. Nigro,M. Raso,J. C. Hart,N. A. McCubbin,T. P. Shah,D. Epperson,C. Heusch,J. T. Rahn,Hartmut Sadrozinski,A. Seiden,D. C. Williams,O. Schwarzer,A. H. Walenta,H. Abramowicz,G. Briskin,S. Dagan,S. Kananov,A. Levy,T. Abe,T. Fusayasu,M. Inuzuka,K. Nagano,I. Suzuki,K. Umemori,T. Yamashita,R. Hamatsu,T. Hirose,K. Homma,S. Kitamura,T. Matsushita,K. Yamauchi,R. Cirio,M. Costa,M. I. Ferrero,S. Maselli,V. Monaco,C. Peroni,M. C. Petrucci,R. Sacchi,A. Solano,A. Staiano,M. Dardo,M. Brkic,C.-P. Fagerstroem,G. F. Hartner,K. K. Joo,G. M. Levman,J. F. Martin,R. S. Orr,S. Polenz,Cortney R. Sampson,D. Simmons,R. J. Teuscher,Jonathan Butterworth,C. D. Catterall,T. W. Jones,P. B. Kaziewicz,J. B. Lane,R. L. Saunders,J. Shulman,M. R. Sutton,B. Lu,L. W. Mo,J. Ciborowski,Grzegorz Grzelak,M. Kasprzak,K. Muchorowski,R. J. Nowak,J. M. Pawlak,R. Pawlak,T. Tymieniecka,A. K. Wroblewski,Janusz Andrzej Zakrzewski,M. Adamus,C. Coldewey,Y. Eisenberg,D. Hochman,U. Karshon,D. Revel,W. F. Badgett,D;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. Mattingly;F. Anselmo;P. Antonioli;G. Bari;M. Basile;L. Bellagamba;D. Boscherini;A. Bruni;G. Bruni;G. Cara Romeo;G. Castellini;L. Cifarelli;F. Cindolo;A. Contin;M. Corradi;Salvatore De Pasquale;I. Gialas;P. Giusti;G. Iacobucci;G. Laurenti;G. Levi;A. Margotti;T. Massam;R. Nania;F. Palmonari;A. Pesci;A. Polini;F. Ricci;G. Sartorelli;Y. Zamora Garcia;A. Zichichi;C. Amelung;A. Bornheim;I. Brock;K. Coböken;J. Crittenden;R. Deffner;M. Eckert;M. Grothe;H. Hartmann;K. Heinloth;L. Heinz;E. Hilger;H.-P. Jakob;Uli Katz;R. Kerger;E. Paul;M. Pfeiffer;Ch. Rembser;J. Stamm;R. Wedemeyer;H. Wieber;David C Bailey;S. Campbell-Robson;W. N. Cottingham;B. Foster;R. Hall-Wilton;M. E. Hayes;G. P. Heath;Helen Heath;D. Piccioni;D. G. Roff;R. J. Tapper;Michele Arneodo;R. Ayad;Marcella 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;Janusz Chwastowski;A. Eskreys;Z. Jakubowski;Mariusz Przybycien;M. Zachara;Leszek Zawiejski;Leszek Adamczyk;B. Bednarek;M. Bukowy;K. Jeleń;D. Kisielewska;T. Kowalski;E. Rulikowska-Zarȩbska;L. Suszycki;J. Zaja̧c;Z. Duliński;A. Kotański;Giovanni Abbiendi;L. A. T. Bauerdick;U. Behrens;H. Beier;J. K. Bienlein;G. Cases;O. Deppe;K. Desler;G. Drews;U. Fricke;D. J. Gilkinson;Claudia Glasman;P. Göttlicher;J. Grosse-Knetter;Tobias M. Haas;W. Hain;D. Hasell;K. F. Johnson;Matthias Kasemann;W. Koch;U. Kötz;J. Labs;L. Lindemann;B. Löhr;M. Löwe;O. Mańczak;J. Milewski;T. Monteiro;J. S. T. Ng;D. Notz;K. Ohrenberg;I. H. Park;A. Pellegrino;F. Pelucchi;K. Piotrzkowski;M. Roco;M. Rohde;J. Roldán;J. J. Ryan;A. A. Savin;U. Schneekloth;F. Selonke;B. Surrow;Enrico Tassi;T. Voss;D. Westphal;G. Wolf;U. Wollmer;C. Youngman;Aleksander Filip 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;Stephan Eisenhardt;P. Markun;T. Trefzger;S. Wölfle;J. T. Bromley;N. H. Brook;P. J. Bussey;Anthony Doyle;D. H. Saxon;L. E. Sinclair;E. Strickland;M. L. Utley;R. Waugh;A. S. Wilson;I. Bohnet;N. Gendner;U. Holm;A. Meyer-Larsen;H. Salehi;K. Wick;L. K. Gladilin;D. Horstmann;D. Kçira;Robert Klanner;E. Lohrmann;G. Poelz;W. Schott;F. Zetsche;T. C. Bacon;I. Butterworth;Joanne Cole;V. L. Harris;G. Howell;B. H. Y. Hung;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;Katsuo Tokushuku;S. Yamada;Yuji Yamazaki;S. H. An;S. B. Lee;S. W. Nam;H. S. Park;S. K. Park;Fernando Barreiro;J. P. Fernandez;G. García;R. Graciami;J. M. Hernandez;L. Hervás;L. Labarga;M. Martínez;J. Del Peso;J. Puga;J. Terrón;J. F. De Troconiz;Francois Corriveau;D. S. Hanna;L. W. Hung;J. N. Lim;W. N. Murray;A. Ochs;M. Riveline;D. G. Stairs;M. St. Laurent;R. Ullmann;T. Tsurugai;Vladimir Bashkirov;B. A. Dolgoshein;A. Stifutkin;G. L. Bashindzhagian;P. F. Ermolov;Yu. A. Golubkov;L. A. Khein;N. A. Korotkova;I. A. Korzhavina;V. A. Kuzmin;O. Yu. Lukina;A. S. Proskuryakov;Lydia Shcheglova;Anatoly Solomin;S. A. Zotkin;C. Bokel;M. Botje;N. Brümmer;F. Chlebana;J. Engelen;P. Kooijman;Adrianus Izaak Van Sighem;H. Tiecke;N. Tuning;W. Verkerke;J. Vossebeld;M. Vreeswijk;Leo Wiggers;E. De Wolf;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;Amanda Cooper-Sarkar;R. C. E. Devenish;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. Dal Corso;U. Dosselli;S. Limentani;M. Morandin;M. Posocco;L. Stanco;R. Stroili;C. Voci;J. Bulmahn;R. G. Feild;B. Y. Oh;J. R. Okrasinski;J. J. Whitmore;Y. Iga;G. D'agostini;G. Marini;A. Nigro;M. Raso;J. C. Hart;N. A. McCubbin;T. P. Shah;D. Epperson;C. Heusch;J. T. Rahn;Hartmut Sadrozinski;A. Seiden;D. C. Williams;O. Schwarzer;A. H. Walenta;H. Abramowicz;G. Briskin;S. Dagan;S. Kananov;A. Levy;T. Abe;T. Fusayasu;M. Inuzuka;K. Nagano;I. Suzuki;K. Umemori;T. Yamashita;R. Hamatsu;T. Hirose;K. Homma;S. Kitamura;T. Matsushita;K. Yamauchi;R. Cirio;M. Costa;M. I. Ferrero;S. Maselli;V. Monaco;C. Peroni;M. C. Petrucci;R. Sacchi;A. Solano;A. Staiano;M. Dardo;M. Brkic;C.-P. Fagerstroem;G. F. Hartner;K. K. Joo;G. M. Levman;J. F. Martin;R. S. Orr;S. Polenz;Cortney R. Sampson;D. Simmons;R. J. Teuscher;Jonathan Butterworth;C. D. Catterall;T. W. Jones;P. B. Kaziewicz;J. B. Lane;R. L. Saunders;J. Shulman;M. R. Sutton;B. Lu;L. W. Mo;J. Ciborowski;Grzegorz Grzelak;M. Kasprzak;K. Muchorowski;R. J. Nowak;J. M. Pawlak;R. Pawlak;T. Tymieniecka;A. K. Wroblewski;Janusz Andrzej Zakrzewski;M. Adamus;C. Coldewey;Y. Eisenberg;D. Hochman;U. Karshon;D. Revel;W. F. Badgett;D;
physics letters b 1997 Vol. 413 pp. 201-216
161
badgett,d1997physicsobservation

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 γp 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, xγ, shows a strong peak near unity, consistent with LO QCD Monte Carlo predictions. In the transverse energy and pseudorapidity range 5 ≤ ETγ < 10 GeV, −0.7 ≤ ηγ < 0.8, ETjet ≥ 5 GeV, and −1.5 ≤ ηjet ≤ 1.8, with xγOBS > 0.8, the measured cross section is 15.3 ± 3.8 ± 1.8 pb, in good agreement with a recent NLO calculation.

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