Observation of isolated high-ET photons in deep inelastic scattering

S CHEKANOV,S Grijpink, E Koffeman,P Kooijman,E Maddox,A Pellegrino,S Schagen,H Tiecke,L W Wiggers,Wolf E De,M Derrick,J H Loizides,S Magill,S Miglioranzi,B Musgrave,J Repond,R Yoshida,M C K Mattingly,N Pavel, P Antonioli,G Bari,M Basile, L Bellagamba, D Boscherini, A Bruni,G Bruni,G Cara Romeo, L Cifarelli, F Cindolo,A Contin, M Corradi,S De Pasquale, P Giusti,G Iacobucci, A Margotti,A Montanari, R Nania, F Palmonari,A Pesci,Lorenzo Rinaldi,G Sartorelli, A Zichichi, G Aghuzumtsyan,D Bartsch, I Brock,S Goers,H Hartmann,E Hilger,P Irrgang,H P Jakob,O Kind,Ulrich Meyer,E Paul,J Rautenberg,R Renner,A Stifutkin,J Tandler,K C Voss,Min Wang,D S Bailey,N H Brook,J E Cole,Greg P Heath,T Namsoo,S A Robins,M Wing,M Capua,A Mastroberardino, M Schioppa,G Susinno,J Y Kim,I T Lim,K J Ma,M Y Pac,M Helbich,Y Ning,Z Ren,W B Schmidke,F Sciulli,J Chwastowski,A Eskreys,Jan Figiel,A Galas,K Olkiewicz,P Stopa,L Zawiejski,L Adamczyk, T Bold, I Grabowskabold, D Kisielewska,A M Kowal,M Kowal,J łukasik,M Przybycien,L Suszycki,D Szuba,J Szuba,A Kotanski,W Slominski,Volker Adler, U Behrens, I Bloch, K Borras,Vincenzo Chiochia,D Dannheim,G Drews,J Fourletova,U Fricke, A Geiser,P Gottlicher,O Gutsche,T Haas,W Hain, S Hillert,Claus Horn,B Kahle,U Kotz,H Kowalski, G Kramberger,H Labes, D Lelas,H Lim,B Lohr, R Mankel, I A Melzerpellmann,C N Nguyen,D Notz,A E Nuncioquiroz,A Polini,Amita Raval,L Rurua,U Schneekloth, U Stosslein,G Wolf,C Youngman, W Zeuner,S Schlenstedt, G Barbagli, E Gallo,C Genta,P G Pelfer,A Bamberger,A Benen,F Karstens, D Dobur,N N Vlasov,M A Bell, P Bussey,A T Doyle,James Ferrando,J Hamilton,S Hanlon,D H Saxon,I O Skillicorn,I Gialas, T Carli,T Gosau,U Holm, N Krumnack,E Lohrmann,M Milite,H Salehi, P Schleper,T Schornersadenius, S Stonjek,K Wichmann,K Wick,Ar Ziegler, C Collinstooth, C Foudas,Ricardo Goncalo,K R Long,Alexander Tapper,P Cloth,D Filges,Mayuko Kataoka,K Nagano,K Tokushuku, S Yamada,Y Yamazaki,A N Barakbaev,E Boos,N S Pokrovskiy,B O Zhautykov,D Son,Krzysztof Piotrzkowski,F Barreiro,C Glasman,O Gonzalez, L Labarga,J Del Peso,E Tassi,J Terron,M Zambrana,M Barbi,F Corriveau,S Gliga,J Lainesse,S Padhi,D G Stairs,R Walsh,T Tsurugai,Alexey Antonov,P Danilov, B A Dolgoshein,D Gladkov,V Sosnovtsev,S Suchkov,R K Dementiev,P Ermolov, I Katkov,L A Khein,I A Korzhavina,V A Kuzmin,B B Levchenko,O Yu Lukina,A S Proskuryakov,L M Shcheglova,S A Zotkin,I Abt, C Buttner,A Caldwell,X Liu,J Sutiak,N Coppola, M Vazques,N Brummer, B Bylsma, L S Durkin, T Y Ling,A M Coopersarkar,A Cottrell,R C E Devenish,B Foster,G Grzelak,C Gwenlan,T Kohno, S K Patel,P B Straub, R Walczak,A Bertolin,R Brugnera,R Carlin,F Dal Corso,S Dusini,A Garfagnini,S Limentani,A Longhin,A Parenti,M Posocco,L Stanco,M Turcato, E A Heaphy,F Metlica,B Y Oh,J Whitmore,Y Iga,G Dagostini,G Marini,A Nigro,C M Cormack,J C Hart,N A Mccubbin,C A Heusch,I H Park,H Abramowicz,A M Gabareen,S Kananov,A Kreisel,A Levy, M Kuze,T Fusayasu,Shunsuke Kagawa,T Tawara,Toru Yamashita,R Hamatsu,T Hirose,M Inuzuka,H Kaji,S Kitamura,K Matsuzawa,M Costa,M I Ferrero, Vincenzo Monaco, R Sacchi, A Solano,M Arneodo, M Ruspa,T Koop,J F Martin,A Mirea,J M Butterworth,R Hallwilton,T W Jones,M S Lightwood,M R Sutton,C Targettadams,J Ciborowski,R Ciesielski,P łuzniak,R J Nowak,J M Pawlak,J Sztuk,T Tymieniecka,A Ukleja,J Ukleja,A F żarnecki,M Adamus,Pawel Plucinski,Y Eisenberg,D Hochman,U Karshon,M Riveline,A Everett, L K Gladilin,D Kcira,S Lammers, Lili Li,D D Reeder,M Rosin, P M Ryan, A Savin,W H Smith,S Dhawan,S Bhadra,C D Catterall,S Fourletov,G F Hartner,S Menary,Mara Senghi Soares,J Standage

PHYSICS LETTERS B（2004）

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摘要

First measurements of cross sections for isolated prompt photon production in deep inelastic ep scattering have been made using the ZEUS detector at the HERA electron-proton collider using an integrated luminosity of 121 pb(-1). A signal for isolated photons in the transverse energy and rapidity ranges 5 < E-T(y) < 10 GeV and -0.7 < eta(gamma) < 0.9 was observed for virtualities of T the exchanged photon of Q(2) > 35 GeV2. Cross sections are presented for inclusive prompt photons and for those accompanied by a single jet in the range E-jet(T) greater than or equal to 6 GeV and 1.5 less than or equal to eta(jet) < 1.8. Calculations at order alpha(3)alpha(s), describe the data reasonably well. (C) 2004 Elsevier B.V. All rights reserved.

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