Measurement of charm and beauty photoproduction at HERA using [formula omitted] correlations

A Aktas,A Dubak,W Erdmann,J Turnau,G Cozzika,C Wigmore,K Lipka,V Chekelian,V Andreev,B Vujicic,S Egli,E Lobodzinska,J Naumann,L Finke,E Gabathuler,D Bruncko,S Ghazaryan,H Meyer,Z Rurikova,V Palichik,I Milcewicz-Mika,F Cassol-Brunner,A Glazov,E Tzamariudaki,I Tsurin,R Demirchyan,G Nowak,G Weber,G Flucke,S Ginzburgskaya,O Henshaw,V Jemanov,T Frisson,D.P Johnson,D Lüke,P Smirnov,M Gregori,A Knutsson,S Xella,A Nikiforov,J Bähr,F Moreau,N Loktionova,D Meer,D Hoffmann,C Goyon,X Janssen,G Tsipolitis,W.D Dau,M Ibbotson,R Weber,A Schöning,B Roland,R Marshall,A.-I Lucaci-Timoce,L Lindfeld,P Robmann,B Naroska,Y.H Fleming,N Malden,S Essenov,P Laycock,A Fomenko,M Beckingham,S Schmidt,G Franke,A De Roeck,C Kleinwort,A Lebedev,I Sheviakov,K Nankov,E Malinovski,A Rimmer,L Goerlich,P Truöl,P Marage,A Rostovtsev,A Zhelezov,L Lytkin,S Mangano,B Leißner,T Laštovička,A Asmone,C Schmitz,L Janauschek,K Daum,P Kostka,Y Sirois,J Meyer,A Usik,S Schmitt,S Levonian,A Mehta,F Sefkow,B List,H Henschel,D Pitzl,L Bystritskaya,A Makankine,T Klimkovich,S Baumgartner,N Werner,A Valkárová,N Van Remortel,K Krastev,V Efremenko,V Brisson,E Garutti,V Spaskov,G Grindhammer,S Schätzel,N Keller,E Barrelet,V Lendermann,L Hajduk,C Werner,R Eichler,S Gorbounov,J Cvach,W Bartel,F.W Büsser,F Zomer,A Mohamed,F Salvaire,O Behnke,M Klein,P Reimer,J Haller,E Wünsch,J Formánek,A Petrukhin,C Diaconu,D Utkin,A Astvatsatourov,C Vallée,I Tsakov,J Wagner,G Buschhorn,V Volchinski,R Felst,C Kiesling,O Behrendt,A Falkewicz,V Korbel,A Baghdasaryan,R Koutouev,Y Vazdik,A Specka,S Aplin,A Zhokin,K Meier,C Gerlich,P Van Mechelen,V Yeganov,K Krüger,J Stiewe,F Eisele,A Vest,T Anthonis,G Thompson,L Jönsson,F Tomasz,D South,M Hildebrandt,R Oganezov,R Roosen,E Elsen,M Peez,B Olivier,K Desch,J Ferencei,M Ellerbrock,A Bunyatyan,Ch Berger,C Veelken,V Schröder,C Pascaud,B Portheault,G Knies,R Horisberger,C Niebuhr,E Sauvan,R Wolf,N Gogitidze,D Ozerov,P Prideaux,J Becker,M Goettlich,S Osman,M Wessels,G Eckerlin,D Haidt,C Grab,I Strauch,V Lubimov,J Gayler,H Lueders,S Vinokurova,A Morozov,S Baudrand,Z Zhang,D Milstead,I Foresti,T Lux,T Sloan,P Fleischmann,M Jacquet,M.-O Boenig,W Lange,B Stella,B Delcourt,H Zohrabyan,T Kluge,V Boudry,L Schoeffel,M Urban,D Nikitin,Y Soloviev,A Fedotov,G Heinzelmann,A Hovhannisyan,V Dodonov,A Belousov,E Rizvi,G Herrera,I Glushkov,R Gerhards,J Kretzschmar,J Žáček,B Wessling,A Babaev,J.C Bizot,J Kückens,H Jung,D Traynor,C Schwanenberger,A Vargas Trevino,G Frising,T Greenshaw,U Straumann,R Plačakytė,N Berger,K Müller,P Baranov,S Caron,S Mikocki,A Perieanu,J Katzy,K Wacker,M Kapichine,V Tchoulakov,G Brandt,M Fleischer,A Kropivnitskaya,D Wegener,L Favart,C Risler,M U Mozer ,J V Morris ,K H Hiller ,R López-Fernández ,M Nožička ,P R Newman ,Bogdan Povh ,S Backović ,S V Rusakov ,Mohamed Ismaïl ,D Brown ,Š Valkár ,A Campbell ,M Martišíková ,J B Dainton ,G G Winter ,I R Kenyon ,Jens Zimmermann ,Th D Papadopoulou ,K C̆erný ,L N Shtarkov ,W G Yan ,Peter Faulkner ,П Мурін ,R C W Henderson ,H.‐C Schultz‐Coulon ,J A Coughlan ,D P C Sankey ,E A De Wolf ,G D Patel ,J G Contreras ,T Naumann ,J Zálešâk ,V Černý ,Kamil Sedlák ,C Wissing ,H U Martyn ,S J Maxfield ,M P J Landon ,Magnus Hansson ,B Cox ,N Raičević ,D Pérez-Astudillo ,E Pérez ,J E Olsson ,Martin Karlsson ,J Braciník ,Peter Thompson ,F P Schilling ,C B Gwilliam ,A Meyer

doi:10.1016/j.physletb.2005.06.040

Abstract

A measurement of charm and beauty photoproduction at the electron proton collider HERA is presented based on the simultaneous detection of a D*± meson and a muon. The correlation between the D* meson and the muon serves to separate the charm and beauty contributions and the analysis provides comparable sensitivity to both. The total and differential experimental cross sections are compared to LO and NLO QCD calculations. The measured charm cross section is in good agreement with QCD predictions including higher order effects while the beauty cross section is higher.

Highlights

CollaborationPhysikalisches Institut der RWTH, Aachen, Germany 7 b III
At the electron proton collider HERA, heavy quarks are predominantly produced via photon–gluon fusion, γ g → ccor bb, where the photon is emitted from the incoming lepton and the gluon from the proton
The measurements, which are based on an integrated luminosity of L = 89 pb−1, are compared to leading order (LO) and next-to-leading order (NLO) perturbative QCD calculations