Measurement of the charm and beauty structure functions using the H1 vertex detector at HERA

F D Aaron,J Cvach,D Haidt,T H Tran,I Tsakov,K Müller,L Lytkin,L Schoeffel,F Zomer,M Klein,P R Newman,A Valkárová,J V Morris,K Krüger,S Schmitt,D Wegener,J Gayler,T Zimmermann,S Vinokurova,J Katzy,A Dubak,D Traynor,M Hildebrandt,S Habib,A Falkiewicz,G Nowak,R Kogler,H Meyer,V Boudry,A Specka,G Eckerlin,E Elsen,B Tseepeldorj,K Begzsuren,M Gouzevitch,A W Jung,A Knutsson,B R Grell,L Marti,A Raspiareza,M U Mozer,B Stella,J A Coughlan,A Zhokin,A Makankine,D Šálek,A Glazov,R C W Henderson,C Niebuhr,H Jung,J Delvax,T Kluge,A Schöning,D Pitzl,C Kleinwort,K Daum,W Lange,G D Patel,A Eliseev,D P C Sankey,R Zus,G Thompson,V Dodonov,A J Rahmat,E Barrelet,G Stoicea,V Chekelian,J Turnau,S Shushkevich,C Pascaud,M Jacquet,M Kraemer,A Dossanov,E Sauvan,S Mikocki,A Cholewa,J Feltesse,M Rotaru,G Grindhammer,V Brisson,A Fedotov,A Asmone,C Vallée,M Sauter,N Gogitidze,V Radescu,C Diaconu,I Glushkov,B Roland,V Efremenko,S J Maxfield,P Kostka,V Andreev,T N Trinh,K Lipka,B Pokorny,A Mehta,F Moreau,Y De Boer,X Janssen,S Levonian,A Fomenko,G Laštovička-Medin,A Vargas Trevino,C Alexa,B Olivier,D Sunar,D Hoffmann,V Tchoulakov,A Nikiforov,J Meyer,F Tomasz,T Toll,A Liptaj,E Rizvi,S Ghazaryan,K H Hiller,E Hennekemper,N Loktionova,U Straumann,H Henschel,V Spaskov,J Kretzschmar,V Palichik,P Van Mechelen,C Wissing,P Sopicki,A Rostovtsev,V Lubimov,A Belousov,P Marage,A Kropivnitskaya,A Petrukhin,D Bruncko,I Panagoulias,T Naumann,G Li,J E Olsson,B Delcourt,S Osman,C Kiesling,L Bystritskaya,A Baghdasaryan,G Brandt,C Grab,O Pejchal,E Wünsch,R Horisberger,A J Campbell,A Morozov,H Zohrabyan,E A De Wolf,G Herrera,P Reimer,A Lebedev,R Polifka,E Malinovski,Z Rurikova,G Buschhorn,S Egli,P D Thompson,K Alimujiang,R Plačakytė,L N Shtarkov,T Greenshaw,F Sefkow,T Ravdandorj,B List,G Cozzika,P Truöl,M Mudrinic,W Bartel,V Lendermann,K Krastev,D South,V Volchinski,Z Staykova,P Laycock,R Roosen,I R Kenyon,Y Soloviev,J G Contreras,J B Dainton,M Kapichine,M P J Landon,K Nowak,L Favart,M Del Degan,G Leibenguth,J Ferencei,T Sloan,A Bunyatyan,J Žáček,D Ozerov,M Steder,F Cassol-Brunner,R Felst,I Milcewicz-Mika,L Goerlich,C Helebrant,K Urban,T Preda,L Jönsson,M Herbst,T Hreus,M Fleischer,P Robmann,E Gabathuler,Y Vazdik,I Smiljanić ,J Braciník ,S Backović ,M Pandurović ,Th D Papadopoulou ,Volker Michels ,Krzysztof Kutak ,J Zálešâk ,S M Piec ,K Černý ,M Nožička ,Andreas Bernhard Meyer ,I Božović-Jelisavc̆ić ,D Fischer ,M Aldaya Martin ,T Sýkora ,Martin Brinkmann ,M.e Janssen ,J.c Bizot ,N Raičević ,V Černý ,B Antunović ,K B Cantun Avila ,H U Martyn ,I Pićurić ,J E Ruiz Tabasco ,H.‐C Schultz‐Coulon ,Bogdan Povh ,R López-Fernández ,П Мурін ,S V Rusakov ,Zhiqing Philippe Zhang ,M Von Den Driesch ,E Pérez ,Jenny List ,R.n Shaw-West ,Michal Deák

doi:10.1140/epjc/s10052-009-1190-0

Abstract

Inclusive charm and beauty cross sections are measured in e-p and e+p neutral current collisions at HERA in the kinematic region of photon virtuality 5<Q^2<2000 GeV^2 and Bjorken scaling variable 0.0002<x<0.05. The data were collected with the H1 detector in the years 2006 and 2007 corresponding to an integrated luminosity of 189 pb^-1. The numbers of charm and beauty events are determined using variables reconstructed by the H1 vertex detector including the impact parameter of tracks to the primary vertex and the position of the secondary vertex. The measurements are combined with previous data and compared to QCD predictions.

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