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Measurement of $F_2^{c\bar{c}}$ and $F_2^{b\bar{b}}$ at Low $Q^2$ and x using the H1 Vertex Detector at HERA

A. Aktas V. Andreev T. Anthonis S. Aplin A. Asmone A. Astvatsatourov A. Babaev S. Backovic J. Bahr A. Baghdasaryan P. Baranov E. Barrelet 1 W. Bartel S. Baudrand 2 S. Baumgartner J. Becker M. Beckingham O. Behnke O. Behrendt A. Belousov Ch. Berger N. Berger J.C. Bizot 2 M.-O. Boenig V. Boudry 3 J. Bracinik G. Brandt V. Brisson 2 D.P. Brown D. Bruncko F.W. Busser A. Bunyatyan G. Buschhorn L. Bystritskaya A.J. Campbell S. Caron F. Cassol-Brunner 4 K. Cerny V. Cerny V. Chekelian J.G. Contreras J.A. Coughlan B.E. Cox G. Cozzika J. Cvach J.B. Dainton W.D. Dau K. Daum Y. de Boer B. Delcourt 2 A. de Roeck K. Desch E.A. de Wolf C. Diaconu 4 V. Dodonov A. Dubak G. Eckerlin V. Efremenko S. Egli R. Eichler F. Eisele M. Ellerbrock W. Erdmann S. Essenov A. Falkewicz P.J.W. Faulkner L. Favart A. Fedotov R. Felst J. Ferencei L. Finke M. Fleischer P. Fleischmann Y.H. Fleming G. Flucke A. Fomenko I. Foresti G. Franke T. Frisson 3 E. Gabathuler E. Garutti J. Gayler C. Gerlich S. Ghazaryan S. Ginzburgskaya A. Glazov I. Glushkov L. Goerlich M. Goettlich N. Gogitidze S. Gorbounov C. Goyon 4 C. Grab T. Greenshaw M. Gregori B.R. Grell G. Grindhammer C. Gwilliam D. Haidt L. Hajduk M. Hansson G. Heinzelmann R.C.W. Henderson H. Henschel O. Henshaw G. Herrera M. Hildebrandt K.H. Hiller D. Hoffmann 4 R. Horisberger A. Hovhannisyan T. Hreus S. Hussain M. Ibbotson M. Ismail M. Jacquet 2 L. Janauschek X. Janssen V. Jemanov L. Jonsson D.P. Johnson A.W. Jung H. Jung M. Kapichine J. Katzy N. Keller I.R. Kenyon C. Kiesling M. Klein C. Kleinwort T. Klimkovich T. Kluge G. Knies A. Knutsson V. Korbel P. Kostka K. Krastev J. Kretzschmar A. Kropivnitskaya K. Kruger J. Kuckens M.P.J. Landon W. Lange T. Lastovicka G. Lastovicka-Medin P. Laycock A. Lebedev G. Leibenguth V. Lendermann S. Levonian L. Lindfeld K. Lipka A. Liptaj B. List E. Lobodzinska N. Loktionova R. Lopez-Fernandez V. Lubimov A.-I. Lucaci-Timoce H. Lueders D. Luke T. Lux L. Lytkin A. Makankine N. Malden E. Malinovski S. Mangano P. Marage R. Marshall M. Martisikova H.-U. Martyn S.J. Maxfield D. Meer A. Mehta K. Meier A.B. Meyer H. Meyer J. Meyer S. Mikocki I. Milcewicz-Mika D. Milstead D. Mladenov A. Mohamed F. Moreau 3 A. Morozov J.V. Morris M.U. Mozer K. Muller P. Murin K. Nankov B. Naroska T. Naumann P.R. Newman C. Niebuhr A. Nikiforov D. Nikitin G. Nowak M. Nozicka R. Oganezov B. Olivier J.E. Olsson S. Osman D. Ozerov V. Palichik I. Panagoulias T. Papadopoulou C. Pascaud 2 G.D. Patel M. Peez 3 E. Perez D. Perez-Astudillo A. Perieanu A. Petrukhin D. Pitzl R. Placakyte B. Portheault 2 B. Povh P. Prideaux N. Raicevic P. Reimer A. Rimmer C. Risler E. Rizvi P. Robmann B. Roland R. Roosen A. Rostovtsev Z. Rurikova S. Rusakov F. Salvaire D.P.C. Sankey E. Sauvan 4 S. Sch¨atzel F.-P. Schilling S. Schmidt S. Schmitt C. Schmitz L. Schoeffel A. Schoning H.-C. Schultz-Coulon K. Sedlak F. Sefkow R.N. Shaw-West I. Sheviakov L.N. Shtarkov T. Sloan P. Smirnov Y. Soloviev D. South V. Spaskov A. Specka 3 B. Stella J. Stiewe I. Strauch U. Straumann V. Tchoulakov G. Thompson P.D. Thompson F. Tomasz D. Traynor P. Truol I. Tsakov G. Tsipolitis I. Tsurin J. Turnau E. Tzamariudaki Martin Urban A. Usik D. Utkin S. Valkar A. Valkarova C. Vallee 4 P. van Mechelen A. Vargas Trevino Y. Vazdik C. Veelken A. Vest S. Vinokurova V. Volchinski B. Vujicic K. Wacker J. Wagner G. Weber R. Weber D. Wegener C. Werner N. Werner M. Wessels B. Wessling C. Wigmore C. Wissing R. Wolf E. Wunsch S. Xella W. Yan V. Yeganov J. Zacek J. Zalesak Zhiqing Zhang 2 A. Zhelezov A. Zhokin Y.C. Zhu J. Zimmermann T. Zimmermann H. Zohrabyan F. Zomer 2
Abstract : Measurements are presented of inclusive charm and beauty cross sections in e^+p collisions at HERA for values of photon virtuality 12 \le Q^2 \le 60 GeV^2 and of the Bjorken scaling variable 0.0002 \le x \le 0.005. The fractions of events containing charm and beauty quarks are determined using a method based on the impact parameter, in the transverse plane, of tracks to the primary vertex, as measured by the H1 vertex detector. Values for the structure functions F_2^{c\bar{c}} and F_2^{b\bar{b}} are obtained. This is the first measurement of F_2^{b\bar{b}} in this kinematic range. The results are found to be compatible with the predictions of perturbative quantum chromodynamics and withprevious measurements of F_2^{c\bar{c}}.
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Submitted on : Wednesday, February 8, 2006 - 5:49:59 PM
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A. Aktas, V. Andreev, T. Anthonis, S. Aplin, A. Asmone, et al.. Measurement of $F_2^{c\bar{c}}$ and $F_2^{b\bar{b}}$ at Low $Q^2$ and x using the H1 Vertex Detector at HERA. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2006, 45, pp.23-33. ⟨10.1140/epjc/s2005-02415-6⟩. ⟨in2p3-00025593⟩

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