Measurement of open beauty production at HERA

C. Adloff, V. Andreev, B. Andrieu, V. Arkadov, A. Astvatsatourov, I. Ayyaz, A. Babaev, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, U. Bassler, P. Bate, A. Beglarian, O. Behnke, C. Beier, A. Belousov, T. Benisch, C. Berger, G. BernardiT. Berndt, G. Bertrand-Coremans, P. Biddulph, J. C. Bizot, V. Boudry, W. Braunschweig, V. Brisson, H. B. Broker, D. P. Brown, W. Brückner, P. Bruel, D. Bruncko, J. Bürger, F. W. Busser, A. Bunyatyan, S. Burke, A. Burrage, G. Buschhorn, D. Calvet, A. J. Campbell, J. Cao, T. Carli, E. Chabert, M. Charlet, D. Clarke, B. Clerbaux, C. Collard, J. G. Contreras, J. A. Coughlan, M. C. Cousinou, B. E. Cox, G. Cozzika, J. Cvach, J. B. Dainton, W. D. Dau, K. Daum, M. David, M. Davidsson, B. Delcourt, R. Demirchyan, A. de Roeck, E. A. de Wolf, C. Diaconu, P. Dixon, V. Dodonov, K. T. Donovan, J. D. Dowell, A. Droutskoi, C. Duprel, J. Ebert, G. Eckerlin, D. Eckstein, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, E. Elsen, M. Erdmann, A. B. Fahr, P. J W Faulkner, L. Favart, A. Fedotov, R. Felst, J. Feltesse, J. Ferencei, F. Ferrarotto, S. Ferron, M. Fleischer, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, J. M. Foster, G. Franke, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, S. Ghazaryan, A. Glazov, L. Goerlich, N. Gogitidze, M. Goldberg, I. Gorelov, C. Grab, H. Grässler, T. Greenshaw, R. K. Griffiths, G. Grindhammer, T. Hadig, D. Haidt, L. Hajduk, V. Haustein, W. J. Haynes, B. Heinemann, G. Heinzelmann, R. C W Henderson, S. Hengstmann, H. Henschel, R. Heremans, G. Herrera, I. Herynek, M. Hilgers, K. H. Hiller, C. D. Hilton, J. Hladky, P. Höting, D. Hoffmann, R. Horisberger, S. Hurling, M. Ibbotson, M. Jacquet, M. Jaffre, L. Janauschek, D. M. Jansen, X. Janssen, L. Jönsson, D. P. Johnson, A. Zhokin, M. Jones, H. Jung, H. K. Kästli, D. Kant, M. Kapichine, M. Karlsson, O. Karschnick, O. Kaufmann, M. Kausch, F. Keil, N. Keller, I. R. Kenyon, S. Kermiche, C. Kiesling, M. Klein, C. Kleinwort, G. Knies, H. Kolanoski, S. D. Kolya, V. Korbel, P. Kostka, S. K. Kotelnikov, M. W. Krasny, H. Krehbiel, J. Kroseberg, D. Krücker, K. Krüger, A. Küpper, T. Kuhr, T. Kurca, W. Lachnit, R. Lahmann, D. Lamb, M. P J Landon, W. Lange, U. Langenegger, A. Lebedev, F. Lehner, V. Lemaitre, R. Lemrani, V. Lendermann, S. Levonian, M. Lindstroem, V. Lubimov, G. Lobo, E. Lobodzinska, S. Lüders, D. Luke, L. Lytkin, N. Magnussen, H. Mahlke-Krüger, N. Malden, E. Malinovski, I. Malinovski, R. Maraček, P. Marage, J. Marks, R. Marshall, H. U. Martyn, J. Martyniak, S. J. Maxfield, T. R. McMahon, A. Mehta, K. Meier, P. Merkel, F. Metlica, A. Meyer, H. Meyer, J. Meyer, P. O. Meyer, S. Mikocki, D. Milstead, R. Mohr, S. Mohrdieck, M. N. Mondragon, F. Moreau, A. Morozov, J. V. Morris, D. Muller, K. Muller, P. Murín, V. Nagovizin, B. Naroska, J. Naumann, T. Naumann, I. Negri, P. R. Newman, H. K. Nguyen, T. C. Nicholls, F. Niebergall, C. Niebuhr, O. Nix, G. Nowak, T. Nunnemann, J. E. Olsson, A. Usik, D. Ozerov, P. Palmen, V. Panassik, C. Pascaud, S. Passaggio, G. D. Patel, H. Pawletta, E. Perez, J. P. Phillips, D. Pitzl, R. Pöschl, I. Potashnikova, B. Povh, K. Rabbertz, G. Rädel, J. Rauschenberger, P. Reimer, B. Reisert, D. Reyna, S. Riess, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, C. Royon, S. Rusakov, K. Rybicki, D. P C Sankey, J. Scheins, F. P. Schilling, S. Schleif, P. Schleper, D. Schmidt, L. Schoeffel, T. Schörner, V. Schroder, H. C. Schultz-Coulon, F. Sefkow, V. Shekelyan, I. Sheviakov, L. N. Shtarkov, G. Siegmon, Y. Sirois, T. Sloan, P. Smirnov, M. Smith, V. Solochenko, Y. Soloviev, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, J. Steinhart, B. Stella, A. Stellberger, J. Stiewe, U. Straumann, W. Struczinski, J. P. Sutton, M. Swart, M. Taševský, V. Tchernyshov, S. Tchetchelnitski, G. Thompson, P. D. Thompson, N. Tobien, R. Todenhagen, D. Traynor, P. Truöl, G. Tsipolitis, J. Turnau, J. Turney, E. Tzamariudaki, S. Udluft, S. Valkár, A. Valkárová, C. Vallée, A. van Haecke, P. van Mechelen, Y. Vazdik, G. Villet, S. von Dombrowski, K. Wacker, R. Wallny, T. Walter, B. Waugh, G. Weber, M. Weber, D. Wegener, A. Wegner, T. Wengler, M. Werner, L. R. West, G. White, S. Wiesand, T. Wilksen, M. Winde, G. G. Winter, C. Wissing, M. Wobisch, H. Wollatz, E. Wünsch, J. Žáček, J. Zálešák, Z. Zhang, P. Zini, F. Zomer, J. Zsembery, M. zur Nedden

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The first observation of open b production in ep collisions is reported. An event sample containing muons and jets has been selected which is enriched in semileptonic b quark decays. The visible cross section σ(ep → bb̄X → μX′) for Q2 <1 GeV2, 0.1 <y <0.8 is measured to be 0.176 ± 0.016(stat.)-0.017+0.026 (syst.)nb for the muons to be detected in the range 35° <θμ <130° and p⊥μ > 2.0 GeV in the laboratory frame. The expected visible cross section based on a NLO QCD calculation is 0.104 ± 0.017 nb. The cross sections for electroproduction with Q2 <1 GeV2 and photoproduction are derived from the data and found to be σ(ep → ebb̄X) = 7.1 ± 0.6(stat.)-1.3+1.5(syst.) nb and σ(γp → bb̄X) = 111 ± 10(stat.)-20+23 (syst.)nb at an average 〈Wγp〉 ∼ 180 GeV, respectively. © 1999 Published by Elsevier Science B.V. All rights reserved.

    Keywords

    • High Energy Physics - Experiment

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