Production rates of bb quark pairs from gluons and bbbb events in hadronic Z 0 decays The OPAL Collaboration

Giovanni Abbiendi, K. Ackerstaff,C. Ainsley,P. F. Åkesson,Gideon Alexander,John Allison,Kelby Anderson,Silvia Arcelli,Shoji Asai, Steve Ashby, David Axen,Georges Azuelos, Ian Richard Bailey, Austin H. Ball, Elisabetta Luigia Barberio,Roger John Barlow,Scott M. Baumann,Ties Behnke, Ken W. Bell, Gideon Bella,Alain Bellerive,Stanislaus Cornelius Maria Bentvelsen,Siegfried Bethke,Otmar Biebel, Ian J Bloodworth, P. Bock,Jenny Böhme, Oana Elena Vickey Boeriu, Daniele Bonacorsi, Madjid Boutemeur,Sylvie Braibant, P. G. Bright-Thomas, Luca Brigliadori,Raymond M. Brown, Helfried Burckhart,Jochen Cammin, Paolo Capiluppi,Rebecca Carnegie,Antony Carter,Janet Carter, C. Y. Chang, David G. Charlton, Claudia Ciocca, P. E. L. Clarke,Edmund W. Clay, I. Cohen, Olivia Cooke, J. P. Couchman,C. Couyoumtzelis,R. L. Coxe,Marco Cuffiani,Shlomo Dado, G. M. Dallavalle, Steven Dallison,Albert De Roeck,Paul Dervan,Klaus Kurt Desch,Beatrix Dienes,Madhu Dixit, M M Donkers, Jörg Dubbert, Ehud Duchovni,Guenter Duckeck, I. P. Duerdoth, P. G. Estabrooks,Erez Etzion,Fabrizio Fabbri,Marcello Fanti, Lutz Werner Feld,Pablo A. Ferrari,Franz Fiedler, Ivor Fleck, M. Ford, A. Frey, A. Fuertjes, David Futyan,Pauline Gagnon, John William Gary, Goetz Gaycken, Christoph Geich-Gimbel, G. A. Giacomelli,Paolo Giacomelli, Douglas Andrew Glenzinski, Jason Goldberg,Claudio Grandi,Katie Leanne Graham,Eilam Gross, Jacob Grunhaus, Magali Gruwe, P. O. Guenther,Csaba Hajdu, Gail G. Hanson, Marc Hansroul, Maciej Hapke, K. Harder, Amnon Harel, C. K. Hargrove, M. Harin-Dirac, A. Hauke,Michael Hauschild,Christopher Hawkes, Richard John Hawkings, Richard J. Hemingway, Carsten Hensel, Gregor Herten, R. D. Heuer, Michael D. Hildreth, J. C. Hill, Andreas Hocker, Kara Dion Hoffman, Roger J. Homer, A. K. Honma,David P. Horvath, Khondker R Hossain, Ralph W. Howard, Petra Huentemeyer, Peter Igo-Kemenes, Kazumasa Ishii, Feba Ray Jacob, Abolhassan Jawahery, H. Jeremie, C. R. Jones, Predrag Jovanovi'c, T. R. Junk,Naoko Kanaya, Junichi Kanzaki, Gohar Karapetian,Douglas L. Karlen, Vakhtang Kartvelishvili, Kiyotomo Kawagoe,Tatsuo Kawamoto, Richard Keeler, R. G. Kellogg, B. W. Kennedy,Dong H. Kim,Katja Klein, Amit Klier,Takashi Kobayashi, Michael Kobel, Th. Kokott,Sachio Komamiya, Robert Victor Kowalewski, Thomas H. Kress, Peter Williamson Krieger, J. von Krogh, Thorsten Kuhl, Michael Kupper, Paul Kyberd, George Lafferty, Hagar Yael Landsman, Dankfried Lanske,Ian T. Lawson, J. G. Layter, Axel Leins, Daniel Lellouch, James Robert Letts, Lorne Levinson, R. Liebisch, J. Lillich,B. List, Chris Littlewood,Andrew W. Lloyd,Stephen Lloyd, F. K. Loebinger, George Long, Michael J Losty,Jianke Lu, Jean Ludwig, Anna Macchiolo, Amy Macpherson, Wolfgang Mader, Marcello Mannelli,Stefano Marcellini, T. E. Marchant, Andre Martin, J. P. Martin,G. Martinez, Tetsuro Mashimo, Peter Maettig, W.John McDonald,Ja Mckenna, Thomas J. Mcmahon, Robert McPherson,Frans Meijers, P. Mendez-Lorenzo, Frank S. Merritt, H. Mes, Aldo Michelini, S. Mihara, Giora Mikenberg,Danny Miller,Wolfgang Mohr,Alessandro Montanari,Tatsuya Mori, Kentaro Nagai, Ichizo Nakamura, Homer Neal, Richard Nisius,S. W. O'neale, F. G. Oakham, Fabrizio Odorici, Harold Ogren,Alexander Oh, A N Okpara, M. J. Oreglia, S. Orito,Gabriella Pásztor, Joleen R. Pater, G. N. Patrick, J. Patt, P. Pfeifenschneider, James Pilcher, James L. Pinfold,David Plane, Bonnie Poli, Jaroslaw Polok,Oliver Pooth, Mariusz Przybycien,Arnulf Quadt, Ch. Rembser, Hartmut Rick, S. A. Robins, Nathan Lee Rodning, J. Michael Roney,Stefano Rosati, Keith A. Roscoe, Antonio Maria Rossi,Yoram Rozen,Keith Runge, O. Runolfsson, David R. Rust, Kirsten Sachs, Takayuki Saeki,O. Sahr, E. K. G. Sarkisyan, Carla Sbarra, A. D. Schaile,O. Schaile, P. Scharff-Hansen, Stefan Schmitt, Matthias Schröder, Markus E. Schumacher,Christoph Schwick,William Scott, Rolf Seuster, T. G. Shears, Bao Chun Shen,Claire H. Shepherd-Themistocleous, Peter Sherwood,Gian Piero Siroli,Andris Skuja, Adrian M Smith, George A. Snow, Randall J. Sobie, S. Soeldner-Rembold,Stefania Spagnolo, M. Sproston, Achim Stahl,K. Stephens, K. Stoll, David M. Strom, Raimund Stroehmer, Bernd Surrow, S. D. Talbot,Shlomit Tarem, Richard James Taylor,Richard Teuscher, Michael Thiergen,Jeffrey P. Thomas,M. A. Thomson, Eric Torrence,Sherry Towers, Thomas Trefzger,Zoltan Laszlo Trocsanyi, E. Tsur, M. F. Turner-Watson, Ikuo Ueda, Philippe Vannerem,Marco Verzocchi, Heinrich Voss, Joost Vossebeld, David A. Waller,Colleen Ward, D. R. Ward, P. M. Watkins, A. Ted Watson, N. K. Watson, Peter S. Wells, Thorsten Wengler,Norbert Wermes, D. Wetterling, John Sampson White, Grant W. Wilson, J. A. Wilson, Terence R Wyatt,Shinji Yamashita, Viktor Zacek

semanticscholar（2000）

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摘要

The rates are measured per hadronic Z decay for gluon splitting to bb quark pairs, g bb , and of events containing two bb quark pairs, g4b, using a sample of four-jet events selected from data collected with the OPAL detector. Events with an enhanced signal of gluon splitting to bb quarks are selected if two of the jets are close in phase-space and contain detached secondary vertices. For the event sample containing two bb quark pairs, three of the four jets are required to have a significantly detached secondary vertex. Information from the event topology is combined in a likelihood fit to extract the values of g bb and g4b, namely g bb = (3.07 ± 0.53(stat) ± 0.97(syst)) × 10, g4b = (0.36 ± 0.17(stat) ± 0.27(syst)) × 10 . Submitted to Eur. Phys. J. C The OPAL Collaboration G. Abbiendi, K.Ackerstaff, C.Ainsley, P.F. Akesson, G.Alexander, J.Allison, K.J.Anderson, S.Arcelli, S.Asai, S.F.Ashby, D. Axen, G. Azuelos, I. Bailey, A.H. Ball, E. Barberio, R.J. Barlow, S. Baumann, T.Behnke, K.W. Bell, G.Bella, A. Bellerive, S. Bentvelsen, S. Bethke, O.Biebel, I.J. Bloodworth, P.Bock, J. Böhme, O.Boeriu, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R.M. Brown, H.J. Burckhart, J. Cammin, P. Capiluppi, R.K.Carnegie, A.A. Carter, J.R.Carter, C.Y. Chang, D.G. Charlton, C.Ciocca, P.E.L.Clarke, E.Clay, I. Cohen, O.C.Cooke, J. Couchman, C.Couyoumtzelis, R.L. Coxe, M. Cuffiani, S.Dado, G.M. Dallavalle , S.Dallison, A. de Roeck, P.Dervan, K.Desch, B. Dienes, M.S.Dixit, M. Donkers, J.Dubbert, E.Duchovni, G. Duckeck, I.P. Duerdoth, P.G. Estabrooks, E. Etzion, F. Fabbri, M. Fanti, L. Feld, P. Ferrari, F. Fiedler, I. Fleck, M.Ford, A. Frey, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, G. Gaycken, C.Geich-Gimbel, G. Giacomelli, P. Giacomelli, D. Glenzinski, J.Goldberg, C. Grandi, K.Graham, E.Gross, J.Grunhaus, M.Gruwé, P.O.Günther, C.Hajdu, G.G. Hanson, M. Hansroul, M. Hapke, K.Harder, A.Harel, C.K.Hargrove, M. Harin-Dirac, A.Hauke, M. Hauschild, C.M. Hawkes, R.Hawkings, R.J.Hemingway, C.Hensel, G. Herten, R.D. Heuer, M.D. Hildreth, J.C.Hill, A. Hocker, K.Hoffman, R.J.Homer, A.K. Honma, D. Horváth, K.R.Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, C.R. Jones, P. Jovanovic, T.R. Junk, N. Kanaya, J.Kanzaki, G.Karapetian, D. Karlen, V.Kartvelishvili, K.Kawagoe, T.Kawamoto, R.K.Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, K.Klein, A. Klier, T. Kobayashi, M. Kobel, T.P. Kokott, S.Komamiya, R.V. Kowalewski, T.Kress, P. Krieger, J. von Krogh, T.Kuhl, M. Kupper, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, I. Lawson, J.G. Layter, A. Leins, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, J. Lillich, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Lu, J. Ludwig, A.Macchiolo , A.Macpherson, W.Mader, M.Mannelli, S.Marcellini, T.E.Marchant, A.J. Martin, J.P. Martin, G. Martinez, T.Mashimo, P.Mättig, W.J. McDonald, J.McKenna, T.J.McMahon, R.A. McPherson, F. Meijers, P.Mendez-Lorenzo, F.S. Merritt, H.Mes, A.Michelini, S.Mihara, G. Mikenberg, D.J. Miller, W. Mohr, A. Montanari, T.Mori, K.Nagai, I. Nakamura, H.A. Neal , R. Nisius, S.W.O’Neale, F.G. Oakham, F. Odorici, H.O.Ogren, A. Oh, A.Okpara, M.J. Oreglia, S.Orito, G. Pásztor , J.R.Pater, G.N. Patrick, J. Patt, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, B. Poli, J. Polok, O.Pooth, M.Przybycień, A.Quadt, C.Rembser, H.Rick, S.A. Robins, N. Rodning, J.M. Roney, S.Rosati, K.Roscoe, A.M. Rossi, Y. Rozen, K.Runge, O.Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, P. Scharff-Hansen, S. Schmitt, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, M. Sproston, A. Stahl, K. Stephens, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S.D. Talbot, S. Tarem, R.J.Taylor, R.Teuscher, M. Thiergen, J. Thomas, M.A. Thomson, E. Torrence, S. Towers, T.Trefzger, I. Trigger, Z.Trócsányi, E.Tsur, M.F. Turner-Watson, I. Ueda, P.Vannerem, M. Verzocchi, H.Voss, J.Vossebeld, D. Waller, C.P.Ward, D.R. Ward, P.M. Watkins, A.T.Watson, N.K.Watson, P.S.Wells, T.Wengler, N.Wermes, D. Wetterling J.S.White, G.W. Wilson, J.A.Wilson, T.R.Wyatt, S.Yamashita, V. Zacek, D. Zer-Zion

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