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1. Search for heavy neutral Higgs bosons in two doublet models

Author

G. Leder, B. Åsman, Fernand Grard, V. Lefebure, D. Crennell, F. Mandl, Chiara Mariotti, S. Hahn, Francesca Romana Cavallo, P. Abreu, D. Gele, Ariella Cattai, F. Carena, V. V. Lapin, C. De Clercq, W. J. Murray, M. Verlato, G. Wormser, R. Henriques, H. Palka, M. Pernicka, Jesus Marco, G. Lenzen, R. Strub, F. Martinez-Vidal, V. Kostioukhine, M. Koratzinos, Mariusz Witek, J. W. Lamsa, M. Blume, F. Barao, M. Bonesini, Kathy Huet, Valeriy Pozdniakov, T. Bolognese, O. Yushchenko, G. D. Alekseev, E. Torassa, Rupert Leitner, G. Piana, F. Stichelbaut, Juan Abel Barrio, R. Mc Kay, A. Andreazza, A. Chan, W.S.C. Williams, Lucio Cerrito, R. Sekulin, W. Krupinski, G. Matthiae, G. Borisov, M. Baubillier, Achille Stocchi, L.N. Gerdyukov, A. Baroncelli, P. Van Dam, A. Klovning, M. J. Bates, Dietrich Liko, W. Bonivento, Kerem Cankocak, Y. Arnoud, U. Mjoernmark, C. Bosio, E. Higon, Sandra Amato, B. Golob, Toralf Bernhard Skaali, T. Spassov, D. Gamba, Lydia Roos, T. Buran, Markus Elsing, W. da Silya, H. T. Phillips, Vladimir Cindro, V. Chorowicz, M. L. Andrieux, S. Bosworth, F. Verbeure, H. J. Hilke, J. Drees, M. Mc Cubbin, M. S. Bilenky, L.J. Carroll, Louis Lyons, C. De La Vaissiere, K. Hultqvist, I. Lippi, Gueorgui Chelkov, D. Gillespie, Chariclia Petridou, J. H. Wickens, J. Medbo, B. Muryn, Marco Paganoni, Jose Luis Contreras, Fabio Cossutti, C. Vander Velde, Georgios Stavropoulos, Evangelos Gazis, Tiziano Camporesi, F. Richard, P. Chochula, C. Matteuzzi, P. Weilhammer, L. Bugge, M. Hahn, L. Vitale, L. S. Vertogradov, S. Almehed, R. Zuberi, D. Radojicic, Norbert Neumeister, T. Moa, G. Maehlum, A. Maio, F. Scuri, P. Lutz, F. Dupont, Imad Baptiste Laktineh, B. Stugu, M. Gandelman, R. Aleksan, G. Cosme, A. J. Camacho Rozas, R. Sosnowski, V.A. Uvarov, A. M. Zaitsev, Alexander Vodopyanov, Olga Botner, A. Tilquin, S. Squarcia, Mario Sannino, P. J. Holt, N. G. Redaelli, D. Z. Toet, P. Siegrist, Marco Bozzo, M. Dracos, L. Chaussard, R. Keranen, G. Transtromer, H. Saarikko, K. Kulka, P. Vincent, F. Naraghi, F. Bianchi, J. E. Augustin, Pawel Jalocha, Barry King, Branislav Sitar, P. Frenkiel, M. A. Lopez Aguera, E. Spiriti, Alexander Lincoln Read, Carmen García, I. Ripp, R. Janik, F. Waldner, Jan Krolikowski, N. N. Khovanski, W. Bartl, J. A. Valls Ferrer, J. Baudot, Francisco Matorras, O. Podobrin, D. Souza-Santos, H. Briand, C. Walck, J. L. Fousset, H. Foeth, Juan Fuster, A. M. Wetherell, J. N. Jackson, T. Tabarelli, S. Haider, D. Vilanova, R. Frühwirth, Jorge-Armando Benitez Garcia, A. Normand, J. Timmermans, J. P. Laugier, C. Caso, B. Ueberschaer, J. Rames, Andrea Perrotta, L. Lanceri, P. Kokkinias, Josef Strauss, P. Rebecchi, H. Rahmani, M. Reale, A. De Angelis, A. Lipniacka, Daniel Treille, M. Bigi, R. Orava, M. Pimenta, V. Chabaud, M. Espirito Santo, W. Venus, Ugo Gasparini, A. Lopez-Fernandez, P. Collins, Maurizio Canepa, H. B. Crawley, J. Chauveau, Klaus Hamacher, I. A. Tyapkin, Fares Djama, P. Niss, Stéphane Plaszczynski, B. A. Khomenko, P. Kubinec, Tuure Tuuva, R. Mc Nulty, C. K. Legan, D. Fassouliotis, L. Brillault, Daniel Bloch, J-C. Marin, R. Gokieli, K. A. Drees, P. Gunnarsson, V. Cassio, Francesco Navarria, Clara Troncon, H. De Boeck, B. Jean-Marie, M. Tyndel, R. Moeller, W. Kucewicz, R. A. Brenner, I. V. Ajinenko, F. M. L. Almeida, Guido Barbiellini, S. J. Alvsvaag, E. Agasi, Ahmimed Ouraou, G. W. Van Apeldoorn, R. Nicolaidou, Marc Winter, William Trischuk, A. Markou, M. Pegoraro, J. Maillard, C. Lambropoulos, Ugo Amaldi, P. H. Kramer, W. De Boer, J. Guy, Pierre Billoir, F. Ledroit, J. P. Engel, P. Langefeld, M. V. Castillo Gimenez, I. Kronkvist, J. Ridky, T. Maron, V. Nikolaenko, L. K. Resvanis, Tim Adye, A. N. Sisakian, Paul Dauncey, N. Demaria, G. Damgaard, K. D. Brand, J. Pennanen, N. I. Zimin, L. Gorn, B. Boštjančič, V. Perevozchikov, E. Zevgolatakos, O. Ullaland, Leif J. Jönsson, Spyros Tzamarias, O. Tchikilev, B. Bouquet, E. K. Johansson, H. Wahlen, L. Ventura, K. Yip, Mogens Dam, J.D. Richardson, Richard Jacobsson, G. E. Theodosiou, J. H. Koehne, Steinar Stapnes, Massimo Caccia, D. J. Holthuizen, Stefano Ragazzi, Andrei Nomerotski, F. Formenti, F. Cao, R. Lindner, Y. Lemoigne, Vaclav Vrba, V. Gracco, Pavlos Ioannou, B. Koene, A. Petrolini, Manfred Krammer, E. Karvelas, M. Mazzucato, J. T.M. Chrin, M. Michelotto, V. Ruhlmann-Kleider, M. Voutilainen, S. Marti i Garcia, Hans Dijkstra, D. Edsall, G. Grosdidier, P. Privitera, B. Franek, Goeran Jarlskog, P. Juillot, Klaus Moenig, Fabrizio Parodi, Paolo Ronchese, Y. Sacquin, V. Malychev, M. A. Houlden, T. J. V. Bowcock, K. H. Becks, S. C. Blyth, N. Ershaidat, G. Wilkinson, A. Ferrer, E. Vallazza, B. De Lotto, G. Crosetti, Evgueni Vlasov, M.D.M. De Fez Laso, J. Cuevas Maestro, G. Sciolla, Alessandra Romero, T. L. Hessing, C. Gaspar, V. Bocci, A. Tomaradze, M. Weierstall, N. J. Kjaer, C. Defoix, J. Dolbeau, F. Fulda-Quenzer, O. Kouznetsov, C. Kreuter, Z. Krumstein, P. Bambade, Borge Svane Nielsen, J. J. Lozano, A. Ruiz, S. De Brabandere, Krzysztof Doroba, Chiara Meroni, A. De Min, Wolfgang Adam, A. B. Fenyuk, G. C. Zucchelli, A. G. Olshevski, P.S.L. Booth, P. Zalewski, Gary John Barker, Martino Margoni, E. Graziani, A. G. Frodesen, M. A E Schyns, P. Bruckman, J. M. Brunet, E. Fokitis, E. I. Rosenberg, J. Bjarne, K. Stepaniak, Peter Kluit, J. M. Levy, W. Van Doninck, A. Trombini, H. Furstenau, Paolo Morettini, M. Feindt, S. Sánchez Navas, I. Siccama, G. Sajot, J. J. Gomez Y Cadenas, R. Pain, V. Lepeltier, S. Ueberschaer, Christine Kourkoumelis, Charles Bricman, P. F. Honore, B. Tome, P. Antilogus, E. Dahl-Jensen, Paolo Checchia, G. Tristram, H. Herr, L. G. Tkatchev, P. Negri, Ph. Gavillet, I. Stavitski, J. G. Loken, F. Hahn, O. Smirnova, M. Kaiser, K. Woschnagg, C. De Saint-Jean, P. Beilliere, A. Maltezos, R. Barate, A. Seitz, Paul Baillon, D. Zontar, M. Szeptycka, Z. Hajduk, G. E. Kalmus, D. Bertrand, Claire Bourdarios, P. Paganini, M. Berggren, J. P. Gerber, M. Battaglia, A. Sadovsky, B. Dalmagne, A. Firestone, Maciej Górski, G. Gopal, A. Buys, W. Neumann, W. D. Apel, Maria Roberta Monge, A. Zalewska, Y. Dufour, M. Davenport, L. De Paula, P. Carrilho, J. J. Hernandez, Milos Lokajicek, P. Pages, Maria Elena Pol, A. Hakansson, S. Katsanevas, Sandor Czellar, W. T. Meyer, S. O. Holmgren, W. Hao, P. B. Renton, O. Barring, Tiziano Rovelli, M. Zito, D. Y. Bardin, M. Karlsson, P. Delpierre, G. Polok, P. Poropat, L. Tortora, M. Prest, F. Zach, F. J. Harris, G. Myatt, T. A. Filippas, Luis Peralta, F. Kapusta, M. Regler, Allan Hallgren, Ernesto Migliore, Jacques Lemonne, W. Oberschulte-Beckmann, E. Cortina, P. V. Chliapnikov, Carlos Lacasta, A. Pullia, U. Haedinger, D. C. Fries, Stanislav Nemecek, R. Ehret, R. C. Shellard, L. Di Ciaccio, Josef Hrubec, B. Marechal, E. C. Katsoufis, A. M. Segar, W. Ruckstuhl, Yu. Sedykh, H. Mueller, G. Vegni, F. Fontanelli, J. Dahm, P. Beltran, Marta Calvi, Vincenzo Canale, Geoffrey Smith, Laurent Mirabito, Luc Pape, V. Falaleev, V. Obraztsov, T. Todorov, M. Wielers, I. Roncagliolo, A. Passeri, M. L. Turluer, D. Reid, Gianni Zumerle, Marek Szczekowski, Andromachi Tsirou, Andre Augustinus, A. Wehr, G. Smadja, J. Van Eldik, E. Rosso, H. Klein, Heinz Pernegger, T. S. Hill, K. Osterberg, A. Daum, M. Los, Tord Ekelof, H. Staeck, B. Loerstad, Phillip Allport, G. Della Ricca, Th. D. Papadopoulou, Robert S. Brown, Demetrios Loukas, G. Valenti, F. Pierre, Vincent Hedberg, D. W. Lane, Patrick Jarry, G. Rinaudo, J. Salt, J. A. Hernando, G. Ekspong, Cristian Stanescu, P. Branchini, P. N. Ratoff, H. Schneider, K. Kurvinen, D. Wicke, S. Simonetti, Javier Sánchez, Ivan Mikulec, C. Martinez-Rivero, M. Begalli, P. Herquet, R. Contri, Manolis Dris, P. Roudeau, Alberto Benvenuti, R. Lauhakangas, Ph. Charpentier, M. Donszelmann, Danilo Zavrtanik, F. Simonetto, UCL - SST/IRMP - Institut de recherche en mathématique et physique, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), DELPHI, Delphi, Collaboration, Abreu, P., Adam, W., Canale, Vincenzo, Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), BARBIELLINI AMIDEI, Guido, Cossutti, F., DELLA RICCA, Giuseppe, Lanceri, Livio, Poropat, Paolo, and Vitale, Lorenzo

Subjects
Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Jet (particle physics), 01 natural sciences, Standard Model, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Engineering (miscellaneous), DELPHI, Boson, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, LARGE ELECTRON POSITRON COLLIDER, b-tagging, Pair production, PARTICLE PHYSICS, Higgs boson, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

A search for pair production of neutral heavy Higgs bosons decaying into bb has been carried out in a study of hadronic decays of the Z boson into four jet final states using data taken by DELPHI in 1991 and 1992. The two production mechanisms present in the two Higgs doublets scheme, bremsstrahlung production of hZ* and associated production of hA, may lead to four beauty jets well recognizable using the precise microvertex detector measurements. No evidence for a signal was found, leading to limits on BR(ZrarrhArarr4b) from 3.5 to 5.5×10–4 at 95% contidence level, depending on the mass of the ligthest Higgs. When combined with the results of the recent DELPHI standard Higgs search, this result allows the kinematical limit to be reached for the masses of h and A in the minimal supersymmetric extension of the Standard Model (MSSM) scheme. It also allows the tanbetale1 domain to be explored, and a region above the kinematic limit for direct hA production is constrained by considering virtual hA production. Results are also given in the general two-doublet scheme.

Published
1995

2. Measurement of the Partial Width of the Z0 Into B(b)over-bar Final-states Using Their Semileptonic Decays

Author

Tord Ekelof, H. Staeck, E. Lieb, M. Jonker, H. Palka, G. Skjevling, R. Lauhakangas, Ph. Charpentier, B. Loerstad, D. Fassouliotis, J. W. Lamsa, Ariella Cattai, F. Ledroit, A. B. Fenyuk, O.M. Kouznetsov, M. Los, F. Barao, H. Burmeister, I. Lippi, Tiziano Rovelli, V. Lepeltier, Paolo Checchia, Ph. Gavillet, T. A. Fearnley, E.N. Tsyganov, J. H. Wickens, M. Sessa, Marco Paganoni, Jose Luis Contreras, M. Karlsson, O. Ullaland, Leif J. Jönsson, A. Klovning, Robert S. Brown, C. Ronnqvist, A. De Min, Joao Varela, I. Siccama, H. Foeth, U. Mjoernmark, C. Bosio, G. Sajot, E. Higon, R. Seufert, J. J. Gomez Y Cadenas, A. P. Ostankov, S. Bosworth, U. Trevisan, T.E. Pettersen, Pierre Juillot, B. Koene, F. Scuri, M. Donszelmann, R. J. Apsimon, H. Briand, T. L. Hessing, C. Vander Velde, B. Franek, K. Woschnagg, Matteo Pegoraro, A. M. Wetherell, A. Chan, W.S.C. Williams, Lucio Cerrito, Claire Bourdarios, J. Dolbeau, Andrea Perrotta, G. Sette, A. Elliot Peisert, A. G. Frodesen, A. G. Olshevski, L. Lanceri, Jan Ridky, G. Gopal, Luc Pape, Z. Hajduk, V. Chorowicz, L. Vitale, F. Carena, S. Volponi, Maciej Górski, V. Ruhlmann, A. Hakansson, P. Grosse-Wiesmann, A. De Angelis, P. Collins, D. Delikaris, M. Turala, L. Chaussard, P. V. Chliapnikov, Paolo Morettini, J. G. Loken, Andrey Korytov, R. Sosnowski, P. Bambade, P.S.L. Booth, A. Maltezos, S. O. Holmgren, L. S. Vertogradov, P. Niss, T. S. Spassoff, M. Mazzucato, P. Szymanski, G. Vegni, N. Brummer, K. Kulka, F. Naraghi, V. G. Timofeev, P. Lutz, Patrick Jarry, G. Rinaudo, J. Salt, G. A. Chelkov, R. Zukanovich Funchal, C. Lambropoulos, Ugo Amaldi, L. Bugge, P. Abreu, Daniel Bloch, Ahmimed Ouraou, V.M. Golovatyuk, R. Mc Nulty, A. Firestone, D. Johnson, G. Hamel de Monchenault, P. Beilliere, Charles Bricman, Josef Strauss, S. Braibant, V. Chabaud, O. Toker, Jan Krolikowski, N. N. Khovanski, W. Bartl, L. Mathis, M. Michelotto, A. J. Camacho Rozas, Eilam Gross, F. Simonetto, M. J. Bates, G. Leder, W. De Boer, B. Åsman, E. Zevgolatakos, Juan Abel Barrio, D. Z. Toet, Maria Roberta Monge, A. Zalewska, Itzhak Roditi, D. Crennell, F. Mandl, V.A. Uvarov, M. P. Clara, G. W. Van Apeldoorn, W. T. Meyer, W. Venus, C. J. Beeston, G. Smadja, I. Kronkvist, J. A. Valls Ferrer, J. P. Laugier, Ugo Gasparini, Jacques Lemonne, P. E. S. Nilsen, G. Sciolla, L. O. Eek, R. C. Shellard, H. Wahlen, Ariel Goobar, J. H. Koehne, Rupert Leitner, M. Voutilainen, G. Grosdidier, M. Vollmer, U. Rossi, Paolo Giacomelli, S. Delorme, M. Zito, M. Kopf, H. De Boeck, B. Jean-Marie, M. Tyndel, J. Maillard, L. Di Ciaccio, Josef Hrubec, A. M. Segar, Guido Barbiellini, J. Guy, M. Crozon, Jon Christopher Wikne, Alessandra Romero, A. Ruiz, J. Kesteman, C. Defoix, M. A E Schyns, F. Fulda-Quenzer, L. Ventura, Y. Lemoigne, J. N. Jackson, P. Kokkinias, P. S. Iversen, F. Fontanelli, W. Van Doninck, Tim Adye, R. Pain, D. Isenhower, P. Herquet, M. L. Turluer, D. Reid, S. Squarcia, K. H. Becks, E. Vallazza, B. Boštjančič, E. I. Rosenberg, J. Chauveau, R. Holmes, K. Kurvinen, Borge Svane Nielsen, J. J. Lozano, B. Grossetete, Allan Hallgren, Giovanni Valenti, W. Hao, O. Barring, M. Weierstall, M. S. Bilenky, P. N. Bogolubov, Krzysztof Doroba, E. Graziani, Chiara Meroni, Jan Buytaert, J. E. Augustin, J. Drees, J. M. Brunet, P. F. Honore, U. Haedinger, R. Contri, G. D. Alekseev, E. Torassa, H. Saarikko, L.J. Carroll, Toralf Bernhard Skaali, D. Gamba, G. Voulgaris, F. Verbeure, F. Kapusta, S. Marti, Javier Sánchez, Ivan Mikulec, Christine Kourkoumelis, D. Benedic, A. Baroncelli, E. Dahl-Jensen, Peter Kluit, S. Dagoret, V. Perevozchikov, Tiziano Camporesi, Jorge-Armando Benitez Garcia, M. Pernicka, I. Hietanen, Mario Sannino, Manolis Dris, S. Haider, A. Lopez-Fernandez, Klaus Hamacher, P. Borgeaud, U. Kruener-Marquis, P. H. Kramer, Richard Brenner, Paolo Ronchese, P. Van Dam, A. Passeri, Pierre Billoir, Gianni Zumerle, G. Cosme, M. Mc Cubbin, K. Hultqvist, P. Roudeau, N. G. Redaelli, F. Stichelbaut, C. Caso, R. Mc Kay, Jesus Marco, G. Lenzen, V. Kostioukhine, K. A. J. Forbes, S. D. Hodgson, A. Andreazza, D. Radijicic, C. De La Vaissiere, N. J. Kjaer, B. A. Della Riccia, B. Golob, Georgios Stavropoulos, D. Zavrtanik, Tuure Tuuva, S. Gumenyuk, Marco Bozzo, B. Dalmagne, T. Buran, Laurent Chevalier, G. Zhang, Themistocles Bowcock, A. Tilquin, P. Weilhammer, Evangelos Gazis, M. Fernandez Alonso, E. Lillethun, Clara Troncon, D. J. Holthuizen, P. Siegrist, S. J. Alvsvaag, E. Agasi, J-C. Marin, R. Gokieli, S. Ueberschaer, Peter M. Allen, M. Pimenta, B. A. Khomenko, N. De Groot, Francesco Navarria, P. Vaz, J. Zúñiga, Pawel Jalocha, Barry King, E. Spiriti, Dietrich Liko, V. Obraztsov, P. Privitera, P. Frenkiel, A. Grant, P. Poropat, Andromachi Tsirou, C. O. Higgins, Jürgen H. Werner, D. Vilanova, Stefano Ragazzi, R. Zuberi, R. Keranen, R. Frühwirth, J. Timmermans, Milos Lokajicek, Hans Dijkstra, Juan Fuster, A. Pullia, Olga Botner, K. Furnival, T. Todorov, J. Straver, F. Waldner, I. Roncagliolo, P. Zalewski, Francisco Matorras, N. Yamdagni, F. Cao, Spyros Tzamarias, O. Tchikilev, Krzysztof Korcyl, A. Lipniacka, T. Maron, H. B. Crawley, R. Lindner, M. T. Trainor, Andre Augustinus, A. Wehr, G. Tristram, Paula Eerola, M. A. Lopez Aguera, Carmen García, A. Koch-Mehrin, C. Walck, Daniel Treille, J. P. Gerber, H. P. Borner, Stefan Schael, Wolfgang Adam, Th. D. Papadopoulou, Guenakh Mitselmakher, R. Barate, G. Galeazzi, F. Couchot, A. Ferrer, V. Bocci, R. Orava, Fernand Grard, L. Tortora, Mogens Dam, D. Bertrand, A. Daum, M. Dracos, S. Rossi, W. Da Silva, G. E. Kalmus, H. Furstenau, M. Davenport, J. Bjarne, G. Crossetti, F. J. Harris, W. A. Mitaroff, J. Lindgren, Natale Demaria, G. Meola, Martino Margoni, B. Nijjhar, Stefaan Tavernier, P. Antilogus, J. Krstic, K. D. Brand, J. Pennanen, E. Fokitis, Yu. Belokopytov, F. Richard, J. E. Hooper, C. Matteuzzi, Carlos Lacasta, M. Hahn, B. Bouquet, Maria Elena Pol, S. Almehed, M. Berggren, W. Klempt, N. I. Zimin, Krzysztof A. Rybicki, D. Wormald, F. Hahn, J. M. Levy, M. Feindt, P. Negri, S. Katsanevas, D. Y. Bardin, E. K. Johansson, B. Muryn, George Kalkanis, P. B. Renton, Cristian Stanescu, P. Branchini, Francesca Romana Cavallo, T. Hofmokl, Marek Szczekowski, H. Schneider, E. Cortina, Mitchell Wayne, M. De Beer, E. G. Anassontzis, J. P. Engel, T. A. Filippas, Göran Jarlskog, M. Regler, M. V. Castillo Gimenez, W. Ruckstuhl, D. C. Fries, Steinar Stapnes, V. V. Lapin, M. Bonesini, W. D. Apel, P. Yepes, R. Ehret, G. Damgaard, E. Rosso, H. Klein, Y. Sacquin, O. Pingot, C. De Clercq, E. C. Katsoufis, W. J. Murray, V. Gracco, P. Beltran, Pavlos Ioannou, K. Osterberg, Marta Calvi, Vincenzo Canale, Geoffrey Smith, R. Strub, H. Mueller, Klaus Moenig, M. A. Houlden, M. Richardson, W. Bonivento, V. Vrba, G. Borisov, M. Baubillier, Achille Stocchi, I. A. Tyapkin, A. M. Zaitsev, Alexander Vodopyanov, F. Bianchi, E. Karvelas, J. Cuevas Maestro, R. Moeller, Roberto Cirio, L. K. Resvanis, Massimo Caccia, Vladimir Nikolaenko, J. J. Hernandez, P. O. Hulth, P. Delpierre, E. Daubie, G. Myatt, A. N. Sisakian, J. T.M. Chrin, C. Matthiae, Edoardo Castelli, F. Pierre, G. Ekspong, Giovanni Darbo, P. N. Ratoff, S. Simonetti, M. Begalli, Louis Lyons, R. Sekulin, G. E. Theodosiou, S. C. Blyth, Demetrios Loukas, G. Wilkinson, T. Moa, G. Maehlum, M.D.M. De Fez Laso, Fares Djama, William Trischuk, A. Markou, M. A. Winter, A. Petrolini, T. Henkes, B. De Lotto, Evgueni Vlasov, Paul Baillon, Alexander Lincoln Read, M. Szeptycka, H. Herr, L. G. Tkatchev, Pieter David, W. Krupinski, H. J. Hilke, M. Battaglia, T. Bolognese, Y. Dufour, P. D. Dauncey, Sandor Czellar, G. Polok, T. Tabarelli, C. Gaspar, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DELPHI, Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), and UCL - SST/IRMP - Institut de recherche en mathématique et physique

Subjects
Quark, Physics, Particle physics, Muon, Partial width, HEAVY FLAVOR PRODUCTION, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Branching fraction, LUND MONTE-CARLO, Electron–positron annihilation, Hadron, High Energy Physics::Phenomenology, 01 natural sciences, Spectral line, Sphericity, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

The spectra of prompt electrons and muons from the semi-leptonic decays of heavy hadrons produced inZ 0 decays have been used to measure the coupling of theZ 0 tob quarks weighted by theB hadrons mean semi-leptonic branching fraction, giving a value: $$BR_{sl}^b *{{\Gamma _{b\bar b} } \mathord{\left/ {\vphantom {{\Gamma _{b\bar b} } {\Gamma _H }}} \right. \kern-\nulldelimiterspace} {\Gamma _H }} = 0.0221 \pm 0.0015$$ . The data has also been used to measure the value of the fragmentation parameter, defined in the context of the LUND PS Model, version 7.2, giving: $$\varepsilon (b) = \left( {8\begin{array}{*{20}c} { + 5} \\ { - 3} \\ \end{array} \pm 2} \right)10^{ - 3} $$ . The corresponding value of the mean fraction of the beam energy taken by aB hadron in the fragmentation of ab quark is: $$\overline {X_E^b } = 0.69\begin{array}{*{20}c} { + 0.02} \\ { - 0.03} \\ \end{array} \pm 0.01$$ . If the values of $$\Gamma _{b\bar b} $$ andΓ H are taken from the Standard Model, the following value is obtained for the mean semi-leptonic braching fraction ofB hadrons: BR sl =(10.1±0.7)%. Taking the value of $${{\Gamma _{b\bar b} } \mathord{\left/ {\vphantom {{\Gamma _{b\bar b} } {\Gamma _{\rm H} }}} \right. \kern-\nulldelimiterspace} {\Gamma _{\rm H} }}$$ from an independent analysis of DELPHI data based on the use of the boosted sphericity product, a value: BR sl =(10.1±1.3)% is obtained.

Published
1992

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