1. A MEASUREMENT OF D-MESON PRODUCTION IN Z(0) HADRONIC DECAYS
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F. Carena, M. Szczekowski, V.A. Uvarov, T. Todorov, A. Chan, W.S.C. Williams, G. Hamel de Monchenault, M. L. Turluer, A. Passeri, Lucio Cerrito, Josef Strauss, S. Braibant, G. Stavropoulos, V. Chabaud, R. Lauhakangas, Ph. Charpentier, W. Venus, D. Reid, Guido Barbiellini, V. Chorowicz, J. Guy, W. De Silva, M. Sessa, J. N. Jackson, M. Pernicka, I. Hietanen, Patrick Jarry, G. Rinaudo, D. Benedic, Tim Adye, R. Nicolaidou, I. Kronkvist, J. Salt, Gianni Zumerle, P. Niss, Jesus Marco, R. Strub, P. Vaz, R. Sekulin, P. Kokkinias, T. S. Spassoff, M. Donszelmann, Danilo Zavrtanik, V. Kostioukhine, M. Koratzinos, J. H. Köhne, L. S. Vertogradov, P. Poropat, Louis Lyons, R. Aleksan, B. Dalmagne, Laurent Chevalier, M. Lokajicek, D. Trielle, M. Mazzucato, Heinz Pernegger, L. Tortora, F. J. Harris, P. Szymanski, J. E. Hooper, Carlos Lacasta, G. E. Theodosiou, Andromachi Tsirou, H. P. Borner, Stefan Schael, A. Daum, F. Stichelbaut, R. Mc Kay, J. J. Hernandez, A. N. Sisakian, Andre Augustinus, A. Wehr, E. K. Johansson, D. Darbo, Steinar Stapnes, E. I. Rosenberg, K. Kulka, P. Vincent, V. G. Timofeev, P. Herquet, R. Contri, L. O. Eek, R. C. Shellard, L. Di Ciaccio, Josef Hrubec, A. M. Segar, K. A. J. Forbes, S. D. Hodgson, B. Golob, T. Buran, Itzhak Roditi, L. Mathis, G. W. Van Apeldoorn, M. Voutilainen, D. Edsall, G. Grosdidier, M. Crozon, P. Abreu, Alessandra Romero, A. Ruiz, J. Kesteman, M. A E Schyns, P. F. Honore, G. Vegni, N. Brummer, G. D. Alekseev, E. Torassa, S. C. Blyth, G. Wilkinson, M.D.M. De Fez Laso, D. Johnson, K. Kurvinen, Javier Sánchez, Ivan Mikulec, Dietrich Liko, P. Privitera, Chariclia Petridou, A. Andreazza, D. Bertrand, O. Podobrin, Manolis Dris, P. S. Iversen, Demetrios Loukas, L. Ventura, R. Lindner, Y. Lemoigne, U. Gasparini, A. Baroncelli, J. T.M. Chrin, M. Mc Cubbin, K. Hultqvist, R. Zuberi, M. Michelotto, William Trischuk, A. De Min, I. Siccama, P. Roudeau, M. Weierstall, G. Smadja, P. N. Bogolubov, G. Sajot, H. Briand, S-O. Holmgren, J. J. Gomez Y Cadenas, Tord Ekelof, H. Staeck, Olga Botner, Krzysztof Korcyl, Alberto Benvenuti, E. Dahl-Jensen, Juan Abel Barrio, P. Van Dam, E. Cortina, G. Valenti, A. G. Frodesen, C. Kourkoumelis, A. Petrolini, T. Henkes, B. De Lotto, G. Crosetti, Evgueni Vlasov, Natale Demaria, J. Ridky, R. Pain, H. Palka, G. Skjevling, Klaus Hamacher, Carmen García, W. Ruckstuhl, D. Vilanova, G. Meola, J-C. Marin, R. Keranen, Francisco Matorras, N. Yamdagni, J. Lindgren, R. Gokieli, P. H. Kramer, S. Ueberschaer, D. Souza-Santos, Pierre Billoir, A. Markou, W. A. Mitaroff, C. J. Beeston, C. De La Vaissiere, Z. Hajduk, P. Rebecchi, Th. D. Papadopoulou, P. Beltran, Stefano Ragazzi, George Kalkanis, H. Herr, L. G. Tkatchev, B. Loerstad, Guenakh Mitselmakher, S. Rossi, F. Pierre, Maciej Górski, J. W. Lamsa, P. B. Renton, J. M. Levy, M. Feindt, Themistocles Bowcock, A. Tilquin, Spyros Tzamarias, O. Tchikilev, O. Smirnova, D. C. Fries, A. Maltezos, M. Davenport, A. Hakansson, S. J. Alvsvaag, E. Agasi, Pawel Jalocha, Barry King, F. Cao, Rupert Leitner, Vincent Hedberg, S. Squarcia, R. Holmes, H. Saarikko, F. Barao, A. Seitz, P. Negri, M. Richardson, E. Spiriti, H. Burmeister, G. Maehlum, E. C. Katsoufis, G. Ekspong, W. Kucewicz, F. Richard, R. Frühwirth, J. Timmermans, Cristian Stanescu, P. Branchini, Marta Calvi, G. Borisov, Vincenzo Canale, Geoffrey Smith, C. Matteuzzi, A. Lipniacka, M. Hahn, G. Matthiae, F. Fulda-Quenzer, T. Tabarelli, Göran Jarlskog, M. Baubillier, Achille Stocchi, A. G. Olshevski, L. Chaussard, Yu. Belokopyptov, M. Chapkin, A. Grant, N. Ershaidat, A. Ferrer, V. Bocci, Robert S. Brown, H. Schneider, Tiziano Rovelli, P. V. Chliapnikov, E. Lieb, P. N. Ratoff, G. Lenzen, S. Simonetti, A. M. Zaitsev, Alexander Vodopyanov, E. Graziani, J. M. Brunet, A. Lopez-Fernandez, F. Bianchi, A. Koch-Mehrin, R. Zukanovich Funchal, Marc Winter, B. Grossetete, O. Toker, C. Troncon, H. Wahlen, M. Begalli, H. Rahmani, H. Foeth, W. D. Apel, A. Miao, D. Fassouliotis, Ariella Cattai, F. Ledroit, Paul Baillon, R. J. Apsimon, Alexander Lincoln Read, M. Szeptycka, S. Marti, B. Koene, Martino Margoni, E. Fokitis, Mogens Dam, Matteo Pegoraro, T. L. Hessing, C. Ronnqvist, G. Zhang, A. P. Ostankov, E. Higon, R. Seufert, Hans Dijkstra, C. Gaspar, R. Moeller, M. Karlsson, O. Ullaland, Leif J. Jönsson, E. Karvelas, P. Grosse-Wiesmann, A. De Angelis, S. Francon, P. Collins, Paolo Morettini, J. G. Loken, S. Bosworth, J. Werner, Maria Roberta Monge, Tuure Tuuva, Luc Pape, Andrei Nomerotski, U. Trevisan, L. K. Resvanis, V. Ruhlmann-Kleider, P. Beilliere, K. H. Becks, J. Cuevas Maestro, C. De Clerq, E. Vallazza, Daniel Bloch, D. J. Holthuizen, A. Zalewska, P. Zalewski, F. Scuri, Ahmimed Ouraou, V.M. Golovatyuk, B. Franek, M. Verlato, G. Wormser, R. Rosnowski, M. Jonker, Massimo Caccia, W. T. Meyer, A. B. Fenyuk, S. Plaszcznski, W. Hao, O. Barring, K. Furnival, Y. Sacquin, A. M. Wetherell, Vladimir Nikolaenko, L. Lanceri, Jacques Lemonne, J. E. Augustin, F. Couchot, J. Bjarne, Wolfgang Adam, Laurent Mirabito, A. Firestone, O.M. Kouznetsov, P. Juillot, V. Lepeltier, Jorge-Armando Benitez Garcia, Paolo Checchia, Ph. Gavillet, T. Moa, A. Klovning, B. Tome, P. Antilogus, Y. Arnoud, U. Mjoernmark, C. Bosio, H. J. Hilke, F. Hahn, K. D. Brand, J. Pennanen, N. I. Zimin, Claire Bourdarios, L. Vitale, A. Algeri, Flavio Fontanelli, P. O. Hulth, S. Haider, M. Vollmer, Paolo Giacomelli, L. Bugge, P. Delpierre, A. J. Camacho Rozas, E. Daubie, M. Zito, D. Z. Toet, P. Siegrist, M. Battaglia, G. Myatt, H. B. Crawley, Allan Hallgren, Andrea Perrotta, G. Sette, P. Davies, U. Haedinger, J. P. Engel, M. van der Heijden, A. Elliot Peisert, Y. Dufour, P. D. Dauncey, U. Kruener-Marquis, Sandor Czellar, M. V. Castillo Gimenez, Paolo Ronchese, G. Damgaard, R. Mc Nulty, N. J. Kjaer, Robin Campion, O. Pingot, H. De Boeck, B. Jean-Marie, M. Tyndel, G. Polok, J. Maillard, V. Gracco, P. Yepes, G. Tristram, Paula Eerola, F. Dupont, Andrey Korytov, B. Boštjančič, R. Barate, G. E. Kalmus, Klaus Moenig, Fabrizio Parodi, M. A. Houlden, Francesca Romana Cavallo, Mitchell Wayne, V. V. Lapin, Gary John Barker, K. Woschnagg, W. J. Murray, F. Simonetto, Tiziano Camporesi, G. Gopal, G. Cosme, Jan Krolikowski, N. G. Redaelli, Marco Bozzo, P. Frenkiel, P. Ioannou, J. Straver, F. Waldner, C. Walck, J. L. Fousset, N. N. Khovanski, W. Bartl, G. Leder, M. J. Bates, D. Gamba, M. Witek, J. A. Valls Ferrer, F. Verbeure, B. Åsman, J. P. Laugier, B. Stugu, Juan Fuster, Luis Peralta, F. Kapusta, A. Pullia, H. Furstenau, D. Crennell, F. Mandl, Eugene P. Gross, T. Hofmokl, Peter M. Allen, M. Pimenta, E. Rosso, H. Klein, K. Osterberg, M. Los, B. A. Khomenko, N. De Groot, Francesco Navarria, C. Defoix, J. Zúñiga, T. Maron, I. Lippi, E.N. Tsyganov, J. H. Wickens, Marco Paganoni, Jose Luis Contreras, Borge Svane Nielsen, J. J. Lozano, Krzysztof Doroba, Chiara Meroni, Jan Buytaert, Peter Kluit, D. Radojicic, P. Lutz, M. S. Bilenky, L.J. Carroll, P. Weilhammer, T. Lesiak, Maria Elena Pol, S. Katsanevas, D. Y. Bardin, T. A. Filippas, M. Regler, R. Ehret, H. Mueller, J. Dolbeau, P. Bambade, P.S.L. Booth, Charles Bricman, C. O. Higgins, Mario Sannino, M. A. Lopez Aguera, J. P. Gerber, R. Orava, Fernand Grard, B. Bouquet, B. Nijjhar, M. Berggren, C. Vander Velde, G. A. Chelkov, C. Lambropoulos, Ugo Amaldi, W. De Boer, E. Zevgolatakos, P. E. S. Nilsen, G. Sciolla, W. Van Doninck, Richard Brenner, M. Fernandez Alonso, V. Obraztsov, I. Roncagliolo, J. Drees, Evangelos Gazis, M. Dracos, M. Bonesini, Kathy Huet, Valeriy Pozdniakov, T. Bolognese, W. Bonivento, V. Vrba, J. Chauveau, I. A. Tyapkin, A. Almehed, I. V. Ajinenko, 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), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), 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), 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), DELPHI, UCL - SC/PHYS - Département de physique, 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 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), and 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)
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CHARMED MESONS ,Quark ,Particle physics ,E+E ANNIHILATION ,Physics and Astronomy (miscellaneous) ,Meson ,LUND MONTE-CARLO ,Electron–positron annihilation ,Hadron ,01 natural sciences ,JET FRAGMENTATION ,Charm quark ,PHYSICS ,Nuclear physics ,0103 physical sciences ,D meson ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Nuclear Experiment ,RESONANCE ,010306 general physics ,Engineering (miscellaneous) ,Physics ,Partial width ,010308 nuclear & particles physics ,High Energy Physics::Phenomenology ,Mass spectrum ,High Energy Physics::Experiment ,Particle Physics - Experiment - Abstract
A study of the fragmentation properties of charm and bottom quarks intoD mesons is presented. From 263 700Z 0 hadronic decays collected in 1991 with the DELPHI detector at the LEP collider,D 0,D + andD *+ are reconstructed in the modesK − π +,K − π + K + andD 0 π + followed byD 0→K − π +, respectively. The fractional decay widths $$\Gamma {{(Z^0 \to {D \mathord{\left/ {\vphantom {D {\bar D}}} \right. \kern-\nulldelimiterspace} {\bar D}}X)} \mathord{\left/ {\vphantom {{(Z^0 \to {D \mathord{\left/ {\vphantom {D {\bar D}}} \right. \kern-\nulldelimiterspace} {\bar D}}X)} {\Gamma _h }}} \right. \kern-\nulldelimiterspace} {\Gamma _h }}$$ are determined, and first results are presented for the production ofD mesons from $$c\bar c$$ and $$b\bar b$$ events separately. The average energy fraction ofD *± in charm quark fragmentation is found to be 〈X E (D *)〉 c =0.487±0.015 (stat)±0.005 (sys.). Assuming that the fraction ofD s and charm-baryons produced at LEP is similar to that around 10 GeV, theZ 0 partial width into charm quark pairs is determined to beΓ c /Γ h =0.187±0.031 (stat)±0.023 (sys). The probability for ab quark to fragment into $$\bar B_s $$ orb-baryons is inferred to be 0.268±0.094 (stat)±0.100 (sys) from the measured probability that it fragments into a $$\bar B^0 $$ orB −.