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Inclusive $\Sigma^-$ and $\Lambda(1520)$ production in hadronic Z decays

By P. Abreu, W. Adam, T. Adye, P. Adzic, I. Ajinenko, Z. Albrecht, T. Alderweireld, G D. Alekseev, R. Alemany, T. Allmendinger, P P. Allport, S. Almehed, U. Amaldi, N. Amapane, S. Amato, E G. Anassontzis, P. Andersson, A. Andreazza, S. Andringa, P. Antilogus, W D. Apel, Y. Arnoud, B. Asman, J.-E. Augustin, A. Augustinus, P. Baillon, A. Ballestrero, P. Bambade, F. Barao, Guido Barbiellini, R. Barbier, D Yu. Bardin, G. Barker, A. Baroncelli, M. Battaglia, M. Baubillier, K H. Becks, M. Begalli, A. Behrmann, P. Beilliere, Yu. Belokopytov, N C. Benekos, A C. Benvenuti, C. Berat, M. Berggren, D. Bertrand, M. Besancon, M. Bigi, M S. Bilenkii, M A. Bizouard, D. Bloch, H M. Blom, M. Bonesini, M. Boonekamp, P S L. Booth, G. Borisov, C. Bosio, O. Botner, E. Boudinov, B. Bouquet, C. Bourdarios, T J V. Bowcock, I. Boyko, I. Bozovic, M. Bozzo, M. Bracko, P. Branchini, R A. Brenner, P. Bruckman, J M. Brunet, L. Bugge, T. Buran, B. Buschbeck, P. Buschmann, S. Cabrera, M. Caccia, M. Calvi, T. Camporesi, V. Canale, F. Carena, L. Carroll, C. Caso, M V. Castillo-Gimenez, A. Cattai, F R. Cavallo, V. Chabaud, P. Charpentier, P. Checchia, G A. Chelkov, R. Chierici, P. Shlyapnikov, P. Chochula, V. Chorowicz, J. Chudoba, K. Cieslik, P. Collins, R. Contri, E. Cortina, G. Cosme, F. Cossutti, M. Costa, H B. Crawley, D. Crennell, S. Crepe, G. Crosetti, J. Cuevas-Maestro, S. Czellar, M. Davenport, W. Da Silva, G. Della Ricca, P A. Delpierre, N. Demaria, A. De Angelis, W. De Boer, C. De Clercq, B. De Lotto, A. De Min, L. De Paula, H. Dijkstra, L. Di Ciaccio, J. Dolbeau, K. Doroba, M. Dracos, J. Drees, M. Dris, A. Duperrin, J D. Durand, G. Eigen, T. Ekeloef, G. Ekspong, M. Ellert, M. Elsing, J.P. Engel, M. Espirito Santo, G. Fanourakis, D. Fassouliotis, J. Fayot, M. Feindt, A. Ferrer, E. Ferrer-Ribas, F. Ferro, S. Fichet, A. Firestone, U. Flagmeyer, H. Foeth, E. Fokitis, F. Fontanelli, B. Franek, A G. Frodesen, R. Fruehwirth, F. Fulda-Quenzer, J. Fuster, A. Galloni, D. Gamba, S. Gamblin, M. Gandelman, C. Garcia, C. Gaspar, M. Gaspar, U. Gasparini, P. Gavillet, E N. Gazis, D. Gele, T. Geralis, L. Gerdyukov, N. Ghodbane, I. Gil, F. Glege, R. Gokieli, B. Golob, G. Gomez-Ceballos, P. Goncalves, I. Gonzalez-Caballero, G. Gopal, L. Gorn, Yu. Guz, V. Gracco, J. Grahl, E. Graziani, P. Gris, G. Grosdidier, K. Grzelak, J. Guy, C. Haag, F. Hahn, S. Hahn, S. Haider, A. Hallgren, K. Hamacher, J. Hansen, F J. Harris, F. Hauler, V. Hedberg, S. Heising, J J. Hernandez, P. Herquet, H. Herr, T L. Hessing, J M. Heuser, E. Higon, S O. Holmgren, P J. Holt, S. Hoorelbeke, M. Houlden, J. Hrubec, M. Huber, K. Huet, G J. Hughes, K. Hultqvist, J N. Jackson, R. Jacobsson, P. Jalocha, R. Janik, C. Jarlskog, G. Jarlskog, P. Jarry, B. Jean-Marie, D. Jeans, E K. Johansson, P. Jonsson, C. Joram, P. Juillot, L. Jungermann, F. Kapusta, K. Karafasoulis, S. Katsanevas, E C. Katsoufis, R. Keranen, G. Kernel, B P. Kersevan, Yu. Khokhlov, B A. Khomenko, N N. Khovanskii, A. Kiiskinen, B J. King, A. Kinvig, N J. Kjaer, O. Klapp, H. Klein, P. Kluit, P. Kokkinias, V. Kostyukhin, C. Kourkoumelis, O. Kuznetsov, M. Krammer, E. Kriznic, Z. Krumshtein, P. Kubinec, J. Kurowska, K. Kurvinen, J W. Lamsa, D W. Lane, J P. Laugier, R. Lauhakangas, G. Leder, F. Ledroit, V. Lefebure, L. Leinonen, A. Leisos, R. Leitner, G. Lenzen, V. Lepeltier, T. Lesiak, M. Lethuillier, J. Libby, W. Liebig, D. Liko, A. Lipniacka, I. Lippi, B. Loerstad, J G. Loken, J H. Lopes, J M. Lopez, R. Lopez-Fernandez, D. Loukas, P. Lutz, L. Lyons, J. MacNaughton, J R. Mahon, A. Maio, A. Malek, T G M. Malmgren, S. Maltezos, V. Malychev, F. Mandl, J. Marco, R. Marco, B. Marechal, M. Margoni, J C. Marin, C. Mariotti, A. Markou, C. Martinez-Rivero, I Garcia S. Marti, J. Masik, N. Mastroyiannopoulos, F. Matorras, C. Matteuzzi, G. Matthiae, F. Mazzucato, M. Mazzucato, M. McCubbin, R. McKay, R. McNulty, G. McPherson, C. Meroni, W T. Meyer, E. Migliore, L. Mirabito, W A. Mitaroff, U. Mjoernmark, T. Moa, M. Moch, R. Moller, K. Moenig, M R. Monge, D. Moraes, X. Moreau, P. Morettini, G. Morton, U. Mueller, K. Muenich, M. Mulders, C. Mulet-Marquis, R. Muresan, W J. Murray, B. Muryn, G. Myatt, T. Myklebust, F. Naraghi, M. Nassiakou, F L. Navarria, K. Nawrocki, P. Negri, N. Neufeld, R. Nicolaidou, B S. Nielsen, P. Niezurawski, M. Nikolenko, V. Nomokonov, A. Nygren, V F. Obraztsov, A G. Olshevskii, A. Onofre, R. Orava, G. Orazi, K. Osterberg, A. Ouraou, A. Oyanguren, M. Paganoni, S. Paiano, R. Pain, R. Paiva, J. Palacios, H. Palka, T D. Papadopoulou, L. Pape, C. Parkes, F. Parodi, U. Parzefall, A. Passeri, O. Passon, T. Pavel, M. Pegoraro, L. Peralta, M. Pernicka, A. Perrotta, C. Petridou, A. Petrolini, H T. Phillips, F. Pierre, M. Pimenta, E. Piotto, T. Podobnik, M E. Pol, G. Polok, P. Poropat, V. Pozdnyakov, P. Privitera, N. Pukhaeva, A. Pullia, D. Radojicic, S. Ragazzi, H. Rahmani, J. Rames, P N. Ratoff, A L. Read, P. Rebecchi, N G. Redaelli, M. Regler, J. Rehn, D. Reid, P. Reinertsen, R. Reinhardt, P B. Renton, L K. Resvanis, F. Richard, J. Ridky, G. Rinaudo, I. Ripp-Baudot, O. Rohne, A. Romero, P. Ronchese, E I. Rosenberg, P. Rosinsky, P. Roudeau, T. Rovelli, C. Royon, V. Ruhlmann-Kleider, A. Ruiz, H. Saarikko, Y. Sacquin, A. Sadovskii, G. Sajot, J. Salt, D. Sampsonidis, M. Sannino, P. Schwemling, B. Schwering, U. Schwickerath, F. Scuri, P. Seager, Yu. Sedykh, F. Seemann, A M. Segar, N. Seibert, R. Sekulin, R C. Shellard, M. Siebel, L. Simard, F. Simonetto, A N. Sissakian, G. Smadja, N. Smirnov, O. Smirnova, G R. Smith, A. Sokolov, O. Solovyanov, A. Sopczak, R. Sosnowski, Tz. Spassoff, E. Spiriti, S. Squarcia, C. Stanescu, S. Stanic, M. Stanitzki, K. Stevenson, A. Stocchi, J. Strauss, R. Strub, B. Stugu, M. Szczekowski, M. Szeptycka, T. Tabarelli De Fatis, A. Taffard, F. Tegenfeldt, F. Terranova, J. Thomas, J. Timmermans, N. Tinti, L G. Tkatchev, M. Tobin, S. Todorova, A G. Tomaradze, B. Tome, A. Tonazzo, L. Tortora, Pablo Tortosa, G. Transtroemer, D. Treille, G. Tristram, M. Trochimczuk, C. Troncon, M L. Turluer, I A. Tyapkin, P. Tyapkin, S. Tzamarias, O. Ullaland, V. Uvarov, G. Valenti, E. Vallazza, P. Van Dam, W. Van Den Boeck, J. Van Eldik, A. Van Lysebetten, N. Van Remortel, I. Van Vulpen, G. Vegni, L. Ventura, W. Venus, F. Verbeure, P. Verdier, M. Verlato, L S. Vertogradov, V. Verzi, D. Vilanova, L. Vitale, E. Vlasov, A. Vodopyanov, G. Voulgaris, V. Vrba, H. Wahlen, C. Walck, A J. Washbrook, C. Weiser, D. Wicke, J H. Wickens, G R. Wilkinson, M. Winter, M. Witek, G. Wolf, J. Yi, O. Yushchenko, A. Zalewska, P. Zalewski, D. Zavrtanik, E. Zevgolatakos, N I. Zimin, A. Zintchenko, P. Zoller, G C. Zucchelli, G. Zumerle and W. Beckmann

Abstract

Production of $\sm$ and $\lft$ in hadronic Z decays has been measuredusing the \delphi detector at \lep. The $\sm$ is directly reconstructed as acharged track in the \delphi microvertex detector and is identified by its$\sdec$ decay leading to a kink between the $\sm$ and $\pi$-track.The reconstruction of the $\lft$ resonance relies strongly on theparticle identification capabilities of the barrel Ring Imaging Cherenkovdetector and on the ionisation loss measurement of the TPC.Inclusive production spectra are measured for both particles.The production rates are measured to be\begin{eqnarray*}\langle N_{\sm}/N_{\rm Z}^{\rm had} \rangle &=& 0.081 \pm 0.002 \pm 0.010~, \\ \langle N_{\lft}/N_{\rm Z}^{\rm had} \rangle &=& 0.029 \pm 0.005 \pm 0.005~.\end{eqnarray*}%The comparably large production rate of the $\lft$ suggestsThe production rate of the $\lft$ suggests that a large fraction of the stable baryons descend from orbibaryonic states.It is shown that the baryon production rates in Z decays follwa universal phenomenological law related to isospin, strangendmass of the particles

Topics: [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: Elsevier
Year: 2000
OAI identifier: oai:HAL:in2p3-00004112v1
Provided by: Hal-Diderot
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