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Inclusive Production of $\pi^{0}, \eta, \eta'(958), K^0_s$ and $\Lambda$ in Two- and Three-Jet Events from Hadronic Z Decays

R. Barate 1 D. Decamp 1 P. Ghez 1 C. Goy 1 J P. Lees 1 E. Merle 1 M N. Minard 1 B. Pietrzyk 1 R. Alemany M P. Casado M. Chmeissani J M. Crespo E. Fernandez M. Fernandez-Bosman L. Garrido E. Grauges A. Juste M. Martinez G. Merino R. Miquel L M. Mir A. Pacheco I C. Park I. Riu A. Colaleo D. Creanza M. de Palma G. Iaselli G. Maggi M. Maggi S. Nuzzo A. Ranieri G. Raso F. Ruggieri G. Selvaggi L. Silvestris P. Tempesta A. Tricomi G. Zito X. Huang Jiali Lin Q. Ouyang T. Wang Y. Xie R. Xu S. Xue J. Zhang L. Zhang W. Zhao D. Abbaneo U. Becker G. Boix M. Cattaneo F. Cerutti V. Ciulli G. Dissertori H. Drevermann R W. Forty M. Frank T C. Greening a W. Halley J B. Hansen J. Harvey P. Janot B. Jost I. Lehraus O. Leroy P. Mato A. Minten A. Moutoussi F. Ranjard L. Rolandi D. Schlatter M. Schmitt O. Schneider P. Spagnolo W. Tejessy F. Teubert I R. Tomalin E. Tournefier a E. Wright Ziad Ajaltouni 2 F. Badaud 2 G. Chazelle 2 O. Deschamps 2 Alain Falvard 2 C. Ferdi 2 Pascal Gay 2 C. Guicheney 2 Pierre Henrard 2 J. Jousset 2 B. Michel 2 S. Monteil 2 Jean-Claude Montret 2 D. Pallin 2 Pascal Perret 2 F. Podlyski 2 J D. Hansen J R. Hansen P H. Hansen B S. Nilsson B. Rensch A. Waananen G. Daskalakis A. Kyriakis C. Markou E. Simopoulou I. Siotis A. Vayaki A. Blondel 3 G. Bonneaud J C. Brient 3 A. Rouge 3 M. Rumpf 3 M. Swynghedauw 3 M. Verderi H. Videau 3 E. Focardi G. Parrini K. Zachariadou R. Cavanaugh M. Corden C. Georgiopoulos A. Antonelli G. Bencivenni G. Bologna F. Bossi P. Campana G. Capon V. Chiarella P. Laurelli G. Mannocchi F. Murtas G P. Murtas L. Passalacqua M. Pepe-Altarelli L. Curtis J G. Lynch P. Negus V. O'Shea C. Raine P. Teixeira-Dias a S. Thompson O. Buchmuller S. Dhamotharan C. Geweniger P. Hanke G. Hansper V. Hepp E E. Kluge A. Putzer J. Sommer K. Tittel S. Werner M. Wunsch R. Beuselinck D M. Binnie W. Cameron P J. Dornan M. Girone S. Goodsir E B. Martin N. Marinelli A. Sciaba J K. Sedgbeer E. Thomson M D. Williams V M. Ghete P. Girtler E. Kneringer D. Kuhn G. Rudolph C K. Bowdery P G. Buck a J. Finch F. Foster G. Hughes R W L. Jones N A. Robertson M I. Williams I. Giehl K. Jakobs K. Kleinknecht G. Quast B. Renk E. Rohne H G. Sander H. Wachsmuth C. Zeitnitz J.J. Aubert 4 C. Benchouk 4 A. Bonissent 4 J. Carr 4 P. Coyle 4 F. Etienne 4 F. Motsch 4 P. Payre 4 D. Rousseau 4 M. Talby 4 M. Thulasidas 4 M. Aleppo M. Antonelli F. Ragusa V. Buscher H. Dietl G. Ganis K. Huttmann G. Lutjens C. Mannert W. Manner H G. Moser S. Schael R. Settles H. Seywerd H. Stenzel W. Wiedenmann G. Wolf P. Azzurri 5 J. Boucrot 5 O. Callot 5 S. Chen 5 A. Cordier 5 M. Davier 5 L. Duflot 5 J F. Grivaz P. Heusse 5 A. Jacholkowska 5 F. Le Diberder 5 J. Lefrancois a M. Lutz 5 M H. Schune 5 J J. Veillet 5 I. Videau 5 D. Zerwas 5 G. Bagliesi T. Boccali C. Bozzi G. Calderini R. Dell'Orso I. Ferrante L. Foa A. Giassi A. Gregorio F. Ligabue P S. Marrocchesi A. Messineo F. Palla G. Rizzo G. Sanguinetti G. Sguazzoni R. Tenchini A. Venturi P G. Verdini G A. Blair G. Cowan M G. Green T. Medcalf J A. Strong D R. Botterill R W. Clifft T R. Edgecock P R. Norton J C. Thompson B. Bloch-Devaux P. Colas S. Emery W. Kozanecki E. Lancon M C. Lemaire E. Locci P. Perez J. Rander J F. Renardy A. Roussarie J P. Schuller J. Schwindling A. Trabelsi B. Vallage S N. Black J H. Dann R P. Johnson H Y. Kim N. Konstantinidis a M. Litke M A. Mcneil G. Taylor C N. Booth S. Cartwright F. Combley M. Lehto L F. Thompson K. Affholderbach A. Bohrer S. Brandt C. Grupen J. Hess C. Koob A. Misiejuk G. Prange U. Sieler G. Giannini B. Gobbo J E. Rothberg S. Wasserbaech S R. Armstrong P. Elmer D P S. Ferguson Y. Gao S. Gonzalez O J. Hayes H. Hu S. Jin J. Kile P A. Mcnamara J. Nielsen W. Orejudos y B. Pan Y. Saadi I J. Scott J. Walsh J H. von Wimmersperg-Toeller S L. Wu X. Wu G. Zobernig
Abstract : The production rates and the inclusive cross sections of the isovector meson $\pi^0$, the isoscalar mesons $\eta$ and $\eta^\prime(958)$, the strange meson $\mathrm{K^0_S}$ and the $\Lambda$ baryon have been measured as functions of scaled energy in hadronic events two-jet events and each jet of three-jet events from hadronic Z decays and compared to Monte Carlo models. The analysis is based on 3.7~million hadronic events collected with the ALEPH detector at LEP at a centre-of-mass energy of $\sqrt{s}=91.2$~GeV. The JETSET modelling of the gluon fragmentation into isoscalar mesons is found to be in agreement with the experimental results. HERWIG fails to describe the $\mathrm{K^0_S}$ spectra in gluon-enriched jets and the $\Lambda$ spectra in quark jets.
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Submitted on : Thursday, November 16, 2000 - 5:35:29 PM
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R. Barate, D. Decamp, P. Ghez, C. Goy, J P. Lees, et al.. Inclusive Production of $\pi^{0}, \eta, \eta'(958), K^0_s$ and $\Lambda$ in Two- and Three-Jet Events from Hadronic Z Decays. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2000, 16, pp.613-634. ⟨in2p3-00005199⟩

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