Inclusive production of π0, η, η′ (958), Kg0 s and Λ in two- and three-jet events from hadronic Z decays

R. Barate,D. Décamp,Ph Ghez,Corinne B. Goy,Jean Pierre Lees,E. Merle,Marie Noelle Minard,Bolek Pietrzyk,Ricard Alemany, M. P. Casado,Mokhtar A. Chmeissani,José M. Crespo,Enrique Fernández,M. Fernandez-Bosman,Ll C. Garrido,Eugeni S. Graugés,Aurelio Juste,Mauricio C. Martínez, G. Merino,Ramon Miquel,Ll M. Mir,Alberto J. Pacheco,I. C. Park,Imma Riu,Anna Colaleo,Donato Creanza,Mauro De Palma,Giuseppe Iaselli,Giorgio Pietro Maggi,Marcello Maggi,Salvatore Nuzzo,Antonio Ranieri,Giuseppe Raso,Federico Ruggierí,G. Selvaggi,Lucia Silvestris,Piergiulio Tempesta, Alessia Tricomi,Giuseppe Zito,Xiuping Huáng,Jim Lin,Qun Ouyang,Taijie Wang,Yi Xie,Rui Xu,Shengtian Xue,Jian Zhang,Lei Zhang,Wei Zhao,Duccio Abbaneo,Ulrich J. Becker,Gaëlle Boix,Marco Cattaneo,Francesco Cerutti,V. Ciülli,Günther Dissertori,Hans Drevermann,Roger W. Forty,Markus J. Frank,T. C. Greening,A. W. Halley,Jørgen Beck Hansen,Jeffrey A. Harvey,Patrick Janot,Beat Jost,I. Lehraus,Olivier Leroy,Pere Mató,A. Minten,A. Moutoussi,Florence Ranjard,Luigi Rolandi,Dieter Schlatter,Michael Schmitt,Olivier Schneider,Paolo Spagnolo,W. Tejessy,Frederic Teubert,I. R. Tomalin,E. Toumefier,Alison E. Wright,Zeina J. Ajaltouni,Frédérique Badaud,G. Chazelle,Olivier Deschamps,A. Falvard,Catherine Ferdi,Pascal Gay,C. J. Guicheney,Pierre Henrard,J. C. Jousset,B. Michel,Stéphane Monteil,J. C. Montret,Dominique Pallin,Pascal Perret, F. Podlyski,Jakob Dines Hansen,John Renner Hansen

European Physical Journal C（2000）

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摘要

The production rates and the inclusive cross sections of the isovector meson π0, the isoscalar mesons η and η′ (958), the strange meson K0 s and the A 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 √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 K0 g spectra in gluon-enriched jets and the Λ spectra in quark jets.

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