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GIUSEPPE RASO

Test of colour reconnection models using three-jet events in hadronic Z decays

  • Authors: SCHAEL S; BARATE R; BRUNELIE; RE R; DE BONIS I; DECAMP D; GOY C; JE; ZE; QUEL S; LEES J-; MARTIN F; MERLE E; MINARD M-; PIETRZYK B; TROCME; B; BRAVO S; CASADO MP; CHMEISSANI M; CRESPO JM; FERNANDEZ E; FERNANDEZ-BOSMAN M; GARRIDO L; MARTINEZ M; PACHECO A; RUIZ H; COLALEO A; CREANZA D; DE FILIPPIS N; DE PALMA M; IASELLI G; MAGGI G; MAGGI M; NUZZO S; RANIERI A; RASO G; RUGGIERI F; SELVAGGI G; SILVESTRIS L; TEMPESTA P; TRICOMI A; ZITO G; HUANG X; LIN J; OUYANG Q; WANG T; XIE Y; XU R; XUE S; ZHANG J; ZHANG L; ZHAO W; ABBANEO D; BARKLOW T; BUCHMU; LLER O; CATTANEO M; CLERBAUX B; DREVERMANN H; FORTY RW; FRANK M; GIANOTTI F; HANSEN JB; HARVEY J; HUTCHCROFT DE; JANOT P; JOST B; KADO M; MATO P; MOUTOUSSI A; RANJARD F; ROLANDI L; SCHLATTER D; TEUBERT F; VALASSI A; VIDEAU I; BADAUD F; DESSAGNE S; FALVARD A; FAYOLLE D; GAY P; JOUSSET J; MICHEL B; MONTEIL S; PALLIN D; PASCOLO JM; PERRET P; HANSEN JD; HANSEN JR; HANSEN PH; KRAAN AC; NILSSON BS; KYRIAKIS A; MARKOU C; SIMOPOULOU E; VAYAKI A; ZACHARIADOU K; BLONDEL A; BRIENT J-; MACHEFERT F; ROUGE; A; VIDEAU H; CIULLI V
  • Publication year: 2006
  • Type: Articolo in rivista (Articolo in rivista)
  • Key words: GLUON JETS; QUARK JETS; W-BOSON; LEP; QCD; FRAGMENTATION; SEARCH; MASS; ANNIHILATIONS; GENERATION
  • OA Link: http://hdl.handle.net/10447/3540

Abstract

Hadronic Z decays into three jets are used to test QCD models of colour reconnection (CR). A sensitive quantity is the rate of gluon jets with a gap in the particle rapidity distribution and zero jet charge. Gluon jets are identified by either energy-ordering or by tagging two b-jets. The rates predicted by two string-based tunable CR models, one implemented in JETSET (the GAL model), the other in ARIADNE, are too high and disfavoured by the data, whereas the rates from the corresponding non-CR standard versions of these generators are too low. The data can be described by the GAL model assuming a small value for the R(0) parameter in the range 0.01-0.02.