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GIUSEPPE RASO

Measurement of the W boson mass and width in e+e- collisions at LEP

  • Autori: 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
  • Anno di pubblicazione: 2006
  • Tipologia: Articolo in rivista (Articolo in rivista)
  • OA Link: http://hdl.handle.net/10447/17270

Abstract

The mass of the W boson is determined from the direct reconstruction of W decays in WW→qq̄qq̄ and WW→ℓνqq̄ events in e+e- collisions at LEP. The data sample corresponds to an integrated luminosity of 683 pb-1 collected with the ALEPH detector at centre-of-mass energies up to 209 GeV. To minimise any effect from colour reconnection a new procedure is adopted in which low energy particles are not considered in the mass determination from the qq̄qq̄ channel. The combined result from all channels is mW=80.440±0.043(stat.)±0.024(syst.)±0.009(FSI)±0.009(LEP)GeV/c2,where FSI represents the possible effects of final state interactions in the qq̄qq̄ channel and LEP indicates the uncertainty in the beam energy. From two-parameter fits to the W mass and width, the W width is found to be ΓW=2.14±0.09(stat.)±0.04(syst.)±0.05(FSI)±0.01(LEP)GeV