Published May 25, 1998 | Version v1
Miscellaneous Open

Measurement of W± boson mass at LEP by means of DELPHI detector / Direct measurement of the W± boson mass at LEP with the DELPHI detector

Creators

  • 1. Universite Louis Pasteur, Institut de Recherches Subatomiques, 67 - Strasbourg (France)

Description

The thesis deals with measurement of the mass of the W boson at LEP2, based on the direct reconstruction of its decay products in the hadronic channel. A set of procedures necessary for the extraction of the W mass from the experimental data collected with the DELPHI detector in 1997 was developed (search of optimal variables for the event selection, development of a special method of kinematical reconstruction). The measured value of the mass was interpreted in the framework of the Standard Model, allowing to constrain the mass of the Higgs boson. A substantial part of the work is devoted to systematic effects due to the interactions between the hadronic decay products of the W bosons (colour reconnection and Bose-Einstein correlations), which may significantly influence the measurement of their mass. (author)

Abstract (French)

La these porte sur la mesure de la masse du boson W a LEP2 par la methode de la reconstruction directe de ses produits de desintegration dans le canal hadronique. Des outils specifiques necessaires a l'extraction de la valeur de la masse du boson W a partir des donnees collectees avec l'appareillage delphi en 1997 ont ete developpes (recherche de variables optimales pour selectionner les evenements ww, mise au point d'une methode specifique de reconstruction cinematique). La valeur observee de la masse du boson W a ete interpretee dans le cadre du modele standard, notamment pour contraindre la masse du boson de higgs. Une partie importante est consacree aux effets systematiques provenant des interactions entre les produits de desintegration hadronique des bosons W (reconnection de couleur et correlations de bose-einstein), qui peuvent notoirement influer sur la mesure de leur masse

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Additional details

Additional titles

Original title (English)
Mesure de la masse des bosons W± au LEP a l'aide du detecteur DELPHI

Publishing Information

Imprint Pagination
167 p.
Report number
IReS--98-18

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
53027292
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Thesis
Descriptors DEI
CHARGED PARTICLE DETECTION; FOUR-PI DETECTORS; HADRONIC PARTICLE DECAY; HIGGS BOSONS; LEP STORAGE RINGS; MASS; PARTICLE IDENTIFICATION; PHOTONS; RADIATION DETECTION; STANDARD MODEL; W MINUS BOSONS; W PLUS BOSONS
Descriptors DEC
ACCELERATORS; BOSONS; CYCLIC ACCELERATORS; DECAY; DETECTION; ELEMENTARY PARTICLES; FIELD THEORIES; GRAND UNIFIED THEORY; INTERMEDIATE BOSONS; INTERMEDIATE VECTOR BOSONS; MASSLESS PARTICLES; MATHEMATICAL MODELS; MEASURING INSTRUMENTS; PARTICLE DECAY; PARTICLE MODELS; QUANTUM FIELD THEORY; RADIATION DETECTION; RADIATION DETECTORS; STORAGE RINGS; SYNCHROTRONS; UNIFIED GAUGE MODELS

Optional Information

Notes
53 refs., 104 figs., 33 tabs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses; This record replaces 30041472