Published October 1990 | Version v1
Report Open

Searching for the top at UA2

Creators

Description

The projects conceived for searching the quark top, predicted by the Standard Model, are described. The required existence of the quark top from the Standard Model and its production from proton-antiproton collisions are reviewed. The UA2 experimental device is described. The method applied for the search of the top is explained. The analysis of the UA2 data does not allow to conclude the existence of the top. However, the low mass limit of 69 GeV/C2 can be established for the top mass. The results of the analysis of the W decays into supersymmetric particles are included

Availability note (English)

MF available from INIS under the Report Number.

Abstract (French)

Dans ce rapport, nous decrivons la recherche d'une particule predite par le Modele Standard et qui n'a pas encore ete mise en evidence: le quark top. Dans une premiere partie, nous rappellerons brievement le cadre du Modele Standard et la necessite du quark top. Nous indiquerons egalement les modes eventuels de production du top dans les collisions protons-antiprotons. Dans la seconde partie, nous decrirons l'experience UA2', qui a ete utilisee pour rechercher le top dans des collisions protons-antiprotons a √s = 630 GeV. Enfin, dans la troisieme partie, nous exposerons la methode utilisee pour chercher le top, nous montrerons que les donnees accumulees par UA2 ne donnent pas d'evidence pour un signal de top et permettent par consequent d'obtenir une limite inferieure sur sa masse mtop > 69 GeV/c2. Nous exposerons egalement les resultats d'une analyse assez proche sur la recherche de desintegrations de W en particules supersymetriques dans le dernier chapitre

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Additional details

Additional titles

Original title (French)
Recherche du top dans UA2

Publishing Information

Imprint Pagination
61 p.
Report number
LAL--90-65

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
23003159
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI
GEV RANGE 100-1000; PARTICLE DECAY; PARTICLE IDENTIFICATION; PARTICLE PRODUCTION; PARTICLE WIDTHS; PROTON-ANTIPROTON INTERACTIONS; QUARKS; STANDARD MODEL; TOP PARTICLES; W MINUS BOSONS; W PLUS BOSONS
Descriptors DEC
BARYON-BARYON INTERACTIONS; BOSONS; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FIELD THEORIES; GEV RANGE; GRAND UNIFIED THEORY; HADRON-HADRON INTERACTIONS; INTERACTIONS; INTERMEDIATE BOSONS; INTERMEDIATE VECTOR BOSONS; MATHEMATICAL MODELS; NUCLEON-ANTINUCLEON INTERACTIO; PARTICLE INTERACTIONS; PARTICLE MODELS; PARTICLE PROPERTIES; POSTULATED PARTICLES; QUANTUM FIELD THEORY; UNIFIED GAUGE MODELS