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Phenomenology and research for squarks at LEP200 with the DELPHI detector; Phenomenologie et recherche de squarks a LEP200 avec le detecteur delphi

Abstract

This thesis is devoted to the study of some supersymmetric quarks such as s-top and s-bottom. This investigation field is all the more interesting since the weak mass of these squarks could be explained by the strong Yukawa coupling between top and bottom quarks. The theoretical framework is defined and the insufficiency of the standard model is highlighted. Different models such as MSSM, supergravity models in which supersymmetry is a global symmetry are described. Squark phenomenology at LEP200 is exposed and the most likely disintegration channels for stop and s-bottom quarks are investigated in various models (MSSM, mSUGRA, supergravity models with light gravitino). The experimental tool used in this work, DELPHI detector is presented, the main elements involved in the search for squarks are precisely described. The last part of this thesis is dedicated to the effective search for squarks, the analysis deals with the energies: {radical}s=161, 172 and 183 GeV for which the luminosity values collected by DELPHI are respectively 9.7, 10 and 54 pb{sup -1}. The results are interpreted within the frameworks of different supersymmetric theories 184 refs.
Authors:
Gris, Ph [1] 
  1. CEA Saclay, 91 - Gif-sur-Yvette (France). Dept. d`Astrophysique, de la Physique des Particules, de la Physique Nucleaire et de l`Instrumentation Associee
Publication Date:
May 01, 1998
Product Type:
Technical Report
Report Number:
DAPNIA-SPP-98-1001
Reference Number:
SCA: 662440; PA: AIX-30:035072; EDB-99:082773; SN: 99002122268
Resource Relation:
Other Information: DN: 184 refs.; PBD: May 1998
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; B QUARKS; DATA ANALYSIS; ELECTRON-POSITRON COLLISIONS; FOUR-PI DETECTORS; GLUON MODEL; LEP STORAGE RINGS; PARTICLE DECAY; QUARK MODEL; RADIATION DETECTION; SPARTICLES; STANDARD MODEL; SUPERGRAVITY; SUPERSYMMETRY; SYMMETRY BREAKING; T QUARKS; 662440; PROPERTIES OF OTHER PARTICLES INCLUDING HYPOTHETICAL PARTICLES
OSTI ID:
10147231
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France). Dept. d`Astrophysique, de la Physique des Particules, de la Physique Nucleaire et de l`Instrumentation Associee
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE99627790; TRN: FR9805527035072
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
FRN
Size:
254 p.
Announcement Date:
Sep 07, 1999

Citation Formats

Gris, Ph. Phenomenology and research for squarks at LEP200 with the DELPHI detector; Phenomenologie et recherche de squarks a LEP200 avec le detecteur delphi. France: N. p., 1998. Web.
Gris, Ph. Phenomenology and research for squarks at LEP200 with the DELPHI detector; Phenomenologie et recherche de squarks a LEP200 avec le detecteur delphi. France.
Gris, Ph. 1998. "Phenomenology and research for squarks at LEP200 with the DELPHI detector; Phenomenologie et recherche de squarks a LEP200 avec le detecteur delphi." France.
@misc{etde_10147231,
title = {Phenomenology and research for squarks at LEP200 with the DELPHI detector; Phenomenologie et recherche de squarks a LEP200 avec le detecteur delphi}
author = {Gris, Ph}
abstractNote = {This thesis is devoted to the study of some supersymmetric quarks such as s-top and s-bottom. This investigation field is all the more interesting since the weak mass of these squarks could be explained by the strong Yukawa coupling between top and bottom quarks. The theoretical framework is defined and the insufficiency of the standard model is highlighted. Different models such as MSSM, supergravity models in which supersymmetry is a global symmetry are described. Squark phenomenology at LEP200 is exposed and the most likely disintegration channels for stop and s-bottom quarks are investigated in various models (MSSM, mSUGRA, supergravity models with light gravitino). The experimental tool used in this work, DELPHI detector is presented, the main elements involved in the search for squarks are precisely described. The last part of this thesis is dedicated to the effective search for squarks, the analysis deals with the energies: {radical}s=161, 172 and 183 GeV for which the luminosity values collected by DELPHI are respectively 9.7, 10 and 54 pb{sup -1}. The results are interpreted within the frameworks of different supersymmetric theories 184 refs.}
place = {France}
year = {1998}
month = {May}
}