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Search for supersymmetric particles with R-parity violation; Recherche de particules supersymetriques avec violation de la R-parite

Abstract

Searches for new particles are presented under the assumption that the R-parity, taking the value +1 for all the ordinary particles and -1 for their supersymmetric partners, is not conserved. We suppose that the dominant R-parity violating couplings involve only leptonic fields and that the lifetime of the lightest supersymmetric particle can be neglected. Sleptons, squarks and neutralinos pairs searches have been performed in a data sample collected by the ALEPH detector, at the e{sup +}e{sup -} collider LEP, from 1989 to 1993. In this statistic, corresponding to almost two million hadronic {Zeta} decays, no signal was observed. As a result, supersymmetric particle masses and couplings are at least as well constrained as under the usual assumption of R-parity conservation. In a second part, the ALEPH Beam Monitor system (BOMs) is studied. The BOMs, located at 65 m from the ALEPH interaction region, allow the determination of the beam position at the interaction point. The comparison of the 1994 BOM measurements, with the beam position measured by the ALEPH vertex detector, shows sizeable systematic differences. A position monitoring system of the quadrupoles closet to the interaction point has been installed in 1995 and allows the agreement between the BOMs and  More>>
Authors:
Publication Date:
Dec 01, 1995
Product Type:
Thesis/Dissertation
Report Number:
LAL-95-89
Reference Number:
SCA: 662120; 662440; 440104; PA: AIX-27:049037; EDB-96:101983; NTS-96:018698; NTS-96:019028; SN: 96001612242
Resource Relation:
Other Information: TH: These (D. es Sc.).; PBD: Dec 1995
Subject:
66 PHYSICS; 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; LEP STORAGE RINGS; BEAM MONITORS; ELECTRON-POSITRON COLLISIONS; PARTICLE IDENTIFICATION; SPARTICLES; PARITY; SUPERSYMMETRY; BEAM POSITION; BEAM-BEAM INTERACTIONS; CHIRAL SYMMETRY; GAUGE INVARIANCE; HIGGS BOSONS; LAGRANGIAN FIELD THEORY; PAIR PRODUCTION; QUADRUPOLES; SHOWER COUNTERS; SPIN; STANDARD MODEL; SUPERGRAVITY; SYMMETRY BREAKING; TIME PROJECTION CHAMBERS; Z NEUTRAL BOSONS
OSTI ID:
246837
Research Organizations:
Paris-11 Univ., 91 - Orsay (France). Lab. de l`Accelerateur Lineaire
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE96627814; TRN: FR9602008049037
Availability:
INIS; OSTI as DE96627814
Submitting Site:
FRN
Size:
166 p.
Announcement Date:
Jul 12, 1996

Citation Formats

Jacquet, M. Search for supersymmetric particles with R-parity violation; Recherche de particules supersymetriques avec violation de la R-parite. France: N. p., 1995. Web.
Jacquet, M. Search for supersymmetric particles with R-parity violation; Recherche de particules supersymetriques avec violation de la R-parite. France.
Jacquet, M. 1995. "Search for supersymmetric particles with R-parity violation; Recherche de particules supersymetriques avec violation de la R-parite." France.
@misc{etde_246837,
title = {Search for supersymmetric particles with R-parity violation; Recherche de particules supersymetriques avec violation de la R-parite}
author = {Jacquet, M}
abstractNote = {Searches for new particles are presented under the assumption that the R-parity, taking the value +1 for all the ordinary particles and -1 for their supersymmetric partners, is not conserved. We suppose that the dominant R-parity violating couplings involve only leptonic fields and that the lifetime of the lightest supersymmetric particle can be neglected. Sleptons, squarks and neutralinos pairs searches have been performed in a data sample collected by the ALEPH detector, at the e{sup +}e{sup -} collider LEP, from 1989 to 1993. In this statistic, corresponding to almost two million hadronic {Zeta} decays, no signal was observed. As a result, supersymmetric particle masses and couplings are at least as well constrained as under the usual assumption of R-parity conservation. In a second part, the ALEPH Beam Monitor system (BOMs) is studied. The BOMs, located at 65 m from the ALEPH interaction region, allow the determination of the beam position at the interaction point. The comparison of the 1994 BOM measurements, with the beam position measured by the ALEPH vertex detector, shows sizeable systematic differences. A position monitoring system of the quadrupoles closet to the interaction point has been installed in 1995 and allows the agreement between the BOMs and ALEPH vertex detector data to be improved. Moreover, a new method for the calibration of the electronic ALEPH BOMs system is developed. (author). 54 refs., 75 figs. 15 tabs.}
place = {France}
year = {1995}
month = {Dec}
}