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L3 Physics at the Z Resonance and a Search for the Higgs Particle
Thomas A. Coan, W. Wayne Kinnison* Jon Kapustinsky, and Jayant Shukla
Physics Division, Los Alamos National Laboratory
Abstract
This is the final report of a three-year, Laboratory-Directed Research and
Development (LDRD) project at the Los Alamos National Laboratory.
Electroweak interactions were studied using the L3 Detector on the Large
Electron-Positron Collider (LEP) at the European Center for Nuclear Study
(CERN). The specific physics studied utilized the Silicon Microvertex
Detector (SMD) of L3, which Los Alamos had previously played a major
role in proposing, designing, constructing, and commissioning. This dector
enabled L3 to investigate short-lived mesons containing b-quarks.
1. Background and Research Objectives
One of the most successful theories of modern physics is the Standard Model of
Electroweak Interactions. That theory, which explains the unification of electromagnetic and
weak interactions, has been experimentally investigated for almost twenty years. During that
time many experiments have been conducted to test the model with ever increasing levels of
precision in an attempt to uncover possible short comings. The model has never failed to
explain the data. Nevertheless, there are two short comings of the model. One is that the model
contains a large number of "free" parameters. The other is that one of the basic underpinnings
of the model is that one or more Higgs particles should exist and such particles have never been
observed.
The purpose of this project was to use the L3 Detector on the Large Electron-Positron
Collider (LEP) at the European Center for Nuclear Study (CERN) to study electroweak
interactions. That work was carried out while the LEP operated on the Z resonance and when
it first increased its center-of-mass energy to 140 GeV. The specific studies that the
*Principal Investigator, e-mail: wwk@lanl.gov1
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Coan, T.A.; Kinnison, W.W.; Kapustinsky, J. & Shukla, J. L3 physics at the Z resonance and a search for the Higgs particle, report, July 1, 1997; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc674221/m1/3/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.