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Exploiting the single-lepton event structure in the search for the top quark

Description: We discuss whether the event structure can be useful in searching for the top quark in the single-lepton channel at the Tevatron, where the main obstacle is a considerable background from QCD W+ multijet production. We restrict our discussion to the case of a Standard Model top quark of heavy mass, M{sub top}>100 GeV.
Date: June 1, 1993
Creator: Cobal, M.; Leone, S. & Grassman, H.
Partner: UNT Libraries Government Documents Department

[High Energy Physics Program at the University of Alabama. Final report]

Description: The High Energy Physics group at University of Alabama is a member of the L3 collaboration studying e+e{minus} collisions near the Z{degree} pole at the LEP accelerator at CERN. About 2 million Z{degree} events have been accumulated and the experiment has been prolific in publishing results on the Z resonance parameters, the Z couplings to all leptons and quarks with mass less than half the Z mass, searches for new particles and interactions, and studies of strong interactions and/or weak charged current decays of the quarks and leptons abundantly produced in Z decays. The group is contributing to data analysis as well as to detector hardware. In particular, the authors are involved in a major hardware upgrade for the experiment, namely the design, construction and commissioning of a Silicon Microvertex Detector (SMD) which has successfully been installed for operation during the present grant period. The authors present here a report on their recent L3 activities and their plans for the next grant period of twelve months (April 1, 1994--March 31, 1995). Their main interests in data analysis are in the study of single photon final states and the physics made more accessible by the SMD, such as heavy flavor physics. Their hardware efforts continue to be concentrated on the high precision capacitive and optical alignment monitoring systems for the SMD and also includes gas monitoring for the muon system. They are also planning to participate in the coming upgrade of the L3 detector.
Date: October 1, 1993
Creator: Baksay, L. & Busenitz, J.K.
Partner: UNT Libraries Government Documents Department

Overview of the GEM muon system cosmic ray test program at the SSCL

Description: Muon track resolution exceeding 75-{mu}m per plane is one of the main strengths of the GEM detector design, and will be crucial in searches for Higgs Bosons, heavy Z-Bosons, technicolor, and supersymmetry. Achieving this resolution coal requires improved precision in muon chambers and their alignment. A cosmic ray test stand known as the Texas Test Rio, (TTR) has been created at the SSCL for studying candidate GEM muon chamber technologies. Test results led to selecting Cathode Strip Chambers (CSC) as the GEM muon system baseline chamber technology.
Date: April 1, 1993
Creator: Milner, E.C.
Partner: UNT Libraries Government Documents Department

Duke University High Energy Physics; Progress report, December 1, 1990--March 15, 1993

Description: The research program of the Duke High Energy Physics Group is described in this Progress Report and a separate Proposal containing their plans for 1994. These two documents are supplemented by compilations of selected publications, thesis abstracts, and the curriculum vitae of the eleven Ph.D. physicists who are carrying out this research program. This Progress Report contains a review of the research which has been done over the first half (1992 and 1993 to date) of the current three-year DOE grant, plus some earlier research to establish a broader perspective of the research interests. High energy physics research at Duke has three components. The first, Task A, is based upon experiments carried out at Fermilab`s Tevatron Collider. The group is finishing the analysis of data from their first collider experiment (E735), a study of inclusive particle production from {bar p} p collisions at {radical}{bar s} = 1.8 TeV. The second component of the research, Task B, deals primarily with heavy flavor physics. The third part of the research program, Task D, deals with preparation for research at the SSC. The authors have been active in the development of tracking detectors for the SSC since 1989, and are now concentrating on the design and construction of straw tube drift chambers for the solenoid detector.
Date: March 1, 1993
Creator: Fortney, L.R.; Goshaw, A.T. & Walker, W.D.
Partner: UNT Libraries Government Documents Department

Tau physics at p[bar p] colliders

Description: Tau detection techniques in hadron colliders are discussed together with the measurements and searches performed so far. We also underline the importance tau physics has in present and future collider experiments.
Date: January 1, 1993
Creator: Konigsberg, J. (Harvard Univ., Cambridge, MA (United States). High Energy Physics Lab.)
Partner: UNT Libraries Government Documents Department

Search for the top quark and other new particles at D0

Description: Preliminary results from the search for the top quark and other new particles in p[bar p] collisions at [radical]s = 1.8 TeV are reported. In a data sample corresponding to an integrated luminosity of about 7.5 pb[sup [minus]1], one candidate event for top quark is found in the di-lepton channel. A lower limit for the mass of the top quark of 103 GeV/c[sup 2] (99 Gev/c[sup 2]) is obtained at 95% confidence level with (without) background subtraction. Status of searches for other new particles that may arise from new phenomena beyond the standard model is summarized.
Date: September 1, 1993
Creator: Bhat, P.C.
Partner: UNT Libraries Government Documents Department

e[sup [plus]]e[sup [minus]] linear colliders and new particle searches

Description: We discuss future e[sup +]e[sup [minus]] linear colliders and new particle searches that can be done with them. In the discussion of new particle searches we examine the following topics: searches for gauge boson structure, searches for a strongly interacting Higgs sector, top quark studies, Higgs searches, supersymmetric particle searches and measurements of soft supersymmetry breaking parameters.
Date: January 1, 1993
Creator: Barklow, T.L.
Partner: UNT Libraries Government Documents Department

Strange meson spectroscopy in K[omega] and K[phi] at 11 GeV/c and Cherenkov ring imaging at SLD

Description: This thesis consists of two independent parts; development of Cherenkov Ring Imaging Detector (CRID) system and analysis of high-statistics data of strange meson reactions from the LASS spectrometer. Part 1: The CRID system is devoted to charged particle identification in the SLAC Large Detector (SLD) to study e[sup +]e[sup [minus]] collisions at [radical]s = m[sub Z[sup 0]]. By measuring the angles of emission of the Cherenkov photons inside liquid and gaseous radiators, [pi]/K/p separation will be achieved up to [approximately]30 GeV/c. The signals from CRID are read in three coordinates, one of which is measured by charge-division technique. To obtain a [approximately]1% spatial resolution in the charge-division, low-noise CRID preamplifier prototypes were developed and tested resulting in <1000 electrons noise for an average photoelectron signal with 2 [times] 10[sup 5] gain. To help ensure the long-term stability of CRID operation at high efficiency, a comprehensive monitoring and control system was developed. Part 2: Results from the partial wave analysis of strange meson final states in the reactions K[sup [minus]]p [yields] K[sup [minus]][omega]p and K[sup [minus]]p [yields] [bar K][sup 0][phi]n are presented. The analyses are based on data from a 4.1 event/nb exposure of the LASS spectrometer in K[sup [minus]]p interactions at 11 GeV/c. The data sample of K[sup [minus]][omega]p final state contains [approximately]10[sup 5] events. From the partial wave analysis, resonance structures of J[sup P] = 2[sup [minus]], 3[sup [minus]] and 2[sup +] amplitudes are observed in the K[omega] system. The analysis of 2[sup [minus]] amplitudes provides an evidence for two strange meson states in the mass region around 1.75 GeV/c[sup 2]. The appropriate branching fractions are calculated and compared with the SU(3) predictions. The partial wave analysis of [bar K][sup 0][phi] system favors J[sup P] = 1[sup [minus]] and 2[sup +] states in the 1.9--2.0 GeV/c[sup 2] region.
Date: January 1, 1993
Creator: Kwon, Youngjoon.
Partner: UNT Libraries Government Documents Department

Searches for strangelets and other exotics at the AGS

Description: This article describes some experiments either completed, in progress or planned at the Brookhaven National Laboratory AGS. In particular, the experiments described are searches for exotic forms of matter. The existence of such matter could provide a clear signature for the deconfinement or rearrangement of quarks outside the bounds of normal baryons.
Date: January 1, 1993
Creator: Pile, P.H.
Partner: UNT Libraries Government Documents Department