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Recent Results From DELCO

Description: DELCO is a magnetic spectrometer with Cerenkoc, Time-of-Flight (TOF) and shower counters for particle identification. It is located in IR8 of the PEP storage ring. Data have been obtained at a center of mass energy, ..sqrt..s, of 29 GeV. We report on: (1) the fraction of P, K, ..pi.. in hadronic events; (2) the observation of direct electron signals; and (3) the measurement of D* fragmentation function and its total cross-section. 8 references.
Date: November 1, 1983
Creator: Atwood, W. B.; Baillon, P. H.; Barish, B. C.; Bonneaud, G. R.; DeStaebler, H.; Donaldson, G. J. et al.
Partner: UNT Libraries Government Documents Department
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(Search for strange quark matter and antimatter produced in high energy heavy ion collisions)

Description: This document describes the development and progress of our group's research program in high energy heavy ion physics. We are a subset of the Yale experimental high energy physics effort (YAUG group) who became interested in the physics of high energy heavy ions in 1988. Our interest began with the possibility of performing significant searches for strange quark matter. As we learned more about the subject and as we gained experimental experience through our participation in AGS experiment 814,… more
Date: January 1, 1992
Partner: UNT Libraries Government Documents Department
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Inclusive. pi. /sup + -/, K/sup + -/, and p, anti p production in e/sup +/e/sup -/ annihilation at. sqrt. s = 29 GeV

Description: Measurements of ..pi../sup + -/, K/sup + -/ and p, anti p inclusive cross sections and fractions in e/sup +/e/sup -/ annihilation at ..sqrt..s = 29 GeV are presented. The momentum interval covered corresponds to 0.01 < z < 0.90, where z = pp/sub beam/. The analysis is based on approximately 70 pb/sup -1/ of data collected between 1984 and 1986 with the TPC2..gamma.. detector at PEP. Charged particles are identified by a simultaneous measurement of momentum and ionization energy loss (dEdx). The… more
Date: January 1, 1988
Creator: Cowan, G.D.
Partner: UNT Libraries Government Documents Department
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Is there a P-wave bound state of W sub L W sub L On the dynamical generation of a. rho. meson in the. sigma. model

Description: We investigate the possibility that the Higgs lagrangian predicts the existence of a P-wave W{sub L}W{sub L} resonance. This problem is equivalent to studying the formation of the {rho} meson by the dynamics contained in the {sigma} model. Using the Pade approximation, Basdevant and Lee had claimed that {rho} is generated dynamically. We show that their result, while computationally correct, is not significant, because of the position of the Landau ghost. For the same reason, a W{sub L}W{sub L}… more
Date: October 1, 1991
Creator: Atkinson, D. (Fermi National Accelerator Lab., Batavia, IL (United States) Institute for Theoretical Physics, Groningen, The Netherlands (NL)); Harada, M. (Nagoya Univ. (Japan). Dept. of Physics) & Sanda, A.I. (Superconducting Super Collider Lab., Dallas, TX (United States) Rockefeller Univ., New York, NY (United States). Dept. of Physics)
Partner: UNT Libraries Government Documents Department
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Update to the RHIC Letter of Intent for an experiment on particle and jet production at midrapidity

Description: This document is an Update to the Letter of Intent (LOI) submitted by this collaboration in September 1990 proposing a large acceptance solenoidal tracking experiment. Since that time the collaboration has chosen the name STAR, representing Solenoidal Tracker At RHIC. The physics interests of the STAR collaboration and the goals of the experiment are described in the original LOI. Since submission of the LOI, several changes have been made in the design of the experiment motivated by the desire… more
Date: July 1, 1991
Partner: UNT Libraries Government Documents Department
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Particle identification at an asymmetric B Factory

Description: Particle identification systems are an important component of any detector at a high-luminosity, asymmetric B Factory. In particular, excellent hadron identification is required to probe CP violation in B{sup 0} decays to CP eigenstates. The particle identification systems discussed below also provide help in separating leptons from hadrons at low momenta. We begin this chapter with a discussion of the physics motivation for providing particle identification, the inherent limitations due to int… more
Date: September 1, 1991
Creator: Coyle, P.; Eigen, G.; Hitlin, D.; Oddone, P.; Ratcliff, B.; Roe, N. et al.
Partner: UNT Libraries Government Documents Department
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Summary report of neutral detector subgroup

Description: The advantages and disadvantages of calorimeters for use at ISABELLE are discussed including hadron calorimeters, liquid argon calorimeters, uranium scintillator calorimeters, electromagnetic shower detectors, and iron plate calorimeters. A calorimeter is described that is suitable for electromagnetic and hadronic events and is constructed with a front section of narrow Pb strips to start and develop the electromagnetic shower. A section of U towers to contain hadronic showers follows. This cal… more
Date: January 1, 1977
Creator: Akerlof, C.; Bensinger, J. & Donaldson, G.
Partner: UNT Libraries Government Documents Department
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The physics program of a high-luminosity asymmetric B Factory at SLAC

Description: A high-luminosity asymmetric energy B Factory, proposed as an upgrade to the PEP storage ring at SLAC, provides the best opportunity to study CP violation as a means of testing the consistency of the Standard Model. If the phenomenon of CP violation is explained by the Standard Model simply through the non-zero angles and phase of the Kobayashi-Maskawa matrix, then there are precise relations between the K-M parameters and the various measurable CP-violating asymmetries in B meson decay. Should… more
Date: October 1, 1989
Partner: UNT Libraries Government Documents Department
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Charged hadron production in e/sup /+//e/sup /-// annihilation at. sqrt. s = 29 GeV

Description: We have used data from the Time Projection Chamber at the SLAC storage ring PEP to study the inclusive production of charged hadrons in e/sup /+//e/sup /-// annihilation at a center of mass energy of 29 GeV. Charged particles were identified by simultaneous dEdx and momentum measurements. We present cross sections and particle fractions for ..pi../sup/plus minus//, k/sup + -/, and p(/ovr/p//) as a function of energy, momentum, rapidity, and transverse momentum. We compare the predictions of var… more
Date: March 1, 1988
Creator: Aihara, H.; Alston-Garnjost, M.; Avery, R. E.; Barbaro-Galtieri, A.; Barker, A. R.; Barnett, B. A. et al.
Partner: UNT Libraries Government Documents Department
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Non-accelerator particle physics

Description: The goals of this research are the experimental testing of fundamental theories of physics such as grand unification and the exploration of cosmic phenomena through the techniques of particle physics. We are working on the MACRO experiment, which employs a large area underground detector to search for grand unification magnetic monopoles and dark matter candidates and to study cosmic ray muons as well as low and high energy neutrinos: the {nu}IMB project, which seeks to refurbish and upgrade th… more
Date: September 1, 1991
Creator: Steinberg, R.I. & Lane, C.E.
Partner: UNT Libraries Government Documents Department
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Projection chambers and dE/dx at ISABELLE

Description: The ''standard'' luminosity of 2 x 10/sup 32/ is taken as a goal for a device that measures charged particle momenta over a wide solid angle. It appears that a projection chamber is capable of operation in this mode providing care is taken to optimize the geometry with this high flux in mind. Some calculations have indicated that optimism is required but in no direction have the demands on the apparatus appeared to be well beyond those attainable. In addition dE/dx measurements yielding particl… more
Date: January 1, 1977
Creator: White, D.H.; Benary, O.; Rosenson, L.; Roe, B.; Ditzler, W.R.; Watts, T. et al.
Partner: UNT Libraries Government Documents Department
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The W boson transverse momentum spectrum in proton-antiproton collisions at radical s = 1. 8 TeV

Description: The Collider Detector at Fermilab (CDF) was used to measure the transverse momentum distribution of W boson produced in proton-antiproton collisions at the Tevatron collider. The W bosons were identified by the decay W {yields} e{nu}. The results are in good agreement with a next-to-leading order calculation. The cross section for W production with P{sub T} > 50 GeV/c is 423 {plus minus} 58 (stat.) {plus minus} 108 (sys.) pb. 58 refs., 53 figs., 16 tabs.
Date: February 1, 1991
Creator: Winer, B.L.
Partner: UNT Libraries Government Documents Department
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Cerenkov counters at ISABELLE

Description: Particle mass identification capability will be very important for much of the physics at ISABELLE. It will be required for studying quantum number flow in quark--quark scattering (jet and high P/sub t/ physics), hadronic decays of W's and Z's, and ''onium'' states. It will be essential for detecting and studying ''naked flavor'' states and generally required or at least very useful for most hadronic physics at ISABELLE. The large all-purpose detectors envisioned for ISABELLE require particle i… more
Date: January 1, 1978
Creator: Ashford, V.; Etkin, A.; Honma, A.; Kostoulas, I.; Lanou, R. & Watts, T.
Partner: UNT Libraries Government Documents Department
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The LASS (Larger Aperture Superconducting Solenoid) spectrometer

Description: LASS is the acronym for the Large Aperture Superconducting Solenoid spectrometer which is located in an rf-separated hadron beam at the Stanford Linear Accelerator Center. This spectrometer was constructed in order to perform high statistics studies of multiparticle final states produced in hadron reactions. Such reactions are frequently characterized by events having complicated topologies and/or relatively high particle multiplicity. Their detailed study requires a spectrometer which can prov… more
Date: April 1, 1986
Creator: Aston, D.; Awaji, N.; Barnett, B.; Bienz, T.; Bierce, R.; Bird, F. et al.
Partner: UNT Libraries Government Documents Department
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Resonant production in two photon collisions

Description: Using 220 picobarn/sup /minus/1/ of data collected by the Mark II detector at PEP, we have measured the width of the /eta/' for quasi real photons. The width is separately measured in the three reactions e/sup +/e/sup /minus// ..-->.. e/sup +/e/sup /minus///eta//sup 0/..pi../sup +/..pi../sup /minus//; /eta//sup 0/ ..-->.. ..gamma gamma.., e/sup +/e/sup /minus// ..-->.. e/sup +/e/sup /minus///eta//sup 0/..pi../sup +/..pi../sup /minus//; /eta//sup 0/ ..-->.. ..pi../sup +/..pi../sup /minus//(..pi.… more
Date: December 1, 1988
Creator: Butler, F.
Partner: UNT Libraries Government Documents Department
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Decays of the tau lepton

Description: Previous measurements of the branching fractions of the tau lepton result in a discrepancy between the inclusive branching fraction and the sum of the exclusive branching fractions to final states containing one charged particle. The sum of the exclusive branching fractions is significantly smaller than the inclusive branching fraction. In this analysis, the branching fractions for all the major decay modes are measured simultaneously with the sum of the branching fractions constrained to be on… more
Date: February 1, 1986
Creator: Burchat, P. R.
Partner: UNT Libraries Government Documents Department
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Electron identification and implications in SSC detector design

Description: In the context of Heavy Higgs searches in the decay mode H {yields} ZZ {yields} 4e, electron identification issues and their implications on detector design are discussed (though many of the issues are valid for muon modes as well). The backgrounds considered seem manageable (a net rejection of 100 for combined electron ID and isolation cut is needed and seems fairly straightforward). A detector must have wide electron rapidity coverage {eta} < 2.5 to 3 and the ability to identify and measure a… more
Date: May 1, 1990
Creator: Bensinger, J. (Brandeis Univ., Waltham, MA (USA) Superconducting Super Collider Lab., Dallas, TX (USA)); Wang, E.M. (Lawrence Berkeley Lab., CA (USA)) & Yamamoto, H. (California Univ., Los Angeles, CA (USA))
Partner: UNT Libraries Government Documents Department
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Proposal for a CLEO Precision Vertex Detector

Description: Fermilab experiment E691 and CERN experiment NA32 have demonstrated the enormous power of precision vertexing for studying heavy quark physics. Nearly all collider experiments now have or are installing precision vertex detectors. This is a proposal for a precision vertex detector for CLEO, which will be the pre-eminent heavy quark experiment for at least the next 5 years. The purpose of a precision vertex detector for CLEO is to enhance the capabilities for isolating B, charm, and tau decays a… more
Date: January 1, 1991
Partner: UNT Libraries Government Documents Department
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Charged hadron production in e/sup +/e/sup -/ annihilation at. sqrt. s = 29 GeV

Description: Data from the Time Projection Chamber at the SLAC storage ring PEP have been used to study the inclusive production of charged hadrons. Particles were identified by simultaneous dE/dx and momentum measurements. Cross sections and particle fractions for ..pi../sup + -/, k/sup + -/, and p(anti p) are given as a function of several variables. Predictions of various hadronization models are compared to the data. A comparison is made with other fragmentation processes.
Date: September 1, 1987
Creator: Wolf, Z.
Partner: UNT Libraries Government Documents Department
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Inclusive lepton production in hadronic events from e/sup +/e/sup -/ annihilation at 29 GeV

Description: We have measured the production rates of prompt electrons and muons in hadronic events from e/sup +/e/sup -/ annihilation at 29 GeV. The inclusive rate per hadronic event for leptons with total momenta greater than 2 GeV/c is determined to be (0.033 +- 0.003 +- 0.012) for electrons and (0.037 +- 0.005 +- 0.008) for muons. We measure the longitudinal and transverse momentum spectra of these leptons. The harder transverse momentum spectrum of leptons from bottom and charm quark relative to charm … more
Date: October 1, 1983
Creator: Nelson, M.E.
Partner: UNT Libraries Government Documents Department
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(Relativistic heavy ion research)

Description: At Brookhaven National Laboratory, participation in the E802 Experiment, which is the first major heavy-ion experiment at the BNL-AGS, was the main focus of the group during the past four years. The emphases of the E802 experiment were on (a) accurate particle identification and measurements of spectra over a wide kinematical domain (5{degree} < {theta}{sub LAB} < 55{degree}, p < 20 GeV/c); and (b) measurements of small-angle two-particle correlations, with event characterization tools: multipl… more
Date: January 1, 1990
Partner: UNT Libraries Government Documents Department
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Search for fractionally charged particles in e/sup +/e/sup -/ annihilations

Description: We have searched for the production of free Q = +-1/3e, Q = +-2/3e and Q = +-4/3e particles produced in e/sup +/e/sup -/ collisions at a center-of-mass energy of 29 GeV in 77 pb/sup -1/ of data collected by the time projection chamber at PEP. No evidence has been found for the production of these particles. Upper limits are established on the inclusive cross section for the production of Q = +-1/3e, Q = +-2/3e, and Q = +-4/3e particles in the mass range 1.0 to 13 GeV/c/sup 2/, improving upon pr… more
Date: September 1, 1984
Creator: Huth, J.E.
Partner: UNT Libraries Government Documents Department
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High Energy Physics Research

Description: This report discusses research on: the L3, z neutral boson experiment; the L3 detector; and the development of a SSC detector. (LSP).
Date: January 1, 1991
Partner: UNT Libraries Government Documents Department
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PWCs and drift chambers at ISABELLE

Description: Rate effects in proportional chambers and drift chambers are addressed first. The widely used high-gas-gain chambers would have impaired performance at ISABELLE data rates. Improvement can be expected with lower gas gain, and this possibility is investigated with respect to position and time resolution. Results on chamber lifetime are summarized; space-charge effects, gain saturation, and radiation hardness of electronics are considered. The resolution of drift chambers is discussed in some det… more
Date: January 1, 1978
Creator: Okuno, H.; Teramoto, Y. & Wheeler, C.D.
Partner: UNT Libraries Government Documents Department
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