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Total hadron cross section, new particles, and muon electron events in e/sup +/e/sup -/ annihilation at SPEAR

Description: The review of total hadron electroproduction cross sections, the new states, and the muon--electron events includes large amount of information on hadron structure, nine states with width ranging from 10's of keV to many MeV, the principal decay modes and quantum numbers of some of the states, and limits on charm particle production. 13 references. (JFP)
Date: January 1, 1976
Creator: Richter, B.
Partner: UNT Libraries Government Documents Department
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Radiative corrections in SU/sub 2/ x U/sub 1/ LEP/SLC

Description: We show the sensitivity of various experimental measurements to one-loop radiative corrections in SU/sub 2/ x U/sub 1/. Models considered are the standard GSW model as well as extensions of it which include extra quarks and leptons, SUSY and certain technicolor models. The observation of longitudinal polarization is a great help in seeing these effects in asymmetries in e/sup +/e/sup -/ ..-->.. ..mu../sup +/..mu../sup -/, tau/sup +/tau/sup -/ on Z/sup 0/ resonance. 25 refs., 22 figs., 10 tabs.
Date: June 1, 1985
Creator: Lynn, B. W.; Peskin, M. E. & Stuart, R. G.
Partner: UNT Libraries Government Documents Department
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The neutrinos in muon decay

Description: We review the available information on the identity of the neutrino states emitted in muon decay, and discuss the exotic decay {mu}{sup +} {yields} e{sup +} {bar {nu}}{sub e}{nu}{sub {mu}}. 22 refs.
Date: October 21, 1991
Creator: Herczeg, P.
Partner: UNT Libraries Government Documents Department
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Jet rates from deep inelastic muon scattering in the W range of 15 to 35 GeV

Description: Production rates of forward jets in deep inelastic muon scattering are studied using the JADE jet finding algorithm. The evolution of di-jet rates with W is compared to QCD first order predictions in the W range of 15 to 25 GeV. 7 refs., 3 figs.
Date: August 1, 1991
Creator: Salgado, C.
Partner: UNT Libraries Government Documents Department
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Extracting maximal information on positive muon diffusion in metals

Description: It is discussed how combining zero- and longitudinal-field ..mu..SR can give more information on the motion of the ..mu../sup +/ in the target than zero-field studies alone.
Date: January 1, 1982
Creator: Leon, M.
Partner: UNT Libraries Government Documents Department
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Properties of leptons

Description: The properties of the electron, muon, tau, and their neutrinos are reviewed. Three discrepancies in our understanding of those properties are discussed: the lifetime of orthopositronium, the mass spectra of e{sup +}e{sup -} pairs produced in heavy ion collisions, and the 1-charged particle modes problem in tau decays. The review concludes with a discussion of what we need to learn about the tau and the consequent need for a tau-charm factory. 68 refs., 7 figs., 8 tabs.
Date: December 1, 1989
Creator: Perl, Martin L.
Partner: UNT Libraries Government Documents Department
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Muon Spin-Rotation Study on Magnetite

Description: Muon spin-rotation (..mu..SR) results on synthetic single crystals of magnetite (Fe/sub 3/O/sub 4/) support the idea of muon bond formation in oxides. The anomaly in the temperature dependence of the ..mu..SR signal observed in Fe/sub 3/O/sub 4/ may be attributed to the existence of molecular polarons in the Verwey transition-temperature region.
Date: January 1, 1982
Creator: Boekema, C.; Brabers, V. A. M.; Denison, A. B.; Heffner, R. H.; Hutson, R. L.; Leon, M. et al.
Partner: UNT Libraries Government Documents Department
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Muon number violating rare decays

Description: The experimental status of rare decays that violate muon number conservation is summarized, giving upper limits of their branching ratios with 90% confidence. All of the muon experiments share several common elements. They aim to identify the process sought through the measurement of kinematical variables. Large solid angles are required to reach very high sensitivities. The need for good resolution stresses technology in high-rate environments to suppress backgrounds. In order to understand th… more
Date: January 1, 1985
Creator: Cooper, M.D.
Partner: UNT Libraries Government Documents Department
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Muon Spin-Relaxation Measurements of the Fluctuation Modes in Spin-Glass AgMn

Description: Recently reported zero-field ..mu..SR measurements below the spin-glass transition temperature in AgMn (1.6 at. %) show a temperature dependent inhomogenous width. We discuss these data in terms of a model in which the local field undergoes limited-amplitude fluctuations. We find that both very slow (approx. 0.3 ..mu..s/sup -1/) and rapid (approx. 3000 ..mu..s/sup -1/) fluctuations are required.
Date: January 1, 1982
Creator: Heffner, R. H.; Leon, M.; Schillaci, M. E.; MacLaughlin, D. E. & Dodds, S. A.
Partner: UNT Libraries Government Documents Department
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Tracking and vertex finding with drift chambers and neural networks

Description: Finding tracks, track vertices and event vertices with neural networks from drift chamber signals is discussed. Simulated feed-forward neural networks have been trained with back-propagation to give track parameters using Monte Carlo simulated tracks in one case and actual experimental data in another. Effects on network performance of limited weight resolution, noise and drift chamber resolution are given. Possible implementations in hardware are discussed. 7 refs., 10 figs.
Date: September 1, 1991
Creator: Lindsey, C.
Partner: UNT Libraries Government Documents Department
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Results from beam tests of MEGA's low-mass, high-rate cylindrical MWPCs

Description: One of the leading experimental projects at LAMPF has been the MEGA experiment. This is an experiment to search for the rare decay {mu} {yields} e{gamma} with a sensitivity of 10{sup {minus}13}. A prime component of this project has been the design and construction of high-rate, low mass MWPCs for the tracking of positrons from muon decay. With rate capabilities of 2 {times} 10{sup 4} e{sup +}/mm{sup 2}/s and a thickness of 3 {times} 10{sup {minus}4} radiation lengths, these chambers are state-… more
Date: January 1, 1991
Creator: Stanislaus, S.; Armijo, V.; Black, J. K.; Bolton, R. D.; Carius, S.; Cooper, M. D. et al.
Partner: UNT Libraries Government Documents Department
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Muon Diffusion in Noble Metals

Description: Diffusion-induced muon depolarization was measured in dilute AgGd and AgEr in the temperature range 200 to 700/sup 0/K and have thereby determined the muon diffusion parameters in Ag. The diffusion parameters for ..mu../sup +/ in Cu, Ag, and Au are compared with those of hydrogen. For Ag and Au, the ..mu../sup +/ parameters are similar to those of hydrogen, whereas for Cu, the ..mu../sup +/ parameters are much smaller. Lattice-activated tunneling and over-barrier hopping are investigated with c… more
Date: January 1, 1982
Creator: Schillaci, M. E.; Boekema, C.; Heffner, R. H.; Hutson, R. L.; Leon, M.; Olsen, C. E. et al.
Partner: UNT Libraries Government Documents Department
open access

Muon spin relaxation in CeCu/sub 2/Si/sub 2/ and muon Knight shift in various heavy-fermion systems

Description: Positive muon spin precession has been observed in varius heavy-fermion systems in the transverse external magnetic field. In the superconductor CeCu/sub 2.1/Si/sub 2/, the relaxation rate of muon spins increases rapidly with decreasing temperature below T/sub c/. This is interpreted as the results of the inhomogeneous fields due to the imperfect penetration of the external field into the type-II superconducting state. The magnetic-field penetration depth lambda is derived from the observed muo… more
Date: January 1, 1986
Creator: Uemura, Y. J.; Kossler, W. J.; Hitti, B.; Kempton, J. R.; Schone, H. E.; Yu, X. H. et al.
Partner: UNT Libraries Government Documents Department
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Surface Underground Coincidences at the Soudan Mine

Description: A 37 m{sup 2} surface array which has been operating in coincidence with the Soudan 1 underground experiment is described. A comparison is made between measured and expected underground-surface coincident events. The surface array is used to tag'' the energy of the cosmic ray primary. Distributions of event rates and multiple muon rates as a function of energy are shown. Expected rates and plans for an enhanced array and for coincidences with Soudan 2 are also discussed. 1 ref., 6 figs.
Date: January 1, 1989
Creator: DasGupta, U.; Ambats, I.; Ayres, D.; Alner, G. J.; Balka, L.; Barr, G. D. et al.
Partner: UNT Libraries Government Documents Department
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Photomultiplier characteristics considerations for the deep underwater muon and neutrino detection system

Description: The results of an investigation of the characteristics of photomultipliers for the Deep Underwater Muon and Neutrino Detection (DUMAND) System are discussed. The pulse-height resolution, the afterpulsing phenomena and the gain sensitivity to the ambient magnetic field have been determined for large photocathode area photomultipliers. Furthermore, the transient time difference, the single photoelectron time spread, and the collection and photocathode quantum efficiency uniformity as a function o… more
Date: February 23, 1980
Creator: Leskovar, B.
Partner: UNT Libraries Government Documents Department
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Muonium to antimuonium conversion and the decay. mu. sup + yields e sup +. nu. sub e. nu. sub. mu. in left-right symmetric models

Description: We investigate muonium to antimuonium conversion and the exotic muon decay {mu}{sup +} {r arrow} e{sup +}{bar {upsilon}}{sub e} {epsilon}{sub {mu}} in SU(2){sub L} {times} SU(2){sub R} {times} U(1){sub B-L} models. 7 refs.
Date: January 1, 1991
Creator: Herczeg, P. (Los Alamos National Lab., NM (United States)) & Mohapatra, R.N. (Maryland Univ., College Park, MD (United States). Dept. of Physics and Astronomy)
Partner: UNT Libraries Government Documents Department
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Search for new effects in e/sup +/e/sup -/ interactions

Description: Recent measurements of R, the ratio of the total hadron cross section to the lowest order muon pair cross section, are discussed which have systematic overall scale errors on the absolute value of R of 7% or less. Experiments are reviewed that have sought exotic effects in e/sup +/e/sup -/ at the highest available energies. The search for narrow states in the radiative decays of the J/psi and UPSILON are also reviewed. 35 refs., 24 figs. (LEW)
Date: May 1, 1985
Creator: Bloom, E.D.
Partner: UNT Libraries Government Documents Department
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Constraints on general SU(2)/sub L/ x SU(2)/sub R/ x U(1) electroweak models from nuclear beta decay

Description: The implications of beta-decay experiments for more general versions of SU(2)/sub L/ x SU(2)/sub R/ x U(1) models are analyzed, including the most general one which allows for CP-violation, unequal left- and right-handed quark mixing angles, and mixing in the leptonic sector. For each scenario, the constraints on the pertinent parameters from beta-decay measurements are compared with the constraints provided on them by other data.
Date: January 1, 1986
Creator: Herczeg, P.
Partner: UNT Libraries Government Documents Department
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Zero-field. mu. SR and low-temperature. mu. /sup +/ diffusivity in copper

Description: In this paper the history of ..mu../sup +/ diffusion studies in copper, with particular emphasis on the increased low-temperature diffusivity which has been known for several years now, is reviewed. The theory and practice of the zero-field ..mu..SR method, which has come into increasing favor in the study of muon diffusion and trapping in metals, is surveyed, and its application to the low-temperature copper problem is discussed. 26 references.
Date: April 1, 1983
Creator: Clawson, C.W.
Partner: UNT Libraries Government Documents Department
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Recent measurements of the B hadron lifetime

Description: Recent measurements of the B hadron lifetime from PEP and PETRA experiments are presented. These measurements firmly establish that the B lifetime is long (approx.1 psec), implying that the mixing between the third generation of quarks and the lighter quarks is much weaker that the mixing between the first two generations.
Date: December 1, 1987
Creator: Ong, R.A.
Partner: UNT Libraries Government Documents Department
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mu. - and tau-pair production from relativistic heavy-ion collisions

Description: The question is addressed of ..mu..- and tau-pair production from the motional Coulomb fields available at the new relativistic heavy-ion accelerators. A semiclassical field theory is developed which is appropriate for families of leptons which are coupled electromagnetically. The field equations are mapped on to a lattice of collocation points using basis spline methods, and techniques for solving the resulting lattice equations are outlined. The properties of the transverse electromagnetic fi… more
Date: January 1, 1986
Creator: Bottcher, C. & Strayer, M. R.
Partner: UNT Libraries Government Documents Department
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D0 papers on B-physics submitted to DPF '96: b-quark inclusive cross sections and b anti-b correlations using dimuons from the D0 experiment; Single muon production in the forward region at [radical]s=1. 8 TEV; Rapidity dependence of the inclusive J[psi] production in the forward region [radical]s=1. 8 TEV; A search for b [r arrow] X[mu][sup +][mu][sup [minus]] and B[sup 0] [r arrow] [mu][sup +][mu][sup [minus]] decays in p anti-p collisions at [radical]s=1. 8 TEV

Description: Paper 1: Using dimuons collected with the D0 detector during the 1993--1995 Tevatron collider run, the authors have measured the b-quark cross section and b[anti b] correlations as given by the difference in azimuthal angle between the two muons. Both measurements agree with the NLO QCD predictions within experimental and theoretical errors. (Three other papers are included in this report.)
Date: November 1, 1996
Creator: Vititoe, D.L. (Arizona Univ., Tucson, AZ (United States). Dept. of Physics); Kozelov, Alexander; Jesik, Richard & Collaboration., D0
Partner: UNT Libraries Government Documents Department
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Study of rare muon decay modes with the crystal box

Description: We report on a search for the lepton family-number-nonconserving decays ..mu../sup +/..-->..e/sup +/e/sup -/e/sup +/, ..mu../sup +/..-->..e/sup +/..gamma.., and ..mu../sup +/..-->..e/sup +/..gamma gamma.., using the Crystal Box detector at LAMPF. The experiment was run in the stopped muon channel at LAMPF during the winter and summer of 1984. Muons were stopped in the middle of a detector system consisting of a cylindrical drift chamber, a plastic scintillator hodoscope, and a segmented array o… more
Date: January 1, 1985
Creator: Sandberg, V.; Bolton, R. D.; Bowman, J. D.; Carlini, R. D.; Copper, M. D.; Doung-Van, M. et al.
Partner: UNT Libraries Government Documents Department
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