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Gamma rays from Cygnus X-1: Modeling and nonthermal pair production

Description: The gamma-ray bump observed between 0.5 and 2 MeV in the spectrum of Cygnus X-1 can be interpreted as the thermal emissions from a hot (kT)approximately)400 keV) pair-dominated cloud. We argue that the X-rays and gamma rays are produced in separate emission regions, and calculate the photon-photon pair production rate from X-ray and gamma-ray interactions in the vicinity of Cyg X-1 by employing a simplified geometry for the two emitting regions.
Date: February 1, 1988
Creator: Dermer, C. D. & Liang, E. P.
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Partner: UNT Libraries Government Documents Department
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Beauty physics at the ultrahigh energies of the ELOISATRON (Euroasiatic Long Intersecting Superconducting Accelerator Synchrotron)

Description: The potential for experimentally studying B physics at the proposed INFN 100 TeV ELOISATRON (Euroasiatic Long Intersecting Superconducting Accelerator Synchrotron) is compared with possibilities at 40 TeV at the Superconducting Super Collider. The effect of the increase in center of mass energy on the production and decay of B mesons has been investigated, particularly with respect to the accummulation of large samples of B hadron decays necessary for the detection of CP violating effects. 13 r… more
Date: February 1, 1988
Creator: Cox, B.
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Partner: UNT Libraries Government Documents Department
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Proposal to the Department of Energy for participation in the UA1 experiment

Description: This proposal is to the Department of Energy for 501.6K dollars (349.6K operations and 152K equipment) for continued participation in the UA1 experiment on proton-antiproton collisions. The UA1 experiment is the study of high-energy proton-antiproton collisions in the Super-Proton-synchrotron (SPS) Collider at CERN. A major upgrade of the UA1 detector is in progress for operation with the upgraded antiproton source (ACOL). The US groups have played an increasingly prominent role in UA1 during t… more
Date: February 1, 1988
Creator: Rohlf, J.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Research at LAMPF

Description: During the past decade, both the science program and the experimental facilities at LAMPF have undergone some significant changes. This report is a concise description of the current research initiatives and of new directions being proposed for the future research program at LAMPF. Traditionally the LAMPF physics program has explored nuclear systems with hadronic probes: pions, protons, and neutrons. In recent years the exploitation of the intense lepton beams -- neutrinos and muons -- at LAMPF… more
Date: February 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Z yields jets+. gamma. as a signal for R-parity violation

Description: Supersymmetric models with explicit R-parity violation can induce new rare decay modes of the Z boson into single supersymmetric particles. Here, the rate and signature for one such decay, Z {yields} {tilde {upsilon}} {gamma}, is examined, where it is found that the rate is at least an order of magnitude smaller than that for the process Z{yields} H{gamma}, even with larger values of the R-parity violating couplings.
Date: February 1, 1992
Creator: Hewett, J.L.
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Partner: UNT Libraries Government Documents Department
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Inverse phase transitions: Does baryogenesis lead to dark matter

Description: The phase structure of a field theory can have two qualitatively different forms- the less familiar of which involves high temperature symmetry breaking and low temperature symmetry restoration and is dubbed an inverse phase transition. After a general discussion of such inverse phase transitions we present an application of this phenomenon in which the symmetry under consideration is baryon number. The model has the virtues of generating the observed quark-antiquark asymmetry (with no explicit… more
Date: February 1, 1992
Creator: Dodelson, S. (Fermi National Accelerator Lab., Batavia, IL (United States)); Greene, B.R. (Cornell Univ., Ithaca, NY (United States). Newman Lab. of Nuclear Studies) & Widrow, L.M. (Toronto Univ., ON (Canada). Canadian Inst. for Theoretical Astrophysics)
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Partner: UNT Libraries Government Documents Department
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Mechanism of light-particle emission

Description: A general overview of the field of high-energy nuclear collisions studied from light particle spectra, pions, kaons, lambdas, protons, deuterons, and light composite fragments is given. Specifically, the basic reaction mechanism that determines the main features of particle emission such as the energy and angular distributions, the multiplicity, the production rate, the projectile and target mass dependences, the beam-energy dependences, etc. are discussed. Very general features of high-energy … more
Date: February 1, 1982
Creator: Nagamiya, S.
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Partner: UNT Libraries Government Documents Department
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Antiproton physics in the next decade

Description: Notes from a talk at the LAMPF II workshop are given. Topics include antinucleon physics in the next decade - the role of anti p and anti n beams in shedding light on some fundamental problems in nuclear and particle physics. Some particle aspects considered include; a) anti n as a source of antiquarks (anti NN provides a well-suited entrance channel for formation of new kind of mesons), and b) possibility of forming quark-gluon phase in anti N annihilations in nuclei. Some nuclear aspects disc… more
Date: February 1, 1982
Creator: Dover, C. B.
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Partner: UNT Libraries Government Documents Department
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Total pion cross section measurements. Annual progress report, January 1, 1979-December 31, 1979

Description: The principal effort has been devoted to the data analysis for the pion-nucleus total cross section experiment. Forward scattering amplitudes have been obtained for ..pi..+- mesons on Al, /sup 40/Ca, Cu, Sn, Ho, and Pb. These results are given. Work is continuing on the data reduction for the remaining targets.
Date: February 8, 1980
Creator: Jakobson, M. J. & Jeppesen, R. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Some exact results for the two-point function of an integrable quantum field theory

Description: The two point correlation function for the quantum nonlinear Schroedinger (delta-function gas) model is studied. An infinite series representation for this function is derived using the quantum inverse scattering formalism. For the case of zero temperature, the infinite coupling (c ..-->.. infinity) result of Jimbo, Miwa, Mori and Sato is extended to give an exact expression for the order 1/c correction to the two point function in terms of a Painleve transcendent of the fifth kind.
Date: February 1, 1981
Creator: Creamer, D.B.; Thacker, H.B. & Wilkinson, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Multiplicity distributions in hadron-hadron collisions based on the universality ansatz

Description: Recent experiments on small-p/sub T/ hadron production in pp collisions have shed new light on the apparent violation of the universality ansatz that the multiplicity dispersion in hadron-hadron collisions is much larger than that in e/sup +/e/sup -/ collisions. We present a model based on the universality ansatz, among other things. This model reproduces qualitatively the hadron multiplicity distributions in pp collisions over a wide range of energies. Within our framework, this essentially re… more
Date: February 1, 1982
Creator: Chiu, C. B. & Xie, Q.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The 17 keV neutrino and neutrino tagging

Description: P-788 at FNAL proposed to search for neutrino oscillations in a tagged neutrino line. A K{sub L} beam and the decay modes K{sub L} {yields} {pi}{mu}{nu}{sub {mu}} and K {sub L} {yields} {pi}e{nu}{sub e} provides the neutrino flux. An upstream tagging spectrometer then identifies the hadron and lepton and reconstructs the K{sub L} decay; the lepton identification will specifies the neutrino as {nu}{sub e} or {nu}{sub {mu}} and distinguishes {nu} from {bar {nu}} at the decay vertex. A neutrino de… more
Date: February 1, 1992
Creator: Bernstein, R.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Possibilities for experiments with deuteron and light-ion beams at 4 < E/sub Beam//A < 10 GeV

Description: This note describes possibilities for experiments with deuterons and light ions at beam energies greater than a few GeV per nucleon. In the low energy region (below a few GeV per nucleon) dominant secondaries created in nuclear collisions are ..delta..'s and pions. The first interesting possibility at higher beam energies is therefore the study of strange particle spectroscopy. The second possibility is related to the creation of high density. In the low energy region the creation of a high den… more
Date: February 1, 1982
Creator: Nagamiya, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Beyond the supersymmetric standard model

Description: The possibility of baryon number violation at the weak scale and an alternative primordial nucleosynthesis scheme arising from the decay of gravitations are discussed. The minimal low energy supergravity model is defined and a few of its features are described. Renormalization group scaling and flavor physics are mentioned.
Date: February 1, 1988
Creator: Hall, L.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Particel substructure. A common theme of discovery in this century

Description: Some example of modern developments in particel physics are given which demonstrate that the fundamental rules of quantum mechanics, applied to all forces in nature as they became understood, have retained their validity. The well-established laws of electricity and magnetism, reformulated in terms of quantum mechanics, have exhibited a truly remarkable numerical agreement between theory and experiment over an enormous range of observation. As experimental techniques have grown from the top of … more
Date: February 1, 1984
Creator: Panofsky, W.K.H.
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Partner: UNT Libraries Government Documents Department
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Hunt for the 1/sup 1/P/sub 1/ bound state of charmonium

Description: Using the Crystal Ball detector at SPEAR, we have looked for evidence of the isospin-violating decay psi' ..-->.. ..pi../sup 01/P/sub 1/, where /sup 1/P/sub 1/ is the predicted spin-singlet p-wave bound state of charmonium. For a /sup 1/P/sub 1/ state at the predicted mass (approx. 3520 MeV), we obtain the 95% confidence level limits: BR(psi' ..-->.. ..pi../sup 01/P/sub 1/) < 0.55%, BR(psi' ..-->.. ..pi../sup 01/P/sub 1/)BR(/sup 1/P/sub 1/ ..-->.. ..gamma..n/sub c/ < 0.14%. These limits are com… more
Date: February 1, 1982
Creator: Porter, Frank C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Monte Carlo simulations of lattice gauge theories

Description: Monte Carlo simulations done for four-dimensional lattice gauge systems are described, where the gauge group is one of the following: U(1); SU(2); Z/sub N/, i.e., the subgroup of U(1) consisting of the elements e 2..pi..in/N with integer n and N; the eight-element group of quaternions, Q; the 24- and 48-element subgroups of SU(2), denoted by T and O, which reduce to the rotation groups of the tetrahedron and the octahedron when their centers Z/sub 2/, are factored out. All of these groups can b… more
Date: February 1, 1980
Creator: Rebbi, C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Invariance, symmetry and periodicity in gauge theories

Description: The interplay between gauge transformations and coordinate transformations is discussed; the theory will aid in understanding the mixing of space-time and internal degrees of freedom. The subject is presented under the following headings: coordinate transformation laws for arbitrary fields, coordinate transformation laws for gauge fields, properties of symmetric gauge fields, construction of symmetric gauge fields, physical significance of gauge transformations, and magnetic monopole topology w… more
Date: February 1, 1980
Creator: Jackiw, R.
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Partner: UNT Libraries Government Documents Department
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Low energy p p physics

Description: A detailed investigation of proton-antiproton interactions at low energy has become feasible with the commissioning of the LEAR facility in 1983. We shall shortly review the status of {bar p}p annihilation at rest and the physics motivations for second generation experiments with the Crystal Barrel detector. This type of detector would be adequate for the study of both Kp and {bar p}p interactions on an extracted beam of the KAON Factory. We shall conclude with a few remarks on the physics oppo… more
Date: February 1, 1989
Creator: Amsler, C.; Crowe, K. (Zurich Univ. (Switzerland). Inst. fuer Physik & Lawrence Berkeley Lab., CA (USA))
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Partner: UNT Libraries Government Documents Department
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Gluon Bremstrahlung Effects in Large P/sub perpendicular/ Hadron-Hadron Scattering

Description: We consider effects of parton (primarily gluon) bremstrahlung in the initial and final states of high transverse momentum hadron-hadron scattering. Monte Carlo calculations based on conventional QCD parton branching and scattering processes are presented. The calculations are carried only to the parton level in the final state. We apply the model to the Drell-Yan process and to high transverse momentum hadron-hadron scattering triggered with a large aperture calorimeter. We show that the latter… more
Date: February 1, 1982
Creator: Fox, G. C. & Kelly, R. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The multistring model VENUS for ultrarelativistic heavy ion collisions

Description: The event generator VENUS is based on a multistring model for heavy ion collisions at ultrarelativistic energies. The model is a straightforward extension of a successful model for soft proton-proton scattering, the latter one being consistent with e/sup )plus/)e/sup )minus/) annihilation and deep inelastic lepton scattering. Comparisons of VENUS results with pA and recent AA data alow some statements about intranuclear cascading. 18 refs., 7 figs
Date: February 1, 1988
Creator: Werner, K.
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Partner: UNT Libraries Government Documents Department
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Current puzzles and future possibilities

Description: Four current puzzles and several future experimental possibilities in high-energy nuclear collision research are discussed. These puzzles are (1) entropy, (2) hydrodynamic flow, (3) anomalon, and (4) particle emission at backward angles in proton-nucleus collisions. The last one seems not to be directly related to the subject of the present school. But it is, because particle emission into the region far beyond the nucleon-nucleon kinematical limit is an interesting subject common for both prot… more
Date: February 1, 1982
Creator: Nagamiya, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Inelastic Strong Interactions at High Energies. Annual Progress Report, June 1, 1979-May 1, 1980. [Univ. Of Cincinnati, 6/1/79-5/1/80]

Description: Investigations in the area of Grand Unified Field Theories were begun. Various ways of breaking the SU(5) symmetric theory of Georgi and Glashow were studied. As usual, an approx. 24 of Higgs breaks the symmetry from SU(5) to SU(3)/sub c/xSU(2)xU(1). It was found that an approx. 45 of Higgs is acceptable for breaking the symmetry from SU(3)/sub c/xSU(2)xU(1) to SU(3)/sub c/xU(1)/sub em/. In addition phenomenologically correct quark-lepton mass ratios are obtained by use of renormalization-group… more
Date: February 1, 1980
Creator: Suranyi, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High Energy Physics Division semiannual report of research activities, July 1, 1990--December 31, 1990

Description: A report is presented of research and development activities conducted in the High Energy Physics Division at Argonne National Laboratory during the six month period July 1 through December 31, 1990. Analyses of data from experiments performed by members of the Division are summarized, and the status of experiments taking data and of those being prepared is reviewed. Descriptions are included of research on theoretical and phenomenological topics in particle physics. Progress reports are provid… more
Date: February 1, 1991
Creator: Berger, E.; Moonier, P.; May, E. & Norem, J. (eds.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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