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DETERMINING THE RATIO OF THE H+ YIELDS TV TO H+ YIELDS TB DECAY RATES FOR LARGE TAN BETA AT THE LARGE HADRON COLLIDER.
We present results on the determination of the observable ratio R = BR(H{sup +} {yields} {tau}{sup +}{nu}{sup -})/BR(H{sup +} {yields} t{bar b}) of charged Higgs boson decay rates as a discriminant quantity between Supersymmetric and non-Supersymmetric models. Simulation of measurements of this quantity through the analysis of the charged Higgs production process gb {yields} tbH{sup +} and relative backgrounds in the two above decay channels has been performed in the context of ATLAS. A {approx} 12-14% accuracy on R can be achieved for tan {beta} = 50, m{sub H{sup {+-}}} = 300-500 GeV and after an integrated luminosity of 300 fb{sup -1}. With this precision measurement, the Large Hadron Collider (LHC) can easily discriminate between models for the two above scenarios, so long as tan {beta} > 20.
Date:
May 27, 2003
Creator:
ASSAMAGAN,K. A. GUASCH,J. MORETTI,S. PENARANDA,S.
Object Type:
Article
System:
The UNT Digital Library
LSST data pipeline prototyping plans and strategy
In this document we describe our approach and strategy for building the prototype for the image-stream analysis data pipeline. We start by describing the main research areas upon which we will be focusing; we then describe our plans on how to carry these research ideas to implement the data pipeline.
Date:
May 27, 2004
Creator:
Abdulla, G. M.; Brase, J.; Cook, K. & Miller, M.
Object Type:
Report
System:
The UNT Digital Library
U.S. - European Union Disputes in the World Trade Organization
This report discusses disputes in the World Trade Organization (WTO) between the United States and the European Union (EU). The report begins with an overview of the issues to be addressed, and continues with a brief description of the WTO dispute settlement process, a summary of U.S.-EU dispute settlement history, and a review of issues arising from cases of longstanding non-compliance. The report concludes with a discussion of continuing concerns and policy considerations.
Date:
May 27, 2003
Creator:
Ahearn, Raymond J. & Grimmett, Jeanne J.
Object Type:
Report
System:
The UNT Digital Library
Bifurcations and Patterns in Nonlinear Dissipative Systems
This project consists of experimental investigations of heat transport, pattern formation, and bifurcation phenomena in non-linear non-equilibrium fluid-mechanical systems. These issues are studies in Rayleigh-B\'enard convection, using both pure and multicomponent fluids. They are of fundamental scientific interest, but also play an important role in engineering, materials science, ecology, meteorology, geophysics, and astrophysics. For instance, various forms of convection are important in such diverse phenomena as crystal growth from a melt with or without impurities, energy production in solar ponds, flow in the earth's mantle and outer core, geo-thermal stratifications, and various oceanographic and atmospheric phenomena. Our work utilizes computer-enhanced shadowgraph imaging of flow patterns, sophisticated digital image analysis, and high-resolution heat transport measurements.
Date:
May 27, 2005
Creator:
Ahlers, Guenter
Object Type:
Report
System:
The UNT Digital Library
Storage capacity for fissile material as a function of facility shape (room length-to-width ratio)
None
Date:
May 27, 1975
Creator:
Altschuler, S. J.
Object Type:
Report
System:
The UNT Digital Library
Diffractive results from the Tevatron
Hard diffraction in events with dijets and rapidity gaps has been studied by D0 and CDF for three processes: hard color singlet exchange, hard single diffraction, and hard double pomeron exchange, using Tevatron {anti p}p data at {radical}s = 630 GeV and 1.8 TeV. Measurements of rates, {eta}, E{sub T} and {radical}s dependencies are presented and comparisons made with predictions of several models.
Date:
May 27, 1999
Creator:
Alves, Gilvan A.
Object Type:
Article
System:
The UNT Digital Library
The fractal nature of vacuum arc cathode spots
Cathode spot phenomena show many features of fractals, for example self-similar patterns in the emitted light and arc erosion traces. Although there have been hints on the fractal nature of cathode spots in the literature, the fractal approach to spot interpretation is underutilized. In this work, a brief review of spot properties is given, touching the differences between spot type 1 (on cathodes surfaces with dielectric layers) and spot type 2 (on metallic, clean surfaces) as well as the known spot fragment or cell structure. The basic properties of self-similarity, power laws, random colored noise, and fractals are introduced. Several points of evidence for the fractal nature of spots are provided. Specifically power laws are identified as signature of fractal properties, such as spectral power of noisy arc parameters (ion current, arc voltage, etc) obtained by fast Fourier transform. It is shown that fractal properties can be observed down to the cutoff by measurement resolution or occurrence of elementary steps in physical processes. Random walk models of cathode spot motion are well established: they go asymptotically to Brownian motion for infinitesimal step width. The power spectrum of the arc voltage noise falls as 1/f {sup 2}, where f is frequency, …
Date:
May 27, 2005
Creator:
Anders, Andre
Object Type:
Article
System:
The UNT Digital Library
Strange-Particle Production by 1170-MeV/c pi- Mesons
Production of {Lambda} + K{sup 0}, {Sigma}{sup 0} + K{sup 0}, and {Sigma}{sup -} + K{sup +} by 1170-MeV/c {pi}{sup -} mesons has been studied in the Lawrence Radiation Laboratory 72-inch hydrogen bubble chamber, Cross sections, angular distributions, and polarizations are presented. The polarization of the {Sigma}{sup 0} is determined at four center-of-mass angles and found to be small everywhere. Based on published results for the reaction {pi}{sup +} + p {yields} {Sigma}{sup +}, K{sup +}, a comparison of the polarizations of {Sigma}{sup +}, {Sigma}{sup -}, and {Sigma}{sup 0} is made from the charge-independence triangle. A conclusion is reached that the {Sigma}{sup -} polarization should be large, and that the {Sigma}{sup -} and {Sigma}{sup +} polarizations should be opposite in sign.
Date:
May 27, 1963
Creator:
Anderson, Jared Arnold
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Distribution of Thermal Neutrons from Fast Sources in Exponential Piles
Report regarding the mathematical analysis of the exponential pile experiment using highly absorbent slugs and assuming the emitting of fast neutrons. Related theory and equations are discussed.
Date:
May 27, 1954
Creator:
Anselone, Philip M.
Object Type:
Report
System:
The UNT Digital Library
Proposal of the Next Incarnation of Accelerator Test Facility at KEK for the International Linear Collider
To reach design luminosity, the International Linear Collider (ILC) must be able to create and reliably maintain nanometer size beams. The ATF damping ring is the unique facility where ILC emittances are possible. In this paper we present and evaluate the proposal to create a final focus facility at the ATF which, using compact final focus optics and an ILC-like bunch train, would be capable of achieving 37 nm beam size. Such a facility would enable the development of beam diagnostics and tuning methods, as well as the training of young accelerator physicists.
Date:
May 27, 2005
Creator:
Araki, S.; Hayano, H.; Higashi, Y.; Honda, Y.; Kanazawa, K.; Kubo, K. et al.
Object Type:
Article
System:
The UNT Digital Library
European Union’s Arms Embargo on China: Implications and Options for U.S. Policy
Overall, there are two sets of questions for Congress in examining U.S. policy toward the fate of the EU’s arms embargo on China. What are the implications for U.S. interests in trans-Atlantic relations and China? If U.S. interests are adversely affected, what are some options for Congress to discourage the EU from lifting its arms embargo on China and, if it is lifted, to protect U.S. national security interests in both Asia and Europe? Issues raised by these questions are the subject of this CRS Report.
Date:
May 27, 2005
Creator:
Archick, Kristin; Grimmett, Richard F. & Kan, Shirley A.
Object Type:
Report
System:
The UNT Digital Library
Morocco: Current Issues
This report discusses the current political and foreign policy status of Morocco, especially with regard to its relationship with the United States and its struggles combating terrorism.
Date:
May 27, 2011
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
Turbulence-Flame Interactions in Type Ia Supernovae
The large range of time and length scales involved in type Ia supernovae (SN Ia) requires the use of flame models. As a prelude to exploring various options for flame models, we consider, in this paper, high-resolution three-dimensional simulations of the small-scale dynamics of nuclear flames in the supernova environment in which the details of the flame structure are fully resolved. The range of densities examined, 1 to 8 x 107 g cm-3, spans the transition from the laminar flamelet regime to the distributed burning regime where small scale turbulence disrupts the flame. The use of a low Mach number algorithm facilitates the accurate resolution of the thermal structure of the flame and the inviscid turbulent kinetic energy cascade, while implicitly incorporating kinetic energy dissipation at the grid-scale cutoff. For an assumed background of isotropic Kolmogorov turbulence with an energy characteristic of SN Ia, we find a transition density between 1 and 3 x 107 g cm-3 where the nature of the burning changes ualitatively. By 1 x 107 g cm-3, energy diffusion by conduction and radiation is exceeded, on the flame scale, by turbulent advection. As a result, the effective Lewis Number approaches unity. That is, the flame resembles …
Date:
May 27, 2008
Creator:
Aspden, Andrew J.; Bell, John B.; Day, Marc S.; Woosley, Stan E. & Zingale, Mike
Object Type:
Article
System:
The UNT Digital Library
Search for b->u Transitions inB- -> D0 K- and B- -> D*0 K-
The authors search for B{sup -} {yields} {tilde D}{sup 0}K{sup -} and B{sup -} {yields} {tilde D}*{sup 0}K{sup -}, with {tilde D}*{sup 0} {yields} {tilde D}{sup 0}{pi}{sup 0} or {tilde D}*{sup 0} {yields} {tilde D}{sup 0}{gamma}, and {tilde D}{sup 0} {yields} K{sup +}{pi}{sup -} (and charge conjugates). These final states can be reached through the b {yields} c transition B{sup -} {yields} D{sup (*)0}K{sup -} followed by the doubly CKM-suppressed D{sup 0} {yields} K{sup +}{pi}{sup -}, or the b {yields} u transition B{sup -} {yields} {bar D}{sup (*)0}K{sup -} followed by the CKM-favored {bar D}{sup 0} {yields} K{sup +}{pi}{sup -}. The interference of these two amplitudes is sensitive to the angle {gamma} of the unitarity triangle. The results are based on 232 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at SLAC. They find no significant evidence for these decays. They set a limit r{sub B} {triple_bond} |A(B{sup -} {yields} {bar D}{sup 0}K{sup -})/A(B{sup -} {yields} D{sup 0}K{sup -})| < 0.23 at 90% C.L. using the most conservative assumptions on the values of the CKM angle {gamma} and the strong phases in the B and D decay amplitudes. In the case of the D* they set a …
Date:
May 27, 2005
Creator:
Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J. P. et al.
Object Type:
Article
System:
The UNT Digital Library
Human events reference for ATHEANA (HERA) database description and preliminary user`s manual
The Technique for Human Error Analysis (ATHEANA) is a newly developed human reliability analysis (HRA) methodology that aims to facilitate better representation and integration of human performance into probabilistic risk assessment (PRA) modeling and quantification by analyzing risk-significant operating experience in the context of existing behavioral science models. The fundamental premise of ATHEANA is that error-forcing contexts (EFCs), which refer to combinations of equipment/material conditions and performance shaping factors (PSFs), set up or create the conditions under which unsafe actions (UAs) can occur. Because ATHEANA relies heavily on the analysis of operational events that have already occurred as a mechanism for generating creative thinking about possible EFCs, a database, called the Human Events Reference for ATHEANA (HERA), has been developed to support the methodology. This report documents the initial development efforts for HERA.
Date:
May 27, 1998
Creator:
Auflick, J.L.; Hahn, H.A. & Pond, D.J.
Object Type:
Report
System:
The UNT Digital Library
Prospects for Advances in Energy Conversion Technologies for Geothermal Energy Development
None
Date:
May 27, 1975
Creator:
Austin, A. L.
Object Type:
Article
System:
The UNT Digital Library
An efficient parallel termination detection algorithm
Information local to any one processor is insufficient to monitor the overall progress of most distributed computations. Typically, a second distributed computation for detecting termination of the main computation is necessary. In order to be a useful computational tool, the termination detection routine must operate concurrently with the main computation, adding minimal overhead, and it must promptly and correctly detect termination when it occurs. In this paper, we present a new algorithm for detecting the termination of a parallel computation on distributed-memory MIMD computers that satisfies all of those criteria. A variety of termination detection algorithms have been devised. Of these, the algorithm presented by Sinha, Kale, and Ramkumar (henceforth, the SKR algorithm) is unique in its ability to adapt to the load conditions of the system on which it runs, thereby minimizing the impact of termination detection on performance. Because their algorithm also detects termination quickly, we consider it to be the most efficient practical algorithm presently available. The termination detection algorithm presented here was developed for use in the PMESC programming library for distributed-memory MIMD computers. Like the SKR algorithm, our algorithm adapts to system loads and imposes little overhead. Also like the SKR algorithm, ours is tree-based, …
Date:
May 27, 2004
Creator:
Baker, A H; Crivelli, S & Jessup, E R
Object Type:
Article
System:
The UNT Digital Library
Dark Currents and Their Effect on the Primary Beam in an X-band Linac
We numerically study properties of primary dark currents in an X-band accelerating structure. For the H60VG3 structure considered for the Next Linear Collider (NLC) we first perform a fairly complete (with some approximations) calculation of dark current trajectories. These results are used to study properties of the dark current leaving the structure. For example, at accelerating gradient of 65 MV/m, considering two very different assumptions about dark current emission around the irises, we find that the fraction of emitted current leaving the structure to be a consistent {approx} 1%. Considering that {approx} 1 mA outgoing dark current is seen in measurement, this implies that {approx} 100 mA (or 10 pC per period) is emitted within the structure itself. Using the formalism of the Lienard-Wiechert potentials, we then perform a systematic calculation of the transverse kick of dark currents on a primary linac bunch. The result is {approx} 1 V kick per mA (or per 0.1 pC per period) dark current emitted from an iris. For an entire structure we estimate the total kick on a primary bunch to be {approx} 15 V. For the NLC linac this translates to a ratio of (final) vertical beam offset to beam size of …
Date:
May 27, 2005
Creator:
Bane, K .L. F.; Dolgashev, V. A.; Raubenheimer, Tor; Stupakov, G. V. & Wu, J. H.
Object Type:
Article
System:
The UNT Digital Library
Damping beam displacements through phase mixing: an illustrative model
We develop a simple model of a beam transported in a hard wall channel (an idealized very-high-order magnetic-multipole channel). The extremely anharmonic nature of the potential leads to damping of coherent transverse displacements of the beam via phase mixing. For the case of small uniform displacements of the beam we can write down by inspection the analytical form of the motion of the beam centroid. The same technique allows us to evaluate the effects of focussing and scattering elements in the transport channel upon the damping of the transverse motion of the beam.
Date:
May 27, 1983
Creator:
Barletta, W. A. & Briggs, R. J.
Object Type:
Article
System:
The UNT Digital Library
Analysis of Positron Collection in the Linear Collider
In the Linear Collider, the positron capture system includes a positron production target, an adiabatic matching device (AMD), and a linac to accelerate positrons up to the injection energy of the positron damping ring. Efficiency of the positron collector is defined by the number of positrons accepted into the damping ring. Analysis of the positron collection system is performed using a conventional scheme, where positrons are produced by a high-energy electron beam hitting the high-Z target. The collection system has been optimized to insure high positron capture into the 6-dimensional acceptance of the damping ring. Various parameters affecting the positron capture are analyzed.
Date:
May 27, 2005
Creator:
Batygin, Yuri K.af SLAC
Object Type:
Article
System:
The UNT Digital Library
The Constitution of Zirconium-Uranium Alloys Containing Oxygen or Nitrogen
This report addresses the constitution of zirconium-uranium alloys containing oxygen or nitrogen.
Date:
May 27, 1957
Creator:
Bauer, Arthur A.; Beatty, Glen H.; Rough, Frank A. & Dickerson, Ronald F.
Object Type:
Report
System:
The UNT Digital Library
Tennessee Emergency Management and Homeland Security Statutory Authorities Summarized
This report is one of a series that profiles the emergency management and homeland security statutory authorities of the 50 states, the District of Columbia, the Commonwealth of the Northern Mariana Islands, the Commonwealth of Puerto Rico, and three territories (American Samoa, Guam, and the U.S. Virgin Islands). Each profile identifies the more significant elements of state statutes, generally as codified. This report focuses on the state of Tennessee.
Date:
May 27, 2004
Creator:
Bea, Keith; Runyon, L. Cheryl & Warnock, Kae M.
Object Type:
Report
System:
The UNT Digital Library
Texas Emergency Management and Homeland Security Statutory Authorities Summarized
This report is one of a series that profiles the emergency management and homeland security statutory authorities of the 50 states, the District of Columbia, the Commonwealth of the Northern Mariana Islands, the Commonwealth of Puerto Rico, and three territories (American Samoa, Guam, and the U.S. Virgin Islands). Each profile identifies the more significant elements of state statutes, generally as codified. This report focuses on the state of Texas.
Date:
May 27, 2004
Creator:
Bea, Keith; Runyon, L. Cheryl & Warnock, Kae M.
Object Type:
Report
System:
The UNT Digital Library
Utah Emergency Management and Homeland Security Statutory Authorities Summarized
This report is one of a series that profiles the emergency management and homeland security statutory authorities of the 50 states, the District of Columbia, the Commonwealth of the Northern Mariana Islands, the Commonwealth of Puerto Rico, and three territories (American Samoa, Guam, and the U.S. Virgin Islands). Each profile identifies the more significant elements of state statutes, generally as codified. This report focuses on the state of Utah.
Date:
May 27, 2004
Creator:
Bea, Keith; Runyon, L. Cheryl & Warnock, Kae M.
Object Type:
Report
System:
The UNT Digital Library