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Simulation of Hypervelocity Penetration in Limestone
A parameter study was performed to examine the (shock) damage obtained with long-rod and spherical mono-material penetrators impacting two varieties of limestone. In all cases, the impacts were assumed to be normal to the plane of the rock and at zero angle of attack (in the case of the rods). Impact velocities ranged to 15 km/s but most calculations were performed at 4 and 6 km/s and the penetrator mass was fixed at 1000 kg. For unlined underground structures, incipient damage was defined to occur when the peak stress, {sigma}{sub pk}, exceeds 1 kb (100 MPa) and the applied impulse per unit area, I{sub pk}, exceeds 1 ktap (1 kb-{micro}s). Severe damage was assumed to occur when {sigma}{sub pk} exceeds 1 kb and I{sub pk} exceeds 1000 ktaps. Using the latter definition it was found that severe damage in hard, non-porous limestone with spherical impactors extended to a depth of 9 m on-axis for an impact velocity of 4 km/s and 12 m at 6 km/s. Cylinders with length-to-diameter (L/D) ratio of 8.75 achieved depth to severe damage of 23 m and 40 m, respectively under the same conditions. For a limestone medium with 2% initial gas porosity, the latter …
Date:
May 31, 2005
Creator:
Antoun, T; Glenn, L; Walton, O; Goldstein, P; Lomov, I & Liu, B
Object Type:
Article
System:
The UNT Digital Library
Declaration Patent for the Invention of Device for Pulling Halyard
The device for the halyard stretching consists of a frame with coupler and clamping rollers mounted in pairs on it, the drive of the rotation of the coupler rollers and the clamping device with a clamping spring. The clamping device is remarkable that the clamping rollers are mounted in a separate movable bracket, which is connected with the frame with the help of a hinge. Between the frame and the movable bracket a releasing spring is inserted. The clamping device is equipped with a movable holder to clamp rollers kinematically connected with the coupler ones with the aid of cardan joints. It assures rotations of the movable bracket over the frame and synchronous rotation of the coupler and clamping rollers ill different directions. All rollers are connected with the drive of rotation via an electro magnet sleeve. A linear drive of spring pressing is mounted between the movable bracket and the clamping spring. A nip of the releasing spring is connected with the electromagnet rotor.
Date:
January 31, 2002
Creator:
Anuprienko, G. E.; Karpachov, Y. A.; Rowland, M. S.; Savenko, Y. M. & Smith, C. F.
Object Type:
Report
System:
The UNT Digital Library
Spin coherence transfer in chemical transformations monitoredNMR
We demonstrate the use of micro-scale nuclear magneticresonance (NMR) for studying the transfer of spin coherence innon-equilibrium chemical processes, using spatially separated NMRencoding and detection coils. As an example, we provide the map ofchemical shift correlations for the amino acid alanine as it transitionsfrom the zwitterionic to the anionic form. Our method is unique in thesense that it allows us to track the chemical migration of encodednuclear spins during the course of chemical transformations.
Date:
July 31, 2006
Creator:
Anwar, Sabieh M.; Hilty, Christian; Chu, Chester; Bouchard,Louis-S.; Pierce, Kimberly L. & Pines, Alexander
Object Type:
Article
System:
The UNT Digital Library
Individuals with Disabilities Education Act (IDEA) and Medicaid
This report begins with an overview of Individuals with Disabilities Education Act (IDEA). It then discusses the distinction made in IDEA between medical services and health services. The report then summarizes the provisions in law that link Medicaid funding to IDEA. Next the report provides an overview of the complexities of Medicaid eligibility and covered services. Following that discussion, the report analyzes possible reasons why Medicaid appears to cover relatively little of IDEA health-related costs. Finally the report outlines possible legislative approaches with respect to Medicaid and IDEA.
Date:
January 31, 2003
Creator:
Apling, Richard N. & Herz, Elicia J.
Object Type:
Report
System:
The UNT Digital Library
The Individuals with Disabilities Education Act (IDEA): Overview and Selected Issues
This report provides a brief overview of the act with particular attention paid to issues of recent congressional concern, such as funding and private school enrollment.
Date:
January 31, 2007
Creator:
Apling, Richard N. & Jones, Nancy Lee
Object Type:
Report
System:
The UNT Digital Library
Hazardous Waste Code Determination for First/Second-Stage Sludge Waste Stream (IDCs 001, 002, 800)
This document, Hazardous Waste Code Determination for the First/Second-Stage Sludge Waste Stream, summarizes the efforts performed at the Idaho National Engineering and Environmental Laboratory (INEEL) to make a hazardous waste code determination on Item Description Codes (IDCs) 001, 002, and 800 drums. This characterization effort included a thorough review of acceptable knowledge (AK), physical characterization, waste form sampling, chemical analyses, and headspace gas data. This effort included an assessment of pre-Waste Analysis Plan (WAP) solidified sampling and analysis data (referred to as preliminary data). Seventy-five First/Second-Stage Sludge Drums, provided in Table 1-1, have been subjected to core sampling and analysis using the requirements defined in the Quality Assurance Program Plan (QAPP). Based on WAP defined statistical reduction, of preliminary data, a sample size of five was calculated. That is, five additional drums should be core sampled and analyzed. A total of seven drums were sampled, analyzed, and validated in compliance with the WAP criteria. The pre-WAP data (taken under the QAPP) correlated very well with the WAP compliant drum data. As a result, no additional sampling is required. Based upon the information summarized in this document, an accurate hazardous waste determination has been made for the First/Second-Stage Sludge Waste Stream.
Date:
January 31, 2001
Creator:
Arbon, R.E.
Object Type:
Report
System:
The UNT Digital Library
Advanced Building Efficiency Testbed Initiative/Intelligent Workplace Energy Supply System; ABETI/IWESS
ABETI/IWESS is a project carried out by Carnegie Mellon's Center for Building Performance and Diagnostics, the CBPD, supported by the U.S. Department of Energy/EERE, to design, procure, install, operate, and evaluate an energy supply system, an ESS, that will provide power, cooling, heating and ventilation for CBPD's Intelligent Workplace, the IW. The energy sources for this system, the IWESS, are solar radiation and bioDiesel fuel. The components of this overall system are: (1) a solar driven cooling and heating system for the IW comprising solar receivers, an absorption chiller, heat recovery exchanger, and circulation pump; (2) a bioDiesel fueled engine generator with heat recovery exchangers, one on the exhaust to provide steam and the other on the engine coolant to provide heated water; (3) a ventilation system including an enthalpy recovery wheel, an air based heat pump, an active desiccant wheel, and an air circulation fan; and (4) various convective and radiant cooling/heating units and ventilation air diffusers distributed throughout the IW. The goal of the ABETI/IWESS project is to demonstrate an energy supply system for a building space that will provide a healthy, comfortable environment for the occupants and that will reduce the quantity of energy consumed in the …
Date:
May 31, 2008
Creator:
Archer, David H.; Betz, Frederik; Gu, Yun; Li, Rong; Marion, Flore; Masson, Sophie et al.
Object Type:
Report
System:
The UNT Digital Library
Supported, Alkali-Promoted Cobalt Oxide Catalysts for NOx Removal from Coal Combustion Flue Gases
A series of cobalt oxide catalysts supported on alumina ({gamma}-Al{sub 2}O{sub 3}) were synthesized with varying contents of cobalt and of added alkali metals, including lithium, sodium, potassium, rubidium, and cesium. Unsupported cobalt oxide catalysts and several cobalt oxide catalysts supported ceria (CeO{sub 2}) with varying contents of cobalt with added potassium were also prepared. The catalysts were characterized with UV-visible spectroscopy and were examined for NO{sub x} decomposition activity. The CoO{sub x}/Al{sub 2}O{sub 3} catalysts and particularly the CoO{sub x}/CeO{sub 2} catalysts show N{sub 2}O decomposition activity, but none of the catalysts (unsupported Co{sub 3}O{sub 4} or those supported on ceria or alumina) displayed significant, sustained NO decomposition activity. For the Al{sub 2}O{sub 3}-supported catalysts, N{sub 2}O decomposition activity was observed over a range of reaction temperatures beginning about 723 K, but significant (>50%) conversions of N{sub 2}O were observed only for reaction temperatures >900 K, which are too high for practical commercial use. However, the CeO{sub 2}-supported catalysts display N{sub 2}O decomposition rates similar to the Al{sub 2}O{sub 3}-supported catalysts at much lower reaction temperatures, with activity beginning at {approx}573 K. Conversions of >90% were achieved at 773 K for the best catalysts. Catalytic rates per cobalt atom …
Date:
December 31, 2005
Creator:
Argyle, Morris D.
Object Type:
Report
System:
The UNT Digital Library
Data Standards for the Genomes to Life Program
Existing GTL Projects already have produced volumes of dataand, over the course of the next five years, will produce an estimatedhundreds, or possibly thousands, of terabytes of data from hundreds ofexperiments conducted at dozens of laboratories in National Labs anduniversities across the nation. These data will be the basis forpublications by individual researchers, research groups, andmulti-institutional collaborations, and the basis for future DOEdecisions on funding further research in bioremediation. The short-termand long-term value of the data to project participants, to the DOE, andto the nation depends, however, on being able to access the data and onhow, or whether, the data are archived. The ability to access data is thestarting point for data analysis and interpretation, data integration,data mining, and development of data-driven models. Limited orinefficient data access means that less data are analyzed in acost-effective and timely manner. Data production in the GTL Program willlikely outstrip, or may have already outstripped, the ability to analyzethe data. Being able to access data depends on two key factors: datastandards and implementation of the data standards. For the purpose ofthis proposal, a data standard is defined as a standard, documented wayin which data and information about the data are describe. The attributesof the …
Date:
January 31, 2004
Creator:
Arkin, Adam; Ambrosiano, John; Babnigg, Gyorgy; Frank, Ed; Geist,Al; Giometti, Carol et al.
Object Type:
Report
System:
The UNT Digital Library
Convection Heat Transfer in Three-Dimensional Turbulent Separated/Reattached Flow
The measurements and the simulation of convective heat transfer in separated flow have been a challenge to researchers for many years. Measurements have been limited to two-dimensional flow and simulations failed to predict accurately turbulent heat transfer in the separated and reattached flow region (prediction are higher than measurements by more than 50%). A coordinated experimental and numerical effort has been initiated under this grant for examining the momentum and thermal transport in three-dimensional separated and reattached flow in an effort to provide new measurements that can be used for benchmarking and for improving the simulation capabilities of 3-D convection in separated/reattached flow regime. High-resolution and non-invasive measurements techniques are developed and employed in this study to quantify the magnitude and the behavior of the three velocity components and the resulting convective heat transfer. In addition, simulation capabilities are developed and employed for improving the simulation of 3-D convective separated/reattached flow. Such basic measurements and simulation capabilities are needed for improving the design and performance evaluation of complex (3-D) heat exchanging equipment. Three-dimensional (3-D) convective air flow adjacent to backward-facing step in rectangular channel is selected for the experimental component of this study. This geometry is simple but it exhibits …
Date:
October 31, 2007
Creator:
Armaly, Bassem F.
Object Type:
Report
System:
The UNT Digital Library
Field Demonstration of a High-Efficiency Packaged Rooftop Air Conditioning Unit at Fort Gordon, Augusta, GA
As part of a larger program targeting the market transformation of packaged rooftop air conditioning, five high-efficiency rooftop air conditioning products were selected in 2002 by the U.S. Department of Energy (DOE) under the Unitary Air Conditioner (UAC) Technology Procurement (http://www.pnl.gov/uac). In February 2003, Fort Gordon in Augusta, Georgia was chosen as the demonstration site. With the goal of validating the field performance and operation of one of the awarded products, a 10-ton high-efficiency packaged rooftop unit (RTU) manufactured by Global Energy Group (GEG) was installed at Fort Gordon in October 2003. Following equipment installation, power metering, air- and refrigerant-side instrumentation was installed on the GEG RTU and a 4-year old typical-efficiency 20-ton RTU manufactured by AAON . The GEG and AAON units were instrumented identically and operated May through July, 2005, to observe performance under a range of conditions. Based on the data collected as part of this demonstration, the GEG equipment performed at least 8% better in stage-1 (single compressor running) cooling and at least 16% better in stage-2 (both compressors running) than the baseline AAON equipment. Performance comparisons are based on what we call application EER normalized to equivalent specific fan power. The full-load, specific-fan-power-normalized application EERs …
Date:
March 31, 2006
Creator:
Armstrong, Peter R.; Sullivan, Gregory P. & Parker, Graham B.
Object Type:
Report
System:
The UNT Digital Library
Garrett Electric Boosting Systems (EBS) Program
Turbo diesel engine use in passenger cars in Europe has resulted in 30-50% improvement in fuel economy. Diesel engine application is particularly suitable for US because of vehicle size and duty cycle patterns. Adopting this technology for use in the US presents two issues--emissions and driveability. Emissions reduction technology is being well addressed with advanced turbocharging, fuel injection and catalytic aftertreatment systems One way to address driveability is to eliminate turbo lag and increase low speed torque. Electrically assisted turbocharging concepts incorporated in e-Turbo{trademark} designs do both The purpose of this project is to design and develop an electrically assisted turbocharger, e-Turbo{trademark}, for diesel engine use in the US. In this report, early design and development of electrical assist technology is described together with issues and potential benefits. In this early phase a mathematical model was developed and verified. The model was used in a sensitivity study. The results of the sensitivity study together with the design and test of first generation hardware was fed into second generation designs. In order to fully realize the benefits of electrical assist technology it was necessary to expand the scope of work to include technology on the compressor side as well as electronic …
Date:
March 31, 2005
Creator:
Arnold, Steve; Balis, Craig; Barthelet, Pierre; Poix, Etienne; Samad, Tariq; Hampson, Greg et al.
Object Type:
Report
System:
The UNT Digital Library
The Mailbox Computer System for the IAEA verification experiment on HEU downlending at the Portsmouth Gaseous Diffusion Plant
IN APRIL 1996, THE UNITED STATES (US) ADDED THE PORTSMOUTH GASEOUS DIFFUSION PLANT TO THE LIST OF FACILITIES ELIGIBLE FOR THE APPLICATION OF INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA) SAFEGUARDS. AT THAT TIME, THE US PROPOSED THAT THE IAEA CARRY OUT A ''VERIFICATION EXPERIMENT'' AT THE PLANT WITH RESPECT TO DOOWNBLENDING OF ABOUT 13 METRIC TONS OF HIGHLY ENRICHED URANIUM (HEU) IN THE FORM OF URANIUM HEXAFLUROIDE (UF6). DURING THE PERIOD DECEMBER 1997 THROUGH JULY 1998, THE IAEA CARRIED OUT THE REQUESTED VERIFICATION EXPERIMENT. THE VERIFICATION APPROACH USED FOR THIS EXPERIMENT INCLUDED, AMONG OTHER MEASURES, THE ENTRY OF PROCESS-OPERATIONAL DATA BY THE FACILITY OPERATOR ON A NEAR-REAL-TIME BASIS INTO A ''MAILBOX'' COMPUTER LOCATED WITHIN A TAMPER-INDICATING ENCLOSURE SEALED BY THE IAEA.
Date:
July 31, 2000
Creator:
Aronson, Arnold L. & Gordon, David M.
Object Type:
Report
System:
The UNT Digital Library
Next Generation Engineered Materials for Ultra Supercritical Steam Turbines
To reduce the effect of global warming on our climate, the levels of CO{sub 2} emissions should be reduced. One way to do this is to increase the efficiency of electricity production from fossil fuels. This will in turn reduce the amount of CO{sub 2} emissions for a given power output. Using US practice for efficiency calculations, then a move from a typical US plant running at 37% efficiency to a 760 C /38.5 MPa (1400 F/5580 psi) plant running at 48% efficiency would reduce CO2 emissions by 170kg/MW.hr or 25%. This report presents a literature review and roadmap for the materials development required to produce a 760 C (1400 F) / 38.5MPa (5580 psi) steam turbine without use of cooling steam to reduce the material temperature. The report reviews the materials solutions available for operation in components exposed to temperatures in the range of 600 to 760 C, i.e. above the current range of operating conditions for today's turbines. A roadmap of the timescale and approximate cost for carrying out the required development is also included. The nano-structured austenitic alloy CF8C+ was investigated during the program, and the mechanical behavior of this alloy is presented and discussed as an …
Date:
May 31, 2006
Creator:
Arrell, Douglas
Object Type:
Report
System:
The UNT Digital Library
Advanced Communication and Control of Distributed Energy Resources at Detroit Edison
The project objective was to create the communication and control system, the process and the economic procedures that will allow owners (e.g., residential, commercial, industrial, manufacturing, etc.) of Distributed Energy Resources (DER) connected in parallel to the electric distribution to have their resources operated in a manner that protects the electric utility distribution network and personnel that may be working on the network. The Distribution Engineering Workstation (DEW) (a power flow and short circuit modeling tool) was modified to calculate the real-time characteristics of the distribution network based on the real-time electric distribution network information and provide DER operating suggestions to the Detroit Edison system operators so that regional electric stability is maintained. Part of the suggestion algorithm takes into account the operational availability of DER’s, which is known by the Energy Aggregator, DTE Energy Technologies. The availability information will be exchanged from DTE Energy Technologies to Detroit Edison. For the calculated suggestions to be used by the Detroit Edison operators, procedures were developed to allow an operator to operate a DER by requesting operation of the DER through DTE Energy Technologies. Prior to issuing control of a DER, the safety of the distribution network and personnel needs to be …
Date:
January 31, 2004
Creator:
Asgeirsson, Haukur & Seguin, Richard
Object Type:
Report
System:
The UNT Digital Library
Low-Dislocation-Density GaN from a Single Growth on a Textured Substrate
The density of threading dislocations (TD) in GaN grown directly on flat sapphire substrates is typically greater than 10{sup 9}/cm{sup 2}. Such high dislocation densities degrade both the electronic and photonic properties of the material. The density of dislocations can be decreased by orders of magnitude using cantilever epitaxy (CE), which employs prepatterned sapphire substrates to provide reduced-dimension mesa regions for nucleation and etched trenches between them for suspended lateral growth of GaN or AlGaN. The substrate is prepatterned with narrow lines and etched to a depth that permits coalescence of laterally growing III-N nucleated on the mesa surfaces before vertical growth fills the etched trench. Low dislocation densities typical of epitaxial lateral overgrowth (ELO) are obtained in the cantilever regions and the TD density is also reduced up to 1 micrometer from the edge of the support regions.
Date:
July 31, 2000
Creator:
Ashby, Carol I.; Willan, Christine C.; Han, Jung; Missert, Nancy A.; Provencio, Paula P.; Follstaedt, David M. et al.
Object Type:
Article
System:
The UNT Digital Library
A University Consortium on Low Temperature Combustion for High Efficiency, Ultra-Low Emission Engines
The objective of the University consortium was to investigate the fundamental processes that determine the practical boundaries of Low Temperature Combustion (LTC) engines and develop methods to extend those boundaries to improve the fuel economy of these engines, while operating with ultra low emissions. This work involved studies of thermal effects, thermal transients and engine management, internal mixing and stratification, and direct injection strategies for affecting combustion stability. This work also examined spark-assisted Homogenous Charge Compression Ignition (HCCI) and exhaust after-treatment so as to extend the range and maximize the benefit of Homogenous Charge Compression Ignition (HCCI)/ Partially Premixed Compression Ignition (PPCI) operation. In summary the overall goals were: ï‚· Investigate the fundamental processes that determine the practical boundaries of Low Temperature Combustion (LTC) engines. ï‚· Develop methods to extend LTC boundaries to improve the fuel economy of HCCI engines fueled on gasoline and alternative blends, while operating with ultra low emissions. ï‚· Investigate alternate fuels, ignition and after-treatment for LTC and Partially Premixed compression Ignition (PPCI) engines.
Date:
December 31, 2009
Creator:
Assanis, Dennis N.; Atreya, Arvind; Chen, Jyh-Yuan; Cheng, Wai K.; Dibble, Robert W.; Edwards, Chris et al.
Object Type:
Report
System:
The UNT Digital Library
A University Consortium on Homogeneous Charge Compression Ignition Engine Research
Over the course of this four year project, the consortium team members from UM, MIT, Stanford, and Berkeley along with contributors from Sandia National Labs and LLNL, have produced a wide range of results on gasoline HCCI control and implementation. The work spanned a wide range of activities including engine experiments, fundamental chemical kinetics experiments, and an array of analytical modeling techniques and simulations. Throughout the project a collaborative approach has produced a many significant new insights into HCCI engines and their behavior while at the same time we achieved our key consortium goal: to develop workable strategies for gasoline HCCI control and implementation. The major accomplishments in each task are summarized, followed by detailed discussion.
Date:
March 31, 2007
Creator:
Assanis, Dennis; Atreya, Arvind; Bowman, Craig; Chen, Jyh-Yuan; Cheng, Wai; Davidson, David et al.
Object Type:
Report
System:
The UNT Digital Library
Hydration and mobility of HO-(aq)
The hydroxide anion plays an essential role in many chemical and biochemical reactions. But questions of its hydration state and transport in water are currently controversial. Here we address this situation using the quasi-chemical theory of solutions. The simplest such approach suggests that HO [H20]3- is the most probable species at infinite dilution in aqueous solution under standard conditions, followed by the HO . [H20]2- and HO . [HzO]- forms which are close together in stablity. HO . [H20]4- is less stable, in contrast to recent proposals that the latter structure is the most stable hydration species in solution. Ab initio molecular dynamics results presented here support the dominance of the tri-hydrated form, but that the population distribution is broad and sensitive to solution conditions. On the basis of these results, the mobility of hydroxide can be simply that of a proton hole. This contrasts with recent proposals invoking the interconversion of a stable 'trap' structure HO . [H20]4- to HO . [H20]3- as the rate determining step in the transport process.
Date:
October 31, 2002
Creator:
Asthagiri, D. (Dilipkumar); Pratt, Lawrence Riley; Kress, J. D. (Joel D.) & Gomez, M. A. (Maria A.)
Object Type:
Article
System:
The UNT Digital Library
Chemical Conversion of TNT: Production of 2,4,6-Trinitrobenzoic Acid
Oxidation of 2,4,6-trinitrotoluene (TNT) by aqueous nitric acid at high temperature and pressure gives 2,4,6-trinitrobenzoic acid (TNBA) and other valuable products, such as 1,3,5-trinitrobenzene (TNB). Optimization of the kinetics proved to be critical for the selective oxidation of the methyl group. High yield of a desired product can be obtained only under a narrow range of conditions. Thus, the best yield (70 to 75%) of TNBA was achieved at a 35 to 45% conversion of TNT (80% nitric acid, 194 C, 20 min), whereas the decarboxylation product (TNB) was the major component of the reaction mixture after a 50-min reaction. Subsequent separation of TNBA was achieved by selective extraction with aqueous bicarbonate. Practical technology development steps for a continuous mode of operation leading to the chief products are also discussed. This technology can use commercial raw trotyl and trotyl from discharged ammunition as the starting material. The latter could be of particular importance for the conversion program aimed at the utilization of ammunition supplies.
Date:
August 31, 2000
Creator:
Astrat'ev, A.A.
Object Type:
Report
System:
The UNT Digital Library
Measurement of Branching Fractions in Radiative BDecays to eta K gamma and Search for B Decays to eta' K gamma
The authors present measurements of the B {yields} {eta}K{gamma} branching fractions and upper limits for the B {yields} {eta}'K{gamma} branching fractions. For B{sup +} {yields} {eta}K{sup +}{gamma} they also measure the time-integrated charge asymmetry. The data sample, collected with the BABAR detector at the Stanford Linear Accelerator Center, represents 232 x 10{sup 6} produced B{bar B} pairs. The results for branching fractions and upper limits at 90% C.L. in units of 10{sup -6} are: {Beta}(B{sup 0} {yields} {eta}K{sup 0}{gamma}) = 11.3{sub -2.6}{sup +2.8} {+-} 0.6, {Beta}(B{sup +} {yields} {eta}K{sup +}{gamma}) = 10.0 {+-} 1.3 {+-} 0.5, {Beta}(B{sup 0} {yields} {eta}'K{sup 0}{gamma}) < 6.6, {Beta}(B{sup +} {yields} {eta}'K{sup +}{gamma}) < 4.2. The charge asymmetry in the decay B{sup +} {yields} {eta}K{sup +}{gamma} is {Alpha}{sub ch} = -0.09 {+-} 0.12 {+-} 0.01. The first errors are statistical and the second systematic.
Date:
March 31, 2006
Creator:
Aubert, B.
Object Type:
Report
System:
The UNT Digital Library
Search for B+ to X(3872) K+, X(3872) to J/psi gamma
In a study of B{sup +} {yields} J/{psi}{gamma}K{sup +} decays, they find evidence for the radiative decay X(3872) {yields} J/{psi}{gamma} with a statistical significance of 3.4{sigma}. They measure the product of branching fractions {Beta}(B{sup +} {yields} X(3872)K{sup +}) {center_dot} {Beta}(X(3872) {yields} J/{psi}{gamma}) = (3.3 {+-} 1.0 {+-} 0.3) x 10{sup -6}, where the uncertainties are statistical and systematic, respectively. They also measure the branching fraction {Beta}(B{sup +} {yields} {chi}{sub c1}K{sup +}) = (4.9 {+-} 0.20 {+-} 0.4) x 10{sup -4}. These results are obtained from (287 {+-} 3) million B{bar B} decays collected at the {Upsilon}(4S) resonance with the BABAR detector at the PEP-II B Factory at SLAC.
Date:
July 31, 2006
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Search for T, CP and CPT Violation in B0-B0bar Mixingwith Inclusive Dilepton Events
The authors report the results of a search for T, CP and CPT violation in B{sup 0}-{bar B}{sup 0} mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. Using a sample of 232 million B{bar B} pairs, with a simultaneous likelihood fit of the same-sign and opposite-sign dileptons, they measure the T and Cp violation parameter |q/p|-1 = (-0.8 {+-} 2.7(stat.) {+-} 1.9(syst.)) x 10{sup -3}, and the CPT and CP parameters Im z = (-13.9 {+-} 7.3(stat.) {+-} 3.2(syst.)) x 10{sup -3} and {Delta}{Lambda} x Re z = (-7.1 {+-} 3.9(stat.) {+-} 2.0(syst.)) x 10{sup -3} ps{sup -1}. The statistical correlation between the measurements of Im z and {Delta}{Lambda} x Re z is 76%.
Date:
March 31, 2006
Creator:
Aubert, B.
Object Type:
Report
System:
The UNT Digital Library
Searches for B0 Decays to eta K0, eta eta,eta' eta', eta phi, and eta'phi
The authors search for B{sup 0} meson decays into two-body combinations of K{sup 0}, {eta}, {eta}', and {phi} mesons in 324 million B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC. They measure the following branching fractions (upper limits at 90% confidence level) in units of 10{sup -6}: {Beta}(B{sup 0} {yields} {eta}K{sup 0}) = 1.8{sub -0.6}{sup +0.7} {+-} 0.1 (< 2.9), {Beta}(B{sup 0} {yields} {eta}{eta}) = 1.1{sub -0.4}{sup +0.5} {+-} 0.1(< 1.8), {Beta}(B{sup 0} {yields} {eta}{phi}) = 0.1 {+-} 0.2 {+-} 0.1(< 0.6), {Beta}(B{sup 0} {yields} {eta}'{phi}) = 0.2{sub -0.3}{sup +0.4} {+-} 0.1(< 1.0), and {Beta}(B{sup 0} {yields} {eta}'{eta}') = 1.0{sub -0.6}{sup +0.8} {+-} 0.1 (< 2.4), where the first error is statistical and the second systematic.
Date:
July 31, 2006
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library