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246,520 Matching Results

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(open access)

Measurement of the Top Quark Mass and ppbar -> ttbar Cross Section in the All-Hadronic Mode with the CDFII Detector

We present a measurement of the top quark mass and of the top-antitop pair production cross section using p{bar p} data collected with the CDF II detector at the Tevatron Collider at the Fermi National Accelerator Laboratory and corresponding to an integrated luminosity of 2.9 fb{sup -1}. We select events with six or more jets satisfying a number of kinematical requirements imposed by means of a neural network algorithm. At least one of these jets must originate from a b quark, as identified by the reconstruction of a secondary vertex inside the jet. The mass measurement is based on a likelihood fit incorporating reconstructed mass distributions representative of signal and background, where the absolute jet energy scale (JES) is measured simultaneously with the top quark mass. The measurement yields a value of 174.8 {+-} 2.4(stat+JES){sub -1.0}{sup +1.2}(syst)GeV/c{sup 2}, where the uncertainty from the absolute jet energy scale is evaluated together with the statistical uncertainty. The procedure measures also the amount of signal from which we derive a cross section, {sigma}{sub t{bar t}} = 7.2 {+-} 0.5(stat) {+-} 1.0(syst) {+-} 0.4(lum) pb, for the measured values of top quark mass and JES.

Date: February 1, 2010

Creator: Aaltonen, T.; Phys., /Helsinki Inst. of; Adelman, J.; /Chicago U., EFI; Alvarez Gonzalez, B.; Phys., /Cantabria Inst. of et al.

Object Type: Article

System: The UNT Digital Library

$Observation of $B^0_s \to J/\psi K^{*0}(892)$ and $B^0_s \to J/\psi K^0_S$ Decays$ (open access)

Observation of $B^0_s \to J/\psi K^{*0}(892)$ and $B^0_s \to J/\psi K^0_S$ Decays

The authors report the first observation of two Cabibbo-suppressed decay modes of the B{sub s}{sup 0} meson. Using a sample of p{bar p} collisions at {radical}s = 1.96 TeV corresponding to 5.9 fb{sup -1} of integrated luminosity collected with the CDF II detector at the Fermilab Tevatron, they search for new B{sub s}{sup 0} decay modes in a sample of events containing J/{psi} {yields} {mu}{sup +}{mu}{sup -} decays. They reconstruct a B{sub s}{sup 0} {yields} J/{psi} K*(892){sup 0} signal with K*(892){sup 0} {yields} K{sup +}{pi}{sup -}, observing a yield of 151 {+-} 25 events with a statistical significance of 8.0{sigma}. They also reconstruct a B{sub s}{sup 0} {yields} J/{psi} K{sub S}{sup 0} signal with K{sub S}{sup 0} {yields} {pi}{sup +}{pi}{sup -}, observing a yield of 64 {+-} 14 events with a statistical significance of 7.2{sigma}. From these yields, they extract the branching ratios {Beta}(B{sub s}{sup 0} {yields} J/{psi} K*(892){sup 0}) = (8.3 {+-} 3.8) x 10{sup -5} and {Beta}(B{sub s}{sup 0} {yields} J/{psi} K{sup 0}) = (3.5 {+-} 0.8) x 10{sup -5}, where statistical, systematic, and fragmentation-fraction uncertainties are included in the combined uncertainty.

Date: February 1, 2011

Creator: Aaltonen, T.; Phys., /Helsinki Inst. of; Alvarez Gonzalez, B.; Phys., /Cantabria Inst. of; Amerio, S.; /INFN, Padua et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Thomson scattering diagnostic analyses to determine the energetic particle distributions in TFTR

The research completed and in progress for the first period of this grant is reviewed. Specific scattering scenarios for TFTR and JET and ITER were studied. The Lodestar scattering code, SKATR, was upgraded to include anisotropic energetic ion distributions and an analytic diffraction formulation was completed. Research continues on JET studies and upgrading the code for JET and ITER relevant conditions.

Date: February 12, 1993

Creator: Aamodt, R. E.; Cheung, P. & Russell, D. A.

Object Type: Report

System: The UNT Digital Library

(open access)

Thomson scattering diagnostic analyses to determine the energetic particle distributions in TFTR. Annual performance report

Date: February 12, 1993

Creator: Aamodt, R. E.; Cheung, P. & Russell, D. A.

Object Type: Report

System: The UNT Digital Library

(open access)

Thomson scattering diagnostic analyses to determine the energetic particle distributions in TFTR. Final report

Lodestar has been an active participant in the low power Collective Thomson Scattering (CTS) diagnostic at TFTR in collaboration with MIT. Extensive studies were conducted regarding the use of gyrotron scattering as a low cost diagnostic for both energetic ions and alpha particles on TFTR. The numerical scattering code has been improved and compared with similar code developed at JET. The authors have participated and assisted in the CTS experiments through onsite visits and have successfully performed most of the data analysis tasks remotely. Through their analysis on the initial data base accumulated, they are able to understand qualitatively the general features of the anomalous large scattered signal, have proposed an explanation for its generation mechanism, and have suggested a potential new use of CTS as an edge diagnostic.

Date: February 16, 1995

Creator: Aamodt, R. E.; Cheung, P. Y. & Russell, D. A.

Object Type: Report

System: The UNT Digital Library

(open access)

Artificial geothermal reservoirs in hot volcanic rock

S>Some recent results from the Los Alamos program in which hydraulic fracturing is used for the recovery of geothermal energy are discussed. The location is about 4 kilometers west and south of the ring fault of the enormous Jemez Caldera in the northcentral part of New Mexico. It is shown that geothermal energy may be extracted from hot rock that does not contain circulating hot water or steam and is relatively impermeable. A fluid is pumped at high pressure into an isolated section of a wellbore. If the well is cased the pipe in this pressurized region is perforated as it is in the petroleum industry, so that the pressure may be applied to the rock, cracking it. A second well is drilled a few hundred feet away from the first. Cold water is injected through the first pipe, circulates through the crack, and hot water returns to the surface through the second pipe. Results are described and circumstances are discussed under which artiflcial geothermal reservoirs might be created in the basaltic rock of Hawaii. (MCW)

Date: February 8, 1974

Creator: Aamodt, R. L.

Object Type: Report

System: The UNT Digital Library

$Hydraulic fracture experiments in GT-1 and GT-2$ (open access)

Hydraulic fracture experiments in GT-1 and GT-2

Hydraulic fracturing experiments were conducted in granite rock, at temperatures near 100 and 150/sup 0/C, in two wells 0.785 km (2575 ft) and 1.98 km (6500 ft) deep near Los Alamos, New Mexico. No unusual difficulty was observed in fracturing crystalline rock hydraulically. The apparent surface energy (energy required to create new fracture surface by breaking the rock) was measured as 100 J/m/sup 2/. Orientation of the deeper fracture was measured as N35/sup 0/E (+-5/sup 0/). The fraction of fluid injected into the rock that could be recovered at hydrostatic surface pressure was measured. The efficiency of recovery was as high as 92 percent after the fracture impedance was lowered by ''propping'' the fracture with sand. Permeability of the rock over the face of the fracture was compatible with laboratory measurements (10/sup -7/ to 10/sup -8/ darcys). Downhole pressures required to extend the fractures were about 150 and 340 bars (2175 and 4900 psi), respectively.

Date: February 1, 1977

Creator: Aamodt, R. L.

Object Type: Report

System: The UNT Digital Library

(open access)

Gas cylinder disposal pit remediation waste minimization and management

A remediation of a gas cylinder disposal pit at Sandia National Laboratories, New Mexico has recently been completed. The cleanup prevented possible spontaneous releases of hazardous gases from corroded cylinders that may have affected nearby active test areas at Sandia`s Technical Area III. Special waste management, safety, and quality plans were developed and strictly implemented for this project. The project was conceived from a waste management perspective, and waste minimization and management were built into the planning and implementation phases. The site layout was planned to accommodate light and heavy equipment, storage of large quantities of suspect soil, and special areas to stage and treat gases and reactive chemicals removed from the pit, as well as radiation protection areas. Excavation was a tightly controlled activity using experienced gas cylinder and reactive chemical specialists. Hazardous operations were conducted at night under lights, to allow nearby daytime operations to function unhindered. The quality assurance plan provided specific control of, and documentation for, critical decisions, as well as the record of daily operations. Both hand and heavy equipment excavation techniques were utilized. Hand excavation techniques were utilized. Hand excavation techniques allows sealed glass containers to be exhumed unharmed. In the end, several dozen …

Date: February 1, 1995

Creator: Aas, C. A.; Solow, A.; Brannon, R.; Schwender, J. M.; Criswell, C. W.; Eckman, C. K. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

A PC-based software package for modeling DOE mixed-waste management options

The U.S. Department of Energy (DOE) Headquarters and associated contractors have developed an IBM PC-based software package that estimates costs, schedules, and public and occupational health risks for a range of mixed-waste management options. A key application of the software package is the comparison of various waste-treatment options documented in the draft Site Treatment Plans prepared in accordance with the requirements of the Federal Facility Compliance Act of 1992. This automated Systems Analysis Methodology consists of a user interface for configuring complexwide or site-specific waste-management options; calculational algorithms for cost, schedule and risk; and user-selected graphical or tabular output of results. The mixed-waste management activities modeled in the automated Systems Analysis Methodology include waste storage, characterization, handling, transportation, treatment, and disposal. Analyses of treatment options identified in the draft Site Treatment Plans suggest potential cost and schedule savings from consolidation of proposed treatment facilities. This paper presents an overview of the automated Systems Analysis Methodology.

Date: February 1, 1995

Creator: Abashian, M.S.; Carney, C. & Schum, K.

Object Type: Article

System: The UNT Digital Library

(open access)

Study of direct CP violation in B+- ---> J/psi K+- (pi+-) file decays

The authors present a search for direct CP violation in B{sup {+-}} {yields} J/{psi}K{sup {+-}}{pi}{sup {+-}} decays. The event sample is selected from 2.8 fb{sup -1} of p{bar p} collisions recorded by D0 experiment in Run II of the Fermilab Tevatron Collider. The charge asymmetry A{sub CP}(B{sup +} {yields} J/{psi}K{sup +}) = +0.0075 {+-} 0.0061(stat.) {+-} 0.0027(syst.) is obtained using a sample of approximately 40 thousand B{sup {+-}} {yields} J/{psi}K{sup {+-}} decays. The achieved precision is of the same level as the expected deviation predicted by some extensions of the standard model. They also measured the charge asymmetry A{sub CP}(B{sup +} {yields} J/{psi}{pi}{sup +}) = -0.09 {+-} 0.08(stat.){+-}0.03(syst.).

Date: February 1, 2008

Creator: Abazov, V. M.; /Dubna, JINR; Abbott, B.; U., /Oklahoma; Abolins, M.; U., /Michigan State et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Measurement of B0(s) mixing parameters from the flavor-tagged decay B0(s) ---> J/psi phi

From an analysis of the flavor-tagged decay B{sub s}{sup 0} {yields} J/{psi}{phi} they obtain the width difference between the B{sub s}{sup 0} light and heavy mass eigenstates, {Delta}{Lambda}{sub s} {triple_bond} {Lambda}{sub L} - {Lambda}{sub H} = 0.19 {+-} 0.07(stat){sub -0.01}{sup +0.02}(syst) ps{sup -1}, and the CP-violating phase, {phi}{sub s} = -0.57{sub -0.30}{sup +0.24}(stat){sub -0.02}{sup +0.07}(syst). The allowed 90% C.L. intervals of {Delta}{Lambda}{sub s} and {phi}{sub s} are 0.06 < {Delta}{Lambda}{sub s} < 0.30 ps{sup -1} and -1.20 < {phi}{sub s} < 0.06, respectively. The data sample corresponds to an integrated luminosity of 2.8 fb{sup -1} accumulated with the D0 detector at the Fermilab Tevatron collider.

Date: February 1, 2008

Creator: Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Measurement of inclusive differential cross sections for Upsilon(1S) production in p anti-p collisions at s**(1/2) = 1.96-TeV

The authors present measurements of the inclusive production cross sections of the {Upsilon}(1S) bottomonium state in p{bar p} collisions at {radical}s = 1.96 TeV. Using the {Upsilon}(1S) {yields} {mu}{sup +}{mu}{sup -} decay mode for a data sample of 159 {+-} 10 pb{sup -1} collected by the D0 detector at the Fermilab Tevatron collider, they determine the differential cross sections as a function of the {Upsilon}(1S) transverse momentum for three ranges of the {Upsilon}(1S) rapidity: 0 < |y{sup {Upsilon}}| {le} 0.6, 0.6 < |y{sup {Upsilon}}| {le} 1.2, and 1.2 < |y{sup {Upsilon}}| {le} 1.8.

Date: February 1, 2005

Creator: Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Measurement of the B(c) meson mass in the exclusive decay B(c) ---> J / psi pi

None

Date: February 1, 2008

Creator: Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Measurement of the inclusive jet cross-section in p anti-p collisions at s**91/2) =1.96-TeV

None

Date: February 1, 2008

Creator: Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Study of Z gamma events and limits on anomalous Z Z gamma and Z gamma gamma couplings in p anti-p collisions at s**(1/2) = 1.96-TeV

The authors present a measurement of the Z{gamma} production cross section and limits on anomalous ZZ{gamma} and Z{gamma}{gamma} couplings for form-factor scales of {Lambda} = 750 and 1000 GeV. The measurement is based on 138 (152) candidate events in the ee{gamma} ({mu}{mu}{gamma}) final state using 320 (290) pb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV. The 95% C.L. limits on real and imaginary parts of individual anomalous couplings are |h{sub 10,30}{sup Z}| < 0.23, |h{sub 20,40}{sup Z}| < 0.020, |h{sub 10,30}{gamma}| < 0.23, and |h{sub 20,40}{gamma}| < 0.019 for {Lambda} = 1000 GeV.

Date: February 1, 2005

Creator: Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Measurement of the Z gamma ---> nu anti-nu gamma cross section and limits on anomalous Z Z gamma and Z gamma gamma couplings in p anti-p collisions at s**(1/2) = 1.96-TeV

We present the first observation of the Z{gamma} {yields}{nu}{bar {nu}}{gamma} process at the Tevatron at 5.1 standard deviations significance, based on 3.6 fb{sup -1} of integrated luminosity collected with the D0 detector at the Fermilab Tevatron p{bar p} Collider at {radical}s = 1.96 TeV. The measured Z{gamma} cross section multiplied by the branching fraction of Z {yields} {nu}{bar {nu}} is 32 {+-} 9(stat. + syst.) {+-} 2(lumi.) fb for the photon E{sub T} > 90 GeV. It is in agreement with the standard model prediction of 39 {+-} 4 fb. We set the most restrictive limits on anomalous trilinear Z{gamma}{gamma} and ZZ{gamma} gauge boson couplings at a hadron collider to date, with three constraints being the world's strongest.

Date: February 1, 2009

Creator: Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, Bannanje Sripath; Adams, M.; Adams, T. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

A PORTABLE BANDSAW FOR HOT CELL USE

A commercial light-weight portable bandsaw was fitted with a grip to permit it to be maneuvered remotely in a hot cell by means of a General Mills manipulator The bandsaw was supported in various positions to make cuts on typical pieces. Photographs show the saw in operation. (auth)

Date: February 19, 1958

Creator: Abbatiello, A. A.

Object Type: Report

System: The UNT Digital Library

(open access)

The Ringling Booster (Ringling, Okla.), Vol. 13, No. 35, Ed. 1 Thursday, February 22, 1923

Weekly newspaper from Ringling, Oklahoma that includes local, state, and national news along with advertising.

Date: February 22, 1923

Creator: Abbey, D. P.

Object Type: Newspaper

System: The Gateway to Oklahoma History

(open access)

The Ringling Eagle (Ringling, Okla.), Vol. 13, No. 32, Ed. 1 Thursday, February 1, 1923

Weekly newspaper from Ringling, Oklahoma that includes local, state, and national news along with advertising.

Date: February 1, 1923

Creator: Abbey, D. P.

Object Type: Newspaper

System: The Gateway to Oklahoma History

(open access)

The Ringling Eagle (Ringling, Okla.), Vol. 13, No. 33, Ed. 1 Thursday, February 8, 1923

Weekly newspaper from Ringling, Oklahoma that includes local, state, and national news along with advertising.

Date: February 8, 1923

Creator: Abbey, D. P.

Object Type: Newspaper

System: The Gateway to Oklahoma History

(open access)

The Ringling Eagle (Ringling, Okla.), Vol. 13, No. 34, Ed. 1 Thursday, February 15, 1923

Weekly newspaper from Ringling, Oklahoma that includes local, state, and national news along with advertising.

Date: February 15, 1923

Creator: Abbey, D. P.

Object Type: Newspaper

System: The Gateway to Oklahoma History

(open access)

The Rural Co-operator (Ringling, Okla.), Vol. 1, No. 1, Ed. 1 Thursday, February 22, 1923

Weekly newspaper from Ringling, Oklahoma that includes local, state, and national news along with advertising.

Date: February 22, 1923

Creator: Abbey, D. P.

Object Type: Newspaper

System: The Gateway to Oklahoma History

(open access)

BNL Archive and Dissemination System. [For accessing data files constructed at separate places and times]

The Brookhaven National Laboratory Archive and Dissemination System (BNLADS) is designed to deal with the record keeping associated with archiving and disseminating sequential files through a computer network. This data base management system (DBMS) is implemented in a host language that is a subset of PL/I. The stored sequential files that can be dealt with by the BNLADS must be in character mode (ASCII, BCD, EBCDIC). The accessing of fields is specified by a format description which allows for forward processing of fields only. The structure of a case type statement allows for a data field determining a format sequence from a set of format sequences. A data description language (DDL) was devised to describe the accessing sequence of stored sequential files. A data model definition gives the user a view of the content of each stored sequential file. The DDL requires all field type references to contain the field name, so that the BNLADS can access all stored sequential files by logical field name and can write stored sequential files by stating the logical field name without the necessity of referring to formats. The BNLADS is architected in a stratified form in which the application programs are built on …

Date: February 1, 1977

Creator: Abbey, S; Fuchel, K; Heller, J; Lin, K S & Osterer, L

Object Type: Article

System: The UNT Digital Library

(open access)

Baling-Press.

Patent for "new and useful Improvements in Baling-Presses." (line 6-7) including instructions and illustrations.

Date: February 20, 1906

Creator: Abbot, Thomas & Abbot, Harry B.

Object Type: Patent

System: The Portal to Texas History

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