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Qcd physics: study of jet shapes in inclusive jet production in ppbar collisions at sqrt s = 1.96 tev
We present a search for excited and exotic electrons (e*) decaying to an electron and a photon, both with high transverse momentum. We use 202 pb{sup -1} of data collected in p{bar p} collisions at {radical}s = 1.96 TeV with the CDF II detector. No signal above standard model expectation is seen for associated ee* production. We discuss the e* sensitivity in the parameter space of the excited electron mass M{sub e*} and the compositeness energy scale {Lambda}. In the contact interaction model, we exclude 132 GeV/c{sup 2} < M{sub e*} < 879 GeV/c{sup 2} for {Lambda} = M{sub e*} at 95% confidence level (C.L.). In the gauge-mediated model, we exclude 126 GeV/c{sup 2} < M{sub e*} < 430 GeV/c{sup 2} at 95% C.L. for the phenomenological coupling f/{Lambda} {approx} 10{sup -2} GeV{sup -1}.
Date:
May 8, 2005
Creator:
Acosta, D.
Object Type:
Report
System:
The UNT Digital Library
Probing Dark Energy via Weak Gravitational Lensing with the Supernova Acceleration Probe (SNAP)
SNAP is a candidate for the Joint Dark Energy Mission (JDEM) that seeks to place constraints on the dark energy using two distinct methods. The first, Type Ia SN, is discussed in a separate white paper. The second method is weak gravitational lensing, which relies on the coherent distortions in the shapes of background galaxies by foreground mass structures. The excellent spatial resolution and photometric accuracy afforded by a 2-meter space-based observatory are crucial for achieving the high surface density of resolved galaxies, the tight control of systematic errors in the telescope's Point Spread Function (PSF), and the exquisite redshift accuracy and depth required by this project. These are achieved by the elimination of atmospheric distortion and much of the thermal and gravity loads on the telescope. The SN and WL methods for probing dark energy are highly complementary and the error contours from the two methods are largely orthogonal. The nominal SNAP weak lensing survey covers 1000 square degrees per year of operation in six optical and three near infrared filters (NIR) spanning the range 350 nm to 1.7 {micro}m. This survey will reach a depth of 26.6 AB magnitude in each of the nine filters and allow for …
Date:
August 8, 2005
Creator:
Albert, J.; Aldering, G.; Allam, S.; Althouse, W.; Amanullah, R.; Annis, J. et al.
Object Type:
Report
System:
The UNT Digital Library
Supernova Acceleration Probe: Studying Dark Energy with Type Ia Supernovae
The Supernova Acceleration Probe (SNAP) will use Type Ia supernovae (SNe Ia) as distance indicators to measure the effect of dark energy on the expansion history of the Universe. (SNAP's weak-lensing program is described in a separate White Paper.) The experiment exploits supernova distance measurements up to their fundamental systematic limit; strict requirements on the monitoring of each supernova's properties leads to the need for a space-based mission. Results from pre-SNAP experiments, which characterize fundamental SN Ia properties, will be used to optimize the SNAP observing strategy to yield data, which minimize both systematic and statistical uncertainties. With early R&D funding, we have achieved technological readiness and the collaboration is poised to begin construction. Pre-JDEM AO R&D support will further reduce technical and cost risk. Specific details on the SNAP mission can be found in Aldering et al. (2004, 2005). The primary goal of the SNAP supernova program is to provide a dataset which gives tight constraints on parameters which characterize the dark-energy, e.g. w{sub 0} and w{sub a} where w(a) = w{sub 0} + w{sub a}(1-a). SNAP data can also be used to directly test and discriminate among specific dark energy models. We will do so by building the …
Date:
August 8, 2005
Creator:
Albert, J.; Aldering, G.; Allam, S.; Althouse, W.; Amanullah, R.; Annis, J. et al.
Object Type:
Report
System:
The UNT Digital Library
Precision Electroweak Measurements on the Z Presonance
The authors report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. the data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLD experiment using a polarized beam at SLC. The measurements include cross-sections, forward-backward asymmetries and polarized asymmetries. The mass and width of the Z boson, m{sub Z} and {Lambda}{sub Z}, and its couplings to fermions, for example the {rho} parameter and the effective electroweak mixing angle for leptons, are precisely measured: m{sub Z} = 91.1875 {+-} 0.0021 GeV; {Lambda}{sub Z} = 2.4952 {+-} 0.0023 GeV; {rho}{sub {ell}} = 1.0050 {+-} 0.0010; sin{sup 2} {theta}{sub eff}{sup lept} = 0.23153 {+-} 0.00016. The number of light neutrino species is determined to be 2.9840 {+-} 0.0082, in agreement with the three observed generations of fundamental fermions. The results are compared to the predictions of the Standard Model. At the Z-pole, electroweak radiative corrections beyond the running of the QED and QCD coupling constants are observed with a significance of five standard deviations, and in agreement with the Standard Model. of …
Date:
September 8, 2005
Creator:
Aleph,Delphi,L3,Opal,SLD , Collaborations
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 20, No. 36, Ed. 1 Thursday, September 8, 2005
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
September 8, 2005
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 20, No. 49, Ed. 1 Thursday, December 8, 2005
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
December 8, 2005
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Reactive Multiphase Behavior of Co{sub 2} in Saline Aquifers Beneath the Colorado Plateau
Soil gas surveys have been carried out on the Colorado Plateau over areas with natural occurrences of CO{sub 2}. At Farnham Dome, Utah, and Springerville-St. Johns, Arizona, proven CO{sub 2} reservoirs occur at 600-800 m depth, but no anomalous soil gas CO{sub 2} flux was detected. Background CO{sub 2} fluxes of up to about 5 g m{sup -2} day{sup -1} were common in arid, poorly vegetated areas, and fluxes up to about 20 g m{sup -2} day{sup -1} were found at Springerville-St. Johns in heavily vegetated, wet ground adjacent to springs. These elevated fluxes are attributed to shallow root zone activity rather than to a deep upflow of CO{sub 2}. Localized areas of anomalously high CO{sub 2} gas flux ({approx} 100 g m{sup -2} day{sup -1}) were documented along the Little Grand Wash Fault Zone near Crystal Geyser, Utah and nearby in Ten Mile Graben, but those in Ten Mile Graben are not directly associated with the major faults. In both areas, features with a visible gas flux are present. Isotopic measurements on the CO{sub 2} gas confirm that it originated at depth. Evidence of widespread vein calcite at the surface at Farnham Dome and travertine deposits in the other …
Date:
February 8, 2005
Creator:
Allis, R.G.; Moore, J. & White, S.
Object Type:
Report
System:
The UNT Digital Library
Congressional Gifts and Travel, Legislative Proposals for the 109th Congress
The House and Senate examined their rules on the acceptance of gifts and travel expenses. Press accounts of alleged excesses in privately funded congressional travel and gifts, particularly from lobbyists, have provided an impetus for proposed changes in the 109th Congress. This report provides an analysis of the proposals for change introduced or discussed in the 109th Congress and will be updated as events warrant.
Date:
November 8, 2005
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Angularly resolved measurements of ion energy of vacuum arc plasmas
None
Date:
April 8, 2005
Creator:
Anders, Andre & Yushkov, George Yu.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 106, No. 261, Ed. 1 Tuesday, February 8, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 8, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 285, Ed. 1 Tuesday, March 8, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 8, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 7, Ed. 1 Friday, April 8, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 8, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 32, Ed. 1 Sunday, May 8, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 8, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 58, Ed. 1 Wednesday, June 8, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 8, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 83, Ed. 1 Friday, July 8, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 8, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 109, Ed. 1 Monday, August 8, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 8, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 136, Ed. 1 Thursday, September 8, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 8, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The United States and Europe: Possible Options for U.S. Policy
None
Date:
March 8, 2005
Creator:
Archick, Kristin
Object Type:
Report
System:
The UNT Digital Library
Status of the Yucca Mountain Project, License Application, and Repository Design Update
None
Date:
March 8, 2005
Creator:
Artur, W. John, III
Object Type:
Presentation
System:
The UNT Digital Library
Measurement of Branching Fraction and CP-Violating Asymmetry for B-> omega K0s
The authors present a preliminary measurement of the branching fraction and CP-violating parameters S and C for the decay B{sup 0} {yields} {omega}K{sub S}{sup 0}. The data sample corresponds to 232 x 10{sup 6} B{bar B} pairs produced from e{sup +}e{sup -} annihilation at the {Upsilon}(4S) resonance. They measure {Beta}(B{sup 0} {yields} {omega}K{sup 0}) = (5.9 {+-} 1.0 {+-} 0.4) x 10{sup -6}, S = 0.50{sub -0.38}{sup +0.34} {+-} 0.02 and C = -0.56{sub -0.27}{sup +0.29} {+-} 0.03.
Date:
June 8, 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
Least-Squares Wave-Front Reconstruction of Shack-Hartmann Sensors and Shearing Interferometers using Multigrid Techniques
None
Date:
February 8, 2005
Creator:
Baker, K L
Object Type:
Article
System:
The UNT Digital Library
Abandoned Mine Land Fund Reauthorization: Selected Issues
This report provides a summary of the structure of the Abandon Mine Land (AML) program, distribution of funds, and discusses major proposals considered in the 108th Congress.
Date:
March 8, 2005
Creator:
Bamberger, Robert L.
Object Type:
Report
System:
The UNT Digital Library
Aggregation kinetics in a model colloidal suspension
The authors present molecular dynamics simulations of aggregation kinetics in a colloidal suspension modeled as a highly asymmetric binary mixture. Starting from a configuration with largely uncorrelated colloidal particles the system relaxes by coagulation-fragmentation dynamics to a structured state of low-dimensionality clusters with an exponential size distribution. The results show that short range repulsive interactions alone can give rise to so-called cluster phases. For the present model and probably other, more common colloids, the observed clusters appear to be equilibrium phase fluctuations induced by the entropic inter-colloidal attractions.
Date:
August 8, 2005
Creator:
Bastea, S
Object Type:
Article
System:
The UNT Digital Library
Positron Collection in Linear Collider
In the Linear Collider design, the positron capture system includes a positron production target, followed by an adiabatic matching device (solenoid), a pre-linac with solenoidal focusing, and a linac with quadrupole focusing before injection into a positron damping ring. Two schemes for positron production have been studied: (1) a conventional approach with high-energy electron beam interacting with a high-Z target and (2) polarized positron production using polarized photons generated in a helical undulator by a primary collider electron beam which then interact with a positron production target. The capture efficiencies for both schemes are compared. Various parameters affecting the positron capture are analyzed.
Date:
December 8, 2005
Creator:
Batygin, Y. K.
Object Type:
Article
System:
The UNT Digital Library