Lorentz-Violating Gravitoelectromagnetism,
2010
Embry-Riddle Aeronautical University
Lorentz-Violating Gravitoelectromagnetism, Quentin G. Bailey
Physics & Astronomy - Prescott
The well-known analogy between a special limit of general relativity and electromagnetism is explored in the context of the Lorentz-violating standard-model extension. An analogy is developed for the minimal standard-model extension that connects a limit of the CPT-even component of the electromagnetic sector to the gravitational sector. We show that components of the post-Newtonian metric can be directly obtained from solutions to the electromagnetic sector. The method is illustrated with specific examples including static and rotating sources. Some unconventional effects that arise for Lorentz-violating electrostatics and magnetostatics have an analog in Lorentz-violating post-Newtonian gravity. In particular, we show that even …
Correlations In Proton-Proton Collisions At The Lhc,
2010
University of Tennessee, Knoxville
Correlations In Proton-Proton Collisions At The Lhc, The Cms Collaboration
Physics and Astronomy Publications and Other Works
Results on two-particle angular correlations for charged particles emitted in proton proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range of pseudo-rapidity (h) and azimuthal angle (f). Short-range correlations in Dh, which are studied in minimum bias events, are characterized using a simple “independent cluster” parametrization in order to quantify their strength (cluster size) and their extent in h (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 nb^-1 data set …
Measurement Of The Mass Of The Top Quark In ℯμ + Jets Final States At Dø With 5.3 Fb⁻¹,
2010
Southern Methodist University
Measurement Of The Mass Of The Top Quark In ℯμ + Jets Final States At Dø With 5.3 Fb⁻¹, The Dø Collaboration, Peter Renkel, Yuriy Ilchenko, Robert Kehoe, Jason South, Huanzhao Liu
Journal of Undergraduate Research
No abstract provided.
Phenomenology Of Heterotic String Theory: With Emphasis On The B-L/Ew Hierarchy,
2010
University of Pennsylvania
Phenomenology Of Heterotic String Theory: With Emphasis On The B-L/Ew Hierarchy, Michael Ambroso
Publicly Accessible Penn Dissertations
E8 x E8 heterotic string and M-theory, when appropriately compactified, can give rise to realistic, N = 1 supersymmetric particle physics. In particular, the exact matter spectrum of the MSSM is obtained by compactifying on Calabi-Yau manifolds admitting specific SU(4) vector bundles. These "heterotic standard models" have the SU(3)C x SU(2)L x U(1)Y gauge group of the standard model augmented
Ads/Cft Correspondence And Hydrodynamics Of Relativistic Heavy Ion Collisions,
2010
University of Tennessee - Knoxville
Ads/Cft Correspondence And Hydrodynamics Of Relativistic Heavy Ion Collisions, James Ethan Alsup
Doctoral Dissertations
The experiments performed at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Lab have discovered a state of matter called the strongly coupled quark-gluon plasma (sQGP). The strong coupling has limited the ability of the standard theory to describe such matter, namely Quantum Chromodynamics (QCD). However, string theory's anti-de Sitter/conformal field theory (AdS/CFT) correspondence has provided a new way to study the situation and in an analytical manner. So far, hydrodynamic properties of RHIC's plasma, such as elliptic flow and longitudinal expansion, have been seen to follow from classical supergravity calculations. In this dissertation I discuss some of the …
A Suggested Building Block Geometry Without Continuous Radial Joints Of Possible Relevance For Particle Detectors,
2010
Technological University Dublin
A Suggested Building Block Geometry Without Continuous Radial Joints Of Possible Relevance For Particle Detectors, Jim Mcgovern
Articles
A geometry for concentrc shells or tubes, built-up from a single rhombohedral block type, is described. Continuous radial joints are avoided.
Cms Tracking Performance Results From Early Lhc Operation,
2010
University of Tennessee, Knoxville
Cms Tracking Performance Results From Early Lhc Operation, The Cms Collaboration
Physics and Astronomy Publications and Other Works
The first LHC pp collisions at centre-of-mass energies of 0.9 and 2.36 TeV were recorded by the CMS detector in December 2009. The trajectories of charged particles produced in the collisions were reconstructed using the all-silicon Tracker and their momenta were measured in the 3.8 T axial magnetic field. Results from the Tracker commissioning are presented including studies of timing, efficiency, signal-to-noise, resolution, and ionization energy. Reconstructed tracks are used to benchmark the performance in terms of track and vertex resolutions, reconstruction of decays, estimation of ionization energy loss, as well as identification of photon conversions, nuclear interactions, and heavy-flavour …
Observation Of The First Bs--> J/Psi Phi Event In Cms,
2010
University of Tennessee - Knoxville
Observation Of The First Bs--> J/Psi Phi Event In Cms, Stefan M Spanier, Giordano Cerizza
Physics and Astronomy Publications and Other Works
Presentation for the International Conference on High Energy Physics, July 2010, Paris, France. The first reconstructed decay of a Bs particle in CMS that is relevant for finding information to explain the matter anti-matter asymmetry in the Universe.
Feasibility And Conceptual Design Of A C.W. Positron Source At Cebaf,
2010
Old Dominion University
Feasibility And Conceptual Design Of A C.W. Positron Source At Cebaf, Serkan Golge
Physics Theses & Dissertations
A feasibility study of a CW positron source for the 12 GeV upgrade at Jefferson Lab (JLAB) is provided. The proposed ≥ 100 nA Continuous Wave (CW) positron source at JLAB has several unique and challenging characteristics: high current incident electron beam at 126 MeV with a high beam power (up to a MW); CW e−beam and CW e+ production. The multiple scattering is a dominant process when creating e+ in a target, which results a large phase space area of the emitted positrons. An admittance study was done at CEBAF to find the maximum phase space area, which is …
The Combined Effects Of Radio Frequency And Gamma Irradiation On P-Channel Mosfets,
2010
Air Force Institute of Technology
The Combined Effects Of Radio Frequency And Gamma Irradiation On P-Channel Mosfets, Joshua D. Daniel
Theses and Dissertations
The purpose of this research was to investigate the combined effects of continuous gigahertz radio frequency signals and gamma irradiation on the threshold voltage of metal oxide semiconductor field effect transistors. The combined effects of gigahertz radio frequency waves and gamma irradiation on electronics presents a new challenge in electronic warfare and little is known of the combined effect on threshold voltage damage and recovery. The Fairchild NDS352AP, a commonly used commercial device, was irradiated by a cobalt-60 source under a +5 V bias with and without a radio frequency signal applied to the gate. The threshold voltage was measured …
From Surface Operators To Non-Abelian Volume Operators In Puff Field Theory,
2010
Harvey Mudd College
From Surface Operators To Non-Abelian Volume Operators In Puff Field Theory, Vatche Sahakian
All HMC Faculty Publications and Research
Puff field theory (PFT) is a low energy decoupling regime of string theory that still retains the nonlocal attributes of the parent theory—while preserving isotropy for its nonlocal degrees of freedom. It realizes an extended holographic dictionary at strong coupling and dynamical nonlocal states akin to defects or the surface operators of local gauge theories. In this work, we probe the nonlocal features of PFT using D3 branes. We find supersymmetric configurations that end on defects endowed with non-Abelian degrees of freedom. These are 2+1 dimensional defects in the 3+1 dimensional PFT that may be viewed as volume operators. We …
Search For The Production Of The Standard Model Z Boson In Association With W Boson In Proton Anti-Proton Collisions At 1.96 Tev Center Of Mass Energy,
2010
University of Pennsylvania
Search For The Production Of The Standard Model Z Boson In Association With W Boson In Proton Anti-Proton Collisions At 1.96 Tev Center Of Mass Energy, Justin Keung
Publicly Accessible Penn Dissertations
The search for the production of the Standard Model Z boson in association with a W boson is motivated and discussed. This is performed using 4.3/fb of Tevatron Run II data collected with the CDF detector in sqrt(s) = 1.96 TeV proton anti-proton collisions. This is a signature-based analysis where the W boson decays semileptonically into a high-pT electron or muon plus a neutrino, and where the Z boson decays into two b quark jets (b-jets). We increase the signal-to-background ratio by identifying the b-quarks in the jets with a new neural network-based algorithm. Another neural network then uses kinematic …
Search For The Standard Model Higgs Boson In P-Pbar Interactions With The Decay Mode H -> W+ W- -> Mu+ Nu Mu- Nu At The D0 Experiment,
2010
University of Nebraska at Lincoln
Search For The Standard Model Higgs Boson In P-Pbar Interactions With The Decay Mode H -> W+ W- -> Mu+ Nu Mu- Nu At The D0 Experiment, Dale M. Johnston
Theses, Dissertations, and Student Research: Department of Physics and Astronomy
A search for the standard model Higgs boson in p-pbar collisions resulting in two muons and large missing transverse energy is presented. The analysis uses 4.2 fb-1 of integrated luminosity at a center-of-mass energy of sqrt(s) = 1.96 TeV collected between April 2002 and December 2008 with the D0 detector at the Fermilab Tevatron collider. No significant excess above the background estimation is observed and limits are derived on Higgs boson production.
Beyond The Born Approximation: A Precise Comparison Of E+P And E-P Elastic Scattering In The Cebaf Large Acceptance Spectrometer (Clas),
2010
Old Dominion University
Beyond The Born Approximation: A Precise Comparison Of E+P And E-P Elastic Scattering In The Cebaf Large Acceptance Spectrometer (Clas), Megh Raj Niroula
Physics Theses & Dissertations
How well we know the structure of the proton depends on our knowledge of the form factors of the proton. The ratio of the electromagnetic form factors of the proton measured by the Rosenbluth and the polarization transfer methods differ by a factor of 3 at four momentum transfer squared (Q²)=5.6 GeV². The two photon exchange (TPE) effect is the leading candidate to explain this discrepancy. The theoretical estimates of the TPE effect are model dependent so precise measurement is required to resolve this problem. The TPE effect can be measured in a model independent way by measuring …
Exclusive Π- Electro-Production From The Neutron In The Resonance Region,
2010
Old Dominion University
Exclusive Π- Electro-Production From The Neutron In The Resonance Region, Jixie Zhang
Physics Theses & Dissertations
The study of baryon resonances is crucial to our understanding of nucleon structure. Although the excited states of the proton have been studied in great detail, there are very few data available for the neutron resonances because of the difficulty inherent in obtaining a free neutron target. To overcome this limitation, the spectator tagging technique was used in one of the CEBAF Large Acceptance Spectrometer (CLAS) collaboration experiments, Barely off-shell Nuclear Structure (BoNuS), in Hall-B at Jefferson Lab. We have constructed a radial time projection chamber (RTPC) based on the gaseous electron multiplier (GEM) technology to detect low momentum …
Lorentz Violation With An Antisymmetric Tensor,
2010
University of South Carolina
Lorentz Violation With An Antisymmetric Tensor, Brett Altschul, Quentin G. Bailey, V. Alan Kostelecký
Physics & Astronomy - Prescott
Field theories with spontaneous Lorentz violation involving an antisymmetric 2-tensor are studied. A general action including nonminimal gravitational couplings is constructed, and features of the Nambu- Goldstone and massive modes are discussed. Minimal models in Minkowski spacetime exhibit dualities with Lorentz-violating vector and scalar theories. The post-Newtonian expansion for nonminimal models in Riemann spacetime involves qualitatively new features, including the absence of an isotropic limit. Certain interactions producing stable Lorentz-violating theories in Minkowski spacetime solve the renormalization-group equations in the tadpole approximation.
In-Situ, Gate Bias Dependent Study Of Neutron Irradiation Effects On Algan/Gan Hfets,
2010
Air Force Institute of Technology
In-Situ, Gate Bias Dependent Study Of Neutron Irradiation Effects On Algan/Gan Hfets, Janusz K. Mikina
Theses and Dissertations
AlGaN/GaN Heterostructure Field Effect Transistors (HFETs) have come under increased study in recent years due to their highly desirable material and electrical properties and survivability even during and after exposure to extreme temperature and radiation environments. In this study, unpassivated and SiN passivated Al0.27Ga0.73N/GaN HFETs were subjected to neutron radiation at 120 K. The primary focus of the research was the effects of neutron irradiation on drain current, gate leakage current, threshold voltage shift, gate-channel capacitance, and the effects of biasing the gate during irradiation. In-situ measurements were conducted on transistor current, gate-channel capacitance, and gate …
Thermal Neutron Point Source Imaging Using A Rotating Modulation Collimator (Rmc),
2010
Air Force Institute of Technology
Thermal Neutron Point Source Imaging Using A Rotating Modulation Collimator (Rmc), Nathan O. Boyce
Theses and Dissertations
This thesis demonstrates a previously untested capability of the Rotating Modulation Collimator (RMC) to image a point-like neutron source. The encouraging results, achieved using low-energy neutrons, provide motivation for further refinement and continued research with higher-energy neutrons. The detector and the masks on an existing RMC imaging system were exchanged to function with neutrons. The source in this research produced a poly-energetic spectrum of neutrons through the reaction. The source of alpha particles was a 72.7 mCi 239Pu source. The RMC detector was located 250 cm from the bare source and operated for three hours to generate a modulation …
Positron Annihilation Ratio Spectroscopy (Psars) Applied To Positronium Formation Studies,
2010
Air Force Institute of Technology
Positron Annihilation Ratio Spectroscopy (Psars) Applied To Positronium Formation Studies, Robert C. Slaughter
Theses and Dissertations
A Positron Annihilation of Radiation Spectrometer (PsARS) was developed and characterized. PsARS spectroscopy as well as digital Positron Annihilation Lifetime Spectroscopy (PALS) was applied to measure positronium formation on gold nanoparticles deposited through an evaporative method onto a thin capillary tube. This gold coated capillary tube was designed to be used for positronium lifetime studies in local electric field experiments. High local electric fields can polarize a positron-electron pair, which may result in an extended lifetime of the positron. These fields may be created through the interaction of an external electric field with silver nanoparticles deposited onto the surface of …
High-Energy Amplitudes In N= 4 Sym In The Next-To-Leading Order,
2010
Old Dominion University
High-Energy Amplitudes In N= 4 Sym In The Next-To-Leading Order, Ian Balitsky, Giovanni A. Chirilli
Physics Faculty Publications
The high-energy behavior of the N = 4 SYM amplitudes in the Regge limit can be calculated order by order in perturbation theory using the high-energy operator expansion in Wilson lines. At large Nc , a typical four-point amplitude is determined by a single BFKL pomeron. The conformal structure of the four-point amplitude is fixed in terms of two functions: pomeron intercept and the coefficient function in front of the pomeron (the product of two residues). The pomeron intercept is universal while the coefficient function depends on the correlator in question. The intercept is known in the first two orders …
