Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 59 for “"Elementary Particles and Fields and String Theory"”.
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Multiple Dalitz Plot Analysis At Cleo-C
<p>Dalitz Plot analysis is a standard technique for the study of weak hadronic 3-body decays. This technique allows us to extract the relative amplitudes, phases, and fit fractions of the resonances that are the primary product of such decays. A Dalitz analysis is complicated by the presence of two …
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Low Energy Search For Physics Beyond The Standard Model
… discussion of the theoretical aspects of the Standard Model we point out experimental observations that can not be answered within its framework. Methods for the inderect detection of the heavy (electroweak scale and above) and light New Physics particles are discussed. Study of the meson mixing …
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Measurement of Inclusive Isolated Prompt Photon Production at √s = 7 TeV with the ATLAS Detector
… of perturbative quantum chromodynamics (pQCD), and are also found in signatures of new physics. A precise measurement of prompt photon production is both a useful test of theoretical models as well as an important step towards understanding final states that contain energetic photons. This …
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Design Of A High Luminosity 100 Tev Proton Antiproton Collider
… explored with the Large Hadron Collider at CERN and with Intensity Frontier programs at Fermilab and KEK. The energy scale for new physics is known to be in the multi-TeV range, signaling the need for a future collider which well surpasses this energy scale. A 10 34 cm-2 s-1 luminosity 100 TeV …
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Probing New Physics Through Third Generation Leptons
This dissertation is a study of beyond standard model physics or new physics. The third generation charged lepton -the τ -is an excellent probe of new physics (NP) because of it being the heaviest lepton. As the heaviest lepton, it has the largest coupling ( among the leptons) to the Higgs boson in …
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The Beam Dynamics And Beam Related Uncertainties In Fermilab Muon G-2 Experiment
… role in constraining physics beyond the Standard Model for many years. Currently, the Standard Model prediction for aμ is accurate to 0.42 parts per million (ppm). The most recent muon g-2 experiment was done at Brookhaven National Laboratory (BNL) and determined aμ to 0.54 ppm, with a …
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Final Muon Cooling For A Muon Collider
… so they produce less synchrotron radiation, and they behave like point particles. However, they have a short lifetime of 2.2 μs and the beam is more difficult to cool than an electron beam. The Muon Accelerator Program (MAP) was created to develop concepts and technologies required by a muon …
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Weak Decay Studies From An Effective Theory Standpoint
… theories. I discuss the soft photon contribution and background effect to the rare dimuonic decay of the neutral B meson. I also study some radiative exclusive W boson decays in the standard model in the context of pQCD and SCET. Additionally I invoke leptonic decays of charged mesons to constrain …
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Measurement of the Photon Beam Asymmetry in <i>γP</i> → <i>K</i><sup>+</sup>Σ<sup>0</sup> at <i>E<sub>γ</sub></i> = 8.5 GeV with GlueX
… asymmetries are measured as a function of the Mandelstam variable<em> t</em> and as a single value for the low <em>u</em> region. These are the first exclusive measurements of the photon beam asymmetry Σ in this reaction at energies above the baryon resonance region. For the <em>t</em>-channel, …
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Beam-Induced Radiation Heating on the Superconducting Undulator at the Advanced Photon Source
… mitigation of the radiation heating mechanism, and production of photoelectrons to seed an electron cloud was studied for this thesis. ^ An analytical model was developed to predict the radiation heat load on the SCU chamber. This model was benchmarked with ray tracings and simulations. Results …
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Spin Structure of the Deuteron
<p>Double spin asymmetries for the proton and the deuteron have been measured in the EG1b experiment using the CLAS detector at Jefferson Lab. Longitudinally polarized electrons at energies 1.6, 2.5, 4.2 and 5.7 GeV were scattered from longitudinally polarized NH3 and ND3 targets. The double spin …
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Precision Measurement of the Spin Structure of the Proton and the Deuteron
… the spin structure functions <em>g</em>1 and <em>g</em>2 of the proton and deuteron using deep inelastic scattering of 50 GeV polarized electrons from dynamically polarized, solid <sup>15</sup>NH<sub>3</sub> and <sup>6</sup>LiD targets. Three independent spectrometers, covering a large …
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A Relativistic Model for Heavy Mesons
… present interest in the heavy quark effective theory, we construct a model for heavy mesons based on a relativistic bound state wave equation, the Gross equation. The kernel we use is based on scalar confining and vector Coulomb potentials. Wave functions are treated to leading order and …
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A Search For The Sm Higgs Boson In The Process Zhllbb In 4.1/fb Of Cdf Ii Data
<p>This dissertation presents a search for the standard model (SM) Higgs boson in the associated production process ZH → l<sup>+</sup>l<sub>-</sub> bb using 4.1fb<sup>-1</sup> of Tevatron collision data collected with the CDF II detector.</p> <p>To increase the sensitivity to a ZH signal over …
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Measurement of the Upsilon(nS) cross section at CDF
… theories try to describe quarkonium production, and while these theories agree with experimental measurements of production rates, theoretical predictions for quarkonium polarization vary. Careful measurement of the ϒ(<em> nS</em>) angular distribution along with the ϒ(<em>nS</em>) cross section …
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Effects of energetic irradiation on materials and devices based on graphene and topological insulators
<p>This report focuses on the optical and electronic properties of graphene and topological insulators and how these Dirac fermion systems interact with energetic irradiation. We first present data exploring the effects of electron-beam and oxygen plasma induced disorder on the electronic …
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Exploring QCD Factorization at Moderate Energy Scales
… scheme to separate a process into perturbative and non-perturbative factors. This separation relies on an assumption that one energy scale is infinitely larger than the other scales involved in the process. However, much experimental research in areas such as nucleon structure and quark-hadron …
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The ²H(<i>e, e'p</i>)<i>n</i> Reaction at High Four-Momentum Transfer
… transfers, <em>Q</em><sup>2</sup> = 0.8, 2.1, and 3.5 GeV<sup>2</sup> and missing momenta, <em>p<sub>miss</sub></em> = 0, 100, 200, 300, 400, and 500 GeV including separations of the longitudinal-transverse interference response function, <em>R<sub>LT</sub></em>, and extraction of the …
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The Use of Operator Regularization in the Computation of Effective Field Theories
… a way to calculate any desired effective field theory avoiding the tediousness of previous methods. This technique is shown to be an effective method in explicitly calculating the 1<sub><em>/mheavy</em></sub> corrections that match an original full theory to its low-energy effective counterpart. …
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Measurement of Polarized Proton-Proton Elastic Scattering at the Relativistic Heavy Ion Collider (RHIC)
… one of the most fundamental processes in nature and yet, it is one of the most difficult to describe. There are two interactions involved in this process: electromagnetic (Coulomb) and hadronic (strong) interactions. Underlying exchange mechanisms of these two interactions are the virtual photon …
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