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 20 for “"Four-momentum transfer"”.
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The ²H(<i>e, e'p</i>)<i>n</i> Reaction at High Four-Momentum Transfer
<p>This dissertation presents the highest four-momentum transfer, <em>Q</em><sup>2</sup>, quasielastic (<em>x<sub>Bj</sub></em> = 1) results from Experiment E01-020 which systematically explored the 2H(<em>e, e'p</em>)<em>n</em> reaction ("Electro-disintegration" of the deuteron) at three different …
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Measurement of Virtual Compton Scattering Below Pion Threshold at Invariant Four-Momentum Transfer Squared Q²=1.(GEV/C)²
… Q<sup>2</sup> dependence of the GPs leads, by Fourier transform, to a description of the rearrangement of the charge and magnetization distributions. The VCS reaction γ* + <em>p</em> → <em>p</em> + γ was experimentally accessed through the reaction <em>e</em> + <em>p</em> → <em>e</em> + …
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Parity-Violating Elastic Electron Nucleon Scattering: Measurement of the Strange Quark Content of the Nucleon and Towards a Measurement of the Weak Charge of the Proton
… of the weak charge of the proton, at a four-momentum transfer, Q² ~ 0.026 GeV²/c². The precision of this measurement gives Q<sub>weak</sub> access to new physics at the scale of 2.3 TeV, making it a test of the standard model. The G⁰ experimental program provides the fully separated …
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The neutron electric form factor to Q² = 1.45 (GeV/c)²
… magnetic form factors with Q2, the square of the four-momentum transfer, is related to the distribution of charge and magnetization within the nucleon. High precision measurements of the nucleon form factors are essential for stringent tests of our current theoretical understanding of confinement …
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Measurement of fLT and fLT' response functions in the quasi-elastic ²H(e̳,e'p) reaction at 200 (MeV/c) missing momentum
… was placed at an angle of 37.270 and the energy transfer, w, was set for quasi-elastic kinematics with the square of the four-momentum transfer, Q2, equal to -0.22 (GeV/c) 2 . Three out-of-plane proton spectrometers (OOPS) were positioned at ... . This allowed the simultaneous measurement of fLT, …
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Charge Symmetry Violation Quark Distributions via Precise Measurement of π+/π− Ratios in Semi-inclusive Deep Inelastic Scattering
… with scattered electrons covering the four-momentum transfer of the virtual photon Q^2 from 4 to 5.5 GeV^2, the Bjorken variable x for 0.35-0.65, and the fraction of energy transfer carried by the outgoing pion z from 0.4-0.7.
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A study of the spin dependence of pion electroproduction near the [delta] region
… mass range of 1.1 to 1.4 GeV and a squared four momentum transfer range of 0.1 to 0.4 (GeV/c)2. By flipping the target spin direction and the electron beam helicity, the single- (beam only and target only) and double-spin (beam-target) asymmetries were constructed from the measured yields …
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Measurement of the Neutral Current Cross Section and Search for Contact Interactions with the H1 Experiment at HERA
… of neutral current events at large four-momentum transfer Q^2. The precise measurement of the scattered electron using solely calorimetric information is established. The single and double differential cross sections dsigma/dQ^2 and d^2sigma/dxdQ^2 are measured in the range of …
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Measurement of the Beam Asymmetry for the ETA and ETA Prime Mesons with the Gluex Experiment
… on a liquid hydrogen target and a nearly-four-pi hermetic detector capable of measuring positions and momenta of both charged and neutral final state particles generated in the target. The short-term physics goals of GlueX are to measure observables and properties of the known particles, …
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Recoil polarization measurements of the proton electromagnetic form factor ratio to high momentum transfer
… These form factors are functions of the squared four-momentum transfer Q2 between the electron and the proton. The two main classes of observables of this reaction are the scattering cross section and polarization asymmetries, both of which are sensitive to the form factors in different ways. …
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MEASUREMENT OF THE GENERALIZED POLARIZABILITIES OF THE PROTON IN VIRTUAL COMPTON SCATTERING
… the polarizabilities are generalized to finite momentum transfer, their Fourier transform can map out the spatial distribution of the polarization densities in a proton subject to an EM field. This thesis focuses on the measurement of the proton generalized polarizabilities (GPs) at low …
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Beyond the Born Approximation: A Precise Comparison of e+p and e-p Elastic Scattering in the CEBAF Large Acceptance Spectrometer (CLAS)
… measured by the Rosenbluth and the polarization transfer methods differ by a factor of 3 at four momentum transfer squared (<em>Q</em>²)=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 …
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Measurement of Polarized Proton-Proton Elastic Scattering at the Relativistic Heavy Ion Collider (RHIC)
… at the center-of-mass energy √s = 200 GeV in the four-momentum transfer squared <em>t</em> range 0.006 ≤ |<em>t</em>| ≤ 0.02 (GeV/c)<sup>2 </sup>. I also present data analysis techniques and Monte Carlo simulations developed for the analysis and improvement of the detector performance, correction …
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Single π° production in proton-proton interactions at 2.8 Bev/c
… study single π° production. The center-of-mass momentum distributions of the final state protons and pions have been found to be in generally good agreement with the theoretical predictions based upon the Isobar model. The distribution of the square of the four-momentum transfer to the target …
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Field Theoretic Models of Deep Inelastic Lepton-Nucleon Scattering
… large and fixed. (q is the electron four-momentum transfer and p the target nucleon momentum.) The leading logarithmic behavior of the ladder diagrams is obtained by Mellin transform techniques. Our results are: 1. The structure functions do not scale (i.e. become non-trivial …
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Measuring the Weak Charge of the Proton and the Hadronic Parity Violation of the N →Δ Transition
… elastic electron-proton scattering at low four momentum transfer to a precision of 4%. QpW has firm Standard Model prediction and is related to the weak mixing angle, sin20W, a well-defined Standard Model parameter. Qweak will probe a subset of new physics to the TeV mass scale and test the …
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Spin Dependence in Polarized Proton-Proton Elastic Scattering at RHIC
… at the center of mass energy √s= 200 GeV and four momentum transfer squared (<em>t</em>) range of 0.003 ≤ |<em>t</em>| ≤ 0.035 (GeV/<em>c</em>)<sup>2</sup>, where, due to the Coulomb Nuclear Interference (CNI), a measurable single spin asymmetry arises. While the electromagnetic interaction …
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Measurement of Generalized GDH Integrand for the Neutron and 3He at Low Q2
… the virtual photon absorption at an arbitrary four momentum transfer square ($Q^2$) and thus provides a unique relation to study the nucleon spin structure over an experimentally accessible range of $Q^2$. The measured integrals can be compared with theoretical predictions for the spin …
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Measurement of the Diffractive Structure Function of the Antiproton in Proton-Antiproton Collisions at √s = 1800 and 630 GeV
… In the kinematic region of antiproton fractional momentum loss 0.035 ≤ ξ ≤ 0.095, four-momentum transfer squared |t| ≤ 1.0 GeV² and β = x<sub>p̄</sub>/ξ < 0.5, where x<sub>p̄</sub> is the Bjorken scaling variable of the struck parton the antiproton, F<sub>jj</sub><sup>D</sup>(β, ξ) is found to …
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Measurement of fifth structure function in deuterium
… weighs 16 tons and is quite slender. It has a momentum resolution of 0.45%, a momentum acceptance of 10%, and a solid angle of 1.2 msr. It is well suited to access a wide range of out-of-plane angles and is capable of performing high precision coincidence measurements on the nucleon and few …