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Showing 1 to 16 of 16 for “"Electromagnetic Form Factors"”.
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Off-shell pion electromagnetic form factors in chiral perturbation theory
The electromagnetic form factors of the pion play a role in investigations of various electromagnetic interactions. We calculate the off-shell pion form factors using chiral perturbation theory, which is the effective theory for QCD at low energies. Chiral perturbation theory has previously been …
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Electromagnetic Form Factors of Hadrons in the Space-Like Region
… degrees of freedom in the strong force form together into complex bound states called hadrons, rather than appearing as free particles. Thus the study of the strong force becomes the study of hadrons and their structure. One way we may study the structure of these composite bound states …
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Lorentz contraction effects in the electromagnetic form factors of relativistic two-body bound systems
Relativistic effects in the electromagnetic form factors of a two-body bound system are discussed by examining specific examples in detail. The wave function for the two-body bound system is calculated from the Bethe-Salpeter equation and inserted into form factor expressions for scalar and vector …
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A precision measurement of the transverse asymmetry AT̳' from quasi-elastic ³sHe [right arrow] (e [right arrow], e') process and the neutron magnetic form factor Gn̳m̳ at low Q²
Electromagnetic form factors are fundamental quantities in describing the underlying electromagnetic structure of nucleons. While proton electromagnetic form factors have been determined with good precision, neutron form factors are known poorly, largely due to the lack of free neutron targets. …
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Proton form factors in large NcQCD
The proton electromagnetic form factors are obtained using a particular model formula of QCDoo , QCD in the large Nc limit, which sums up the infinite number of zero-width resonances to produce an Euler's Beta function, Dual-QCDoo . The form factors F} (q2), F2(q2) and GM(q2) altogether …
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A variational approach to hadron structure in lattice QCD
… standard perturbative methods ineffective. The formulation of QCD on a discrete space-time lattice allows for a first principles, non-perturbative approach to studying the strong interaction, in a manner well suited to numerical computation. Over the past decade, the use of variational …
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The neutron electric form factor to Q² = 1.45 (GeV/c)²
The nucleon elastic electromagnetic form factors are fundamental quantities needed for an understanding of nucleon and nuclear electromagnetic structure. The evolution of the Sachs electric and magnetic form factors with Q2, the square of the four-momentum transfer, is related to the distribution …
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Measuring the lepton sign asymmetry in elastic electron-proton scattering with OLYMPUS
… the discrepancy in measurements of the proton's electromagnetic form factors. Alternating electron and positron beams, accelerated to 2 GeV, were directed through a windowless, gaseous, hydrogen target, and the scattered lepton and recoiling proton were detected in coincidence using a large …
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Electroweak Structure of Three-and Four-Body Nuclei
<p>This work reports results for (i) the elastic electromagnetic form factors of the trinucleons; (ii) the nuclear response functions of interest in [<em>e</em> → <em>e'</em>] experiments, at excitation energies below the deuteron breakup threshold; (iii) the astrophysical <em>S</em>-factor for …
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Relativistic Hamiltonians and short range structure of nuclei
… and simple explanations of the structure and electromagnetic form factors of the deuteron. In the second part, relativistic effects are studied using a relativistic Hamiltonian defined as the sum of relativistic one-body kinetic energy, two- and three-body potentials and their boost …
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Recoil polarization measurements of the proton electromagnetic form factor ratio to high momentum transfer
The electromagnetic form factors of the nucleon characterize the effect of its internal structure on its response to an electromagnetic probe as studied in elastic electronnucleon scattering. These form factors are functions of the squared four-momentum transfer Q2 between the electron and the …
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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)
… 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 (<em>Q</em>²)=5.6 GeV². The two photon …
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Relativistic Hamiltonians and Short-Range Structure of Nuclei
… and simple explanations of the structure and electromagnetic form factors of the deuteron. In the second part, relativistic effects are studied using a relativistic Hamilionian defined as the sum of relativistic one-body kinetic energy, two- and three-body potentials and their boost …
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Use of simple-harmonic forces in the non-relativistic quark model
… to about 2 GeV, and such an investigation is performed. The model is then used to estimate the radiative widths of the observed N* resonances, In the ""second resonance region"" of pion photoproduction, both the Sll(1550) and D13(1525) resonances (and possibly the Dll(1470), depending on what …
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Lattice QCD calculations of Kl3 and pion form factors using partially twisted boundary conditions
… K → π semi-leptonic (K<sub>l3</sub>) and pion electromagnetic form factors using partially twisted boundary conditions. These form factors parameterize low-energy-non-perturbative strong interaction effects and cannot therefore be calculated in perturbative QCD. The pion electromagnetic form …
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A Study of the Λ(1405) in Lattice QCD
… then build on this result by investigating their electromagnetic properties, and show that the strange quark contribution to the magnetic form factor for the Λ(1405) near-vanishes in the physical limit. Together with a Hamiltonian effective field theory model analysis of the lattice QCD energy …