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Showing 1 to 20 of 150 for “"Form Factors"”.
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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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Gravitational form factors of hadrons from lattice QCD
The gravitational form factors (GFFs) of hadrons encode the matrix elements of the energy-momentum tensor of QCD. These quantities describe how energy, spin, and various mechanical properties of hadrons are carried by their quark and gluon constituents, and can be constrained using the framework of …
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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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Soft diffractive high energy scattering and form factors in nonperturbative QCD
… exchange. Furthermore we calculate the isovector form factors of the proton and the pion at space-like momentum transfers. In the final chapter we use a dispersion approach to calculate the pion form factor at time-like momentum transfers and determine the masses and coupling constants of the rho- …
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Quark and Gluon Form Factors at Three Loops in Perturbative QCD
We compute the quark and gluon form factors at up to three-loop order within massless perturbative Quantum Chromodynamics by studying the photon-quark-anti-quark vertex and the effective vertex of a Higgs boson and two gluons. We use Feynman diagram methods to derive expressions for the …
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Lattice QCD calculations of Kl3 and pion form factors using partially twisted boundary conditions
… (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 factor provides …
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B → K∗µ+µ− and Form Factors for Semi-Leptonic and Radiative B Decays
… which are studied in terms of the full form factors, calculated in QCD sum rules on the light-cone (LCSR), and QCD factorisation. Those with reduced dependence on hadronic quantities and sensitivity to NP are identified. In the first few years of data–taking at the LHC, the focus will be …
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Comparing Even Isotope Xenon Form Factors and Their Impact on Dark Matter Direct Detection
… Maleki for his thesis in 2017. Finally I use a form factor created from a numerical fit to scattering data to generate exclusion curves for even isotope Xenon. A difference of between 12% and 18% was found between these and exclusion curves generated using the standard Helm form factor.
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A Measurement Of The Isovector Axial And Strange Magnetic Form Factors Of The Nucleon
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-13T00:04:36Z No. of bitstreams: 1 Hasty.pdf: 3004447 bytes, checksum: b42256df626a4f85404b73d2d2f61ac0 (MD5)
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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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Improvements in Upper Limits of the Neutralino-Proton Cross Section through use of Model-Independent Nuclear Form Factors.
… one or two parameter model-dependent nuclear form factors, which may not exactly mirror the actual form factor for the particular nucleus in question. As is well known, elastic electron scattering can allow for very precise determinations of nuclear form factors and hence nuclear charge …
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Triple-GEM tracker and HCAL-J: two detectors for the study of Nucleon Form Factors at Jefferson Lab.
… the measurements of the electromagnetic Nucleons Form Factors; the SBS program will start data taking in September 2021. The present thesis work has focused on two key detectors of SBS: the GEM (Gas Electron Multiplier) based Front Tracker and the HCAL-J segmented hadron calorimeter. The latter is …
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Separation of the E2 and M1 form factors of the 6.32 MeV state of nitrogen-15 using (electron,electron'gamma)
… scattering. The two transverse multipole form factors (E2 and M1) were separated using a combined analysis of (e,e$\sp\prime$) and (e,e$\sp\prime\gamma$) data. This experiment is the first model independent separation of the multipoles that contribute to a mixed transition. Data were …
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Strange quark contributions to nucleon electric and magnetic form factors from parity-violating electron scattering asymmetries in the backward angle g0 experiment
… from the G0 forward angle measurement, the form factors which characterize the strange electric, strange magnetic and axial contributions were found to be G^{s}_{E}(0.221 GeV^2)= -0.0142305 +/- 0.035562 +/- 0.0181952 +/-0.0176497 G^{s}_{M}(0.221 GeV^2)=0.0833777 +/- 0.18337 +/- 0.0854892 +/- …
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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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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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Resonance contribution to electromagnetic structure functions
… functions is expressed in terms of transition form factors. Froissart-Gribov representations of the Compton amplitude partial waves are presented and are used to specify the spin dependence of the transition form factors. The dependence of the form factors on momentum transfer and resonance …
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Measurement of the electric form factor of the neutron at low momentum transfers using a vector polarized deuterium gas target at BLAST
Elastic form factors are fundamental quantities that characterize the electromagnetic structure of the nucleon. High precision measurements of these quantities are essential in understanding the structure of hadronic matter. Although the proton elastic form factors are well known, knowledge of the …
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