The Strangeness Form Factors of the Nucleon Form Lattice QCD
Author | : Jonas Wilhelm |
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Total Pages | : |
Release | : 2019 |
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Author | : Jonas Wilhelm |
Publisher | : |
Total Pages | : |
Release | : 2019 |
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ISBN | : |
Author | : Jonas Wilhelm |
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Release | : 2019 |
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Author | : CSSM and QCDSF/UKQCD Collaborations |
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Total Pages | : 8 |
Release | : 2014 |
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Author | : Thomas Wurm |
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Release | : 2016 |
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Total Pages | : 10 |
Release | : 2001 |
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Release | : 2007 |
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The progress in lattice QCD, especially the capacity to calculate at ever lower quark masses, combined with modern techniques of chiral extrapolation, means that one can now determine the strange quark contribution to the vector form factors of the nucleon with remarkable precision. We review these recent landmark calculations and compare them with the most recent global analysis of the experimental situation using parity violating electron scattering.
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Release | : 2005 |
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We explore the possibility of extrapolating state of the art lattice QCD calculations of nucleon form factors to the physical regime. We nd that the lattice results can be reproduced using the Light Front Cloudy Bag Model by letting its parameters be analytic functions of the quark mass. We then use the model to extend the lattice calculations to large values of Q2 of interest to current and planned experiments. These functions are also used to dene extrapolations to the physical value of the pion mass, thereby allowing us to study how the predicted zero in GE(Q2)/GM(Q2) varies as a function of quark mass.
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Release | : 2005 |
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We explore the possibility of extrapolating state of the art lattice QCD calculations of nucleon form factors to the physical regime. We find that the lattice results can be reproduced using the Light Front Cloudy Bag Model and the Extended Gari-Krmpelmann Model by letting their parameters be analytic functions of the quark mass. We then use the models to extend the lattice calculations to large values of Q2 of interest to current and planned experiments. These functions for the first model are also used to define extrapolations to the physical value of the pion mass, thereby allowing us to study how the predicted zero in G{sub E}(Q2)/G{sub M}(Q2) varies as a function of quark mass.
Author | : Jiayu Hua |
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Release | : 2017 |
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Author | : Phiala Elisabeth Shanahan |
Publisher | : Springer |
Total Pages | : 224 |
Release | : 2016-05-11 |
Genre | : Science |
ISBN | : 3319314386 |
This thesis discusses two key topics: strangeness and charge symmetry violation (CSV) in the nucleon. It also provides a pedagogical introduction to chiral effective field theory tailored to the high-precision era of lattice quantum chromodynamics (QCD). Because the nucleon has zero net strangeness, strange observables give tremendous insight into the nature of the vacuum; they can only arise through quantum fluctuations in which strange–antistrange quark pairs are generated. As a result, the precise values of these quantities within QCD are important in physics arenas as diverse as precision tests of QCD, searches for physics beyond the Standard Model, and the interpretation of dark matter direct-detection experiments. Similarly, the precise knowledge of CSV observables has, with increasing experimental precision, become essential to the interpretation of many searches for physics beyond the Standard Model. In this thesis, the numerical lattice gauge theory approach to QCD is combined with the chiral perturbation theory formalism to determine strange and CSV quantities in a diverse range of observables including the octet baryon masses, sigma terms, electromagnetic form factors, and parton distribution functions. This thesis builds a comprehensive and coherent picture of the current status of understanding of strangeness and charge symmetry violation in the nucleon.