Axial-Vector Currents and Chiral Symmetry
Ubbi Sauerwein
Abstract
Open-access reader
Ubbi Sauerwein
Abstract
Open-access reader
In this work we consider the axial-vector form factors of the nucleon in flavor-SU(2) and of the baryon octet in flavor-SU(3) Chiral Perturbation Theory.We include the ∆-isobar and the baryon decuplet as explicit degrees of freedom and focus on their consistent treatment in terms of chiral power counting.We employ the use of on-shell meson and baryon masses in the one-loop contributions to the axial-vector form factors.The convergence properties of such an approach are scrutinized.Our results are compared to the available flavor-SU(2) QCD lattice data. AbstraktIn dieser Thesis betrachten wir die Axialvektor-Formfaktoren des Nukleons in Flavor-SU(2) und des Baryon Oktetts in Flavor-SU(3) chiraler St örungstheorie.Wir ber ücksichtigen das ∆-Isobar und das Baryon Dekuplett als explizite Freiheitsgrade mit besonderem Schwerpunkt auf deren konsistente Behandlung in Bezug auf das chirale Z ählschema.Wir verwenden On-Shell Meson-und Baryonmassen in den Ein-Schleifenbeitr ägen zu den Axialvektor-Formfaktoren.Die Konvergenzeigenschaften eines solchen Verfahrens werden detailliert analysiert.Unsere Resultate vergleichen wir mit den verf ügbaren Flavor-SU(2) QCD-Gitterdaten.
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In this work we consider the axial-vector form factors of the nucleon in flavor-SU(2) and of the baryon octet in flavor-SU(3) Chiral Perturbation Theory.We include the ∆-isobar and the baryon decuplet as explicit degrees of freedom and focus on their consistent treatment in terms of chiral power counting.We employ the use of on-shell meson and baryon masses in the one-loop contributions to the axial-vector form factors.The convergence properties of such an approach are scrutinized.Our results are compared to the available flavor-SU(2) QCD lattice data. AbstraktIn dieser Thesis betrachten wir die Axialvektor-Formfaktoren des Nukleons in Flavor-SU(2) und des Baryon Oktetts in Flavor-SU(3) chiraler St örungstheorie.Wir ber ücksichtigen das ∆-Isobar und das Baryon Dekuplett als explizite Freiheitsgrade mit besonderem Schwerpunkt auf deren konsistente Behandlung in Bezug auf das chirale Z ählschema.Wir verwenden On-Shell Meson-und Baryonmassen in den Ein-Schleifenbeitr ägen zu den Axialvektor-Formfaktoren.Die Konvergenzeigenschaften eines solchen Verfahrens werden detailliert analysiert.Unsere Resultate vergleichen wir mit den verf ügbaren Flavor-SU(2) QCD-Gitterdaten.
Key concepts: Chiral perturbation theory, Physics, Particle physics, Pseudovector, Baryon, Octet, Quantum chromodynamics, Lattice QCD