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Contributions of loops with dynamical vector mesons to masses and decay constants of pseudoscalar mesons and their quark mass dependence
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
(English)Manuscript (preprint) (Other academic)
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-281893OAI: oai:DiVA.org:uu-281893DiVA: diva2:915749
Available from: 2016-03-30 Created: 2016-03-30 Last updated: 2016-04-29
In thesis
1. Theoretical Studies of Hadronic Reactions with Vector Mesons
Open this publication in new window or tab >>Theoretical Studies of Hadronic Reactions with Vector Mesons
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Aiming at a systematic inclusion of pseudoscalar and vector mesons as active degrees of freedom in an effective Lagrangian, studies have been performed in this thesis concerning the foundations of such an effective Lagrangian as well as tree-level and beyond-tree-level calculations. Hereby, vector mesons are described by antisymmetric tensor fields.

First, an existing power counting scheme for both pseudoscalar and vector mesons is extended to include the pseudoscalar-meson singlet in a systematic way. Based on this, tree-level calculations are carried out which are in good agreement with the available experimental data and several processes are predicted. In particular, the ω-π0 transition form factor is in better agreement with experimental data than the prediction done in the vector-meson-dominance model. Furthermore, a Lagrangian with vector mesons is used together with the leading contributions of chiral perturbation theory in order to calculate tree-level reactions in the sector of odd intrinsic parity. It turns out that both the Lagrangian with vector mesons and the Lagrangian of chiral perturbation theory are needed to describe experimental data.

Additionally, a feasibility check for one-loop calculations with pseudoscalar and vector mesons in the loop is performed. Thereby, only a limited number of interaction terms in the Lagrangian with vector mesons is used. The results are used to both renormalise the low-energy constants of chiral perturbation theory up to chiral order Q4 and to determine the influence of loops with vector mesons on masses and decay constants of pseudoscalar mesons.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. 63 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1361
Keyword
Hadron physics, Vector mesons, Effective field theories, Chiral Lagrangian, Meson-meson interactionss
National Category
Subatomic Physics
Research subject
Physics with specialization in Nuclear Physics
Identifiers
urn:nbn:se:uu:diva-281288 (URN)978-91-554-9532-9 (ISBN)
Public defence
2016-05-19, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2016-04-26 Created: 2016-03-22 Last updated: 2016-04-29

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Terschlüsen, Carla

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