Isospin Breaking in Kaon Decays to Pions

University dissertation from KFS AB

Author: Fredrik Borg; Lunds Universitet.; Lund University.; [2005]

Keywords: NATURVETENSKAP; NATURAL SCIENCES; termodynamik Elementary particle physics statistisk fysik gravitation relativitet kvantmekanik thermodynamics Matematisk och allmän teoretisk fysik Pseudo-scalar meson Isospin Breaking Chiral Perturbation Theory Mathematical and general theoretical physics classical mechanics quantum mechanics relativity gravitation statistical physics Weak Interaction Strong Interaction kvantfältteori High energy interactions Kärnfysik Nuclear physics klassisk mekanik quantum field theory cosmic rays Kosmisk strålning högenergi Elementarpartikelfysik;

Abstract: The five different K -> 3 Pi and the three K -> 2 Pi decays are calculated in Chiral Perturbation Theory. The calculation is done using different approximations, to study whether this changes the result significantly. First the isospin approximation is used. Discrepancies are then found between theory and experiment. Further calculations without the isospin approximation are then done to see if this solves the found problems. The purpose is two-fold. To test the validity of Chiral Perturbation Theory and to fix some of the unknown parameters in the theory.

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