Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 13: Poster Session: Theory

HK 13.8: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

Isospin breaking and nucleon structure — •Tobias Gail and Thomas R. Hemmert — Physik Department Technische Universität München

We study the three vector and three axial vector weak form factors of the nucleon including isospin breaking effects in the pion and nucleon sector, using both the heavy baryon and the relativistic approach of SU(2) chiral perturbation theory to O(p³). Two of these form factors have not been considered previously in these frameworks, since they parametrize second class currents, currents of unnatural G-parity. We discuss the implications of isospin breaking on low energy neutrino nucleon scattering and ordinary muon capture. Consequences of isospin violation for the unitarity of the CKM matrix are also discussed.
This work has been supported in part by BMBF, DFG and GSI.