Name: Anja Habersetzer: Tau Vector and Axial Vector Spectral Functions in the Extended Linear Sigma Model
Start: 2014-10-14T14:00:00+02:00
End: 2014-10-14T15:00:00+02:00
Location: Tanacsterem

Description

The extended Linear Sigma Model (eLSM) describes scalar, pseudoscalar, vector and axial-vector meson resonances, the glueball, and the tetraquark, as well as baryons, on the basis of a Lagrangian that is invariant under global chiral symmetry transformations and dilatation. In addition, for N_F=2, we have now included the electroweak interaction on the basis of a local SU(2)_L x U(1)_Y symmetry. Thus we have all components available to compute the coherent amplitudes that yield the vector and axial-vector spectral functions of the weak tau-decay with intermediate a_1 and rho resonances. We find that within the framework of the eLSM the assumption that the rho and a_1 meson resonances are quarkonia and chiral partners is valid. We will also see that the obtained weak spectral functions give a nice illustration of Vector Meson Dominance in the weak sector of meson vacuum phenomenology.