Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 81: Hadron Structure and Spectroscopy II

HK 81.6: Talk

Friday, March 20, 2009, 12:15–12:30, H-ZO 30

Vector meson form factors on the lattice — •Martin Gürtler and Philipp Hägler — TU München

We compute form factors of vector mesons in lattice QCD. We use the QCDSF gauge field configurations with two dynamical flavors of non-perturbatively improved Wilson fermions.

In contrast to, e.g., the physical rho-meson, the vector mesons are stable on the lattice in the parameter ranges (pion masses and volumes) we consider.

Nevertheless, the results are examplary for form factors of spin-1 particles, and can be compared to results for pion and nucleon form factors.

We will present results for the electromagnetic form factors that allow to derive the charge radius and the g-factor of the rho meson, and also the quadrupole moment, which describes deviations from the spherical shape of the meson.

We also present first results for axial vector form factors.