Seminar über aktuelle Frage der theoretischen Kernphysik

2.07.13 16:15

Lattice calculation of Ds → η(') semi-leptonic decay form factors

Issaku Kanamori (Regensburg)


We report lattice results of Ds meson semi-leptonic decay form factors to η and η' mesons.  Due to the mixing of η and η' these modes are relevant for flavor physics.  Our result is the first lattice calculation on these form factors.  The lattice calculation is challenging due to (computationally) expensive disconnected fermion loops.  These loops correspond to the weak annihilation diagram: Ds is annihilated by a weak current and η or η' is created out of gluons.  The result shows that the disconnected loops give significant contributions to the form factors, especially for Ds to η'.


(Seminarraum II)

Kategorie: Kernphysik