Neutral mesons and disconnected diagrams in Twisted Mass QCD

Understand

We evaluate properties of neutral mesons in Nf=2 dynamical simulations of TMQCD at maximal twist.

• The pion is explored - establishing the size of the isospin splitting (an order a^2 effect).
• We investigate the eta' (the Nf=2 flavour singlet pseudoscalar meson) and neutral rho and scalar mesons.
• We show that disconnected diagrams can be evaluated very efficiently in TMQCD using variance reduction methods.