K* vector and tensor couplings from Nf = 2 tmQCD
Abstract
The mass mK* and vector coupling fK* of the K*-meson, as well as the ratio of the tensor to vector couplings fT/fV|K*, are computed in lattice QCD. Our simulations are performed in a partially quenched setup, with two dynamical (sea) Wilson quark flavours, having a maximally twisted mass term. Valence quarks are either of the standard or the Osterwalder-Seiler maximally twisted variety. Results obtained at three values of the lattice spacing are extrapolated to the continuum, giving mK* = 981(33) MeV, fK* = 240(18) MeV and fT(2 GeV)/fV|K* = 0.704(41).
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