A lattice calculation of vector meson couplings to the vector and tensor currents using chirally improved fermions

TL;DR

This paper reports a lattice QCD calculation of vector meson couplings to tensor and vector currents using chirally improved fermions, showing weak quark mass dependence and agreement with previous methods.

Contribution

It introduces a quenched lattice calculation of $f_V^ot/f_V$ with chirally improved fermions, emphasizing the weak quark mass dependence of the ratio.

Findings

Results agree with QCD sum rule calculations.

Weak quark mass dependence observed.

Consistent with previous lattice studies.

Abstract

We present a quenched lattice calculation of $f_V^\perp/f_V$, the coupling of vector mesons to the tensor current normalized by the vector meson decay constant. The chirally improved lattice Dirac operator, which allows us to reach small quark masses, is used. We put emphasis on analyzing the quark mass dependence of $f_V^\perp/f_V$ and find only a rather weak dependence. Our results at the $\rho$ and $\phi$ masses agree well with QCD sum rule calculations and those from previous lattice studies.