We present results for light hadrons composed of both degenerate and non-degenerate quarks in quenched lattice QCD. We calculate masses and decay constants using 60 gauge configurations with an $O(a)$--improved fermion action at $\beta = 6.2$. Using the $\rho$ mass to set the scale, we find hadron masses within two to three standard deviations of the experimental values (given in parentheses): $m_{ K^*}=868\er{ 9}{ 8}$~MeV (892~MeV), $m_{ \phi}=970\err{ 20}{ 10}$~MeV (1020~MeV), $m_N=820\err{ 90}{ 60}$~MeV (938~MeV), $m_\Delta=1300\errr{ 100}{ 100}$~MeV (1232~MeV) and $m_\Omega=1650\err{ 70}{ 50}$~MeV (1672~MeV). Direct comparison with experiment for decay constants is obscured by uncertainty in current renormalisations. However, for ratios of decay constants we obtain $f_K/f_\pi=1.20\er{ 3}{ 2}$ (1.22) and $f_\phi/f_\rho=1.13\er{ 2}{ 3}$ (1.22).
Categories: hep-lat