One-flavour QCD at finite temperature

We present results, for heavy to moderate quark masses, of a study of thermodynamic properties of l-flavour QCD, using the multiboson algorithm. Finite-size scaling behaviour is studied on lattices of size 8(3) x 4, 12(3) x 4 and 16(3) x 4. It is shown that, for heavy quarks, the peak of the Polyakov loop susceptibility grows linearly with the spatial volume, indicating a first order phase transition. The deconfinement ratio and the distribution of the norm of the Polyakov loop corroborate this result. For moderately heavy quarks the first-order transition weakens and becomes a crossover. We estimate the end point of the first-order phase transition to occur at a quark mass of about 1.6 GeV.