# The QCD axion, precisely

The QCD axion is probably the most robust solution to the strong CP

problem and a natural dark matter candidate. While its properties, such as the

mass and the couplings, are mostly determined by non-perturbative QCD effects

I will present recent computations demonstrating that they can be reliably

extracted with percent accuracy, which is important for the theory

interpretation of experimental results. I will also discuss some recent

lattice QCD results highlighting a departure from the usual instanton