出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We perform fully dynamical simulations at small quark masses by reweighting in the quark mass,
calculating the weight factors stochastically. This approach avoids some of the technical difculties
associated with direct simulations. We nd that the weight factors uctuate only moderately
on nHYP smeared dynamicalWilson-clover ensembles, and demonstrate that the overlap between
the original and reweighted congurations is large both for short and long distance observables.
We could successfully reweight 164, (1.85fm)4 volume congurations from mq 20 MeV to
mq 5 MeV, and 244, (2.77fm)4 congurations from mq 8MeV to mq 3 MeV quark masses,
reaching the e -regime. Using the pseudoscalar and axialvector correlators we predict the low
energy constants S and F and study their volume and mass dependence.
