Large cutoff effects of dynamical Wilson fermions ∗
نویسندگان
چکیده
We present and discuss results for cutoff effects in the PCAC masses and the mass dependence of r0 for full QCD and various fermion actions. Our discussion of how one computes mass dependences – here of r0 – is also relevant for comparisons with chiral perturbation theory.
منابع مشابه
Impact of large cutoff-effects on algorithms for improved Wilson fermions
As a feasibility study for a scaling test we investigate the behavior of algorithms for dynamical fermions in the Nf =2 Schrödinger functional at an intermediate volume of 1 fm. Simulations were performed using HMC with two pseudo–fermions and PHMC at lattice spacings of approximately 0.1 and 0.07 fm. We show that some algorithmic problems are due to large cutoff–effects in the spectrum of the ...
متن کاملO(a2) cutoff effects in Wilson fermion simulations
We show that the size of the O(a2) flavour violating cutoff artifacts that have been found to affect the value of the neutral pion mass in simulations with maximally twisted Wilson fermions is controlled by a continuum QCD quantity that is fairly large and is determined by the dynamical mechanism of spontaneous chiral symmetry breaking. One can argue that the neutral pion mass is the only physi...
متن کاملCutoff–effects in the spectrum of dynamical Wilson fermions
We investigate the low–lying eigenvalues of the improved Wilson–Dirac operator in the Schrödinger functional with two dynamical quark flavors. At a lattice spacing of approximately 0.1 fm we find more very small eigenvalues than in the quenched case. These cause problems with HMC–type algorithms and in the evaluation of fermionic correlation functions. Through a simulation at a finer lattice sp...
متن کاملThermodynamics with Dynamical Clover Fermions
We investigate the finite temperature behavior of nonperturbatively improved clover fermions on lattices with temporal extent Nt = 4 and 6. Unfortunately in the gauge coupling range, where the clover coefficient has been determined nonperturbatively, the finite temperature crossover/transition occurs at heavy pseudoscalar masses and large pseudoscalar to vector meson mass ratios. However, on an...
متن کاملGap Domain Wall Fermions
I demonstrate that the chiral properties of Domain Wall Fermions (DWF) in the large to intermediate lattice spacing regime of QCD, 1 to 2 GeV, are significantly improved by adding to the action two standard Wilson fermions with supercritical mass equal to the negative DWF five dimensional mass. Using quenched DWF simulations I show that the eigenvalue spectrum of the transfer matrix Hamiltonian...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003