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Dynamical twisted mass fermions with light quarks

AuthorsBoucaud, Ph.; Dimopoulos, P.; Farchioni, F.; Frezzotti, R.; Giménez Gómez, Vicente ; Herdoiza, Gregorio ; Jansen, K.; Lubicz, V.; Martinelli, G.; McNeile, C.; Michael, C.; Montvay, I.; Palao, David ; Papinutto, M.; Pickavance, J.; Rossi, G. C.; Scorzato, L.; Shindler, Andrea ; Simula, S.; Urbach, C.; Wenger, U.
KeywordsChiral perturbation theory
Monte Carlo algorithm
Gross-Neveu model
Yang-Mills theory
Lattice QCD
Wilson quarks
HMC algorithm
Gauge actions
European Twisted Mass (ETM) Collaboration
Issue Date13-May-2007
CitationPhysics Letters B 650(4): 304-311 (2007)
AbstractWe present results of dynamical simulations of N-f = 2 degenerate Wilson twisted mass quarks at maximal twist in the range of pseudo scalar masses 300 MeV less than or similar to m(PS) less than or similar to 550 MeV. Reaching such small masses was made possible owing to a recently developed variant of the HMC algorithm. The simulations are performed at one value of the lattice spacing a less than or similar to 0.1 fm. In order to have O(a) improvement and aiming at small residual O(a^2) cutoff effects, the theory is tuned to maximal twist by requiring the vanishing of the untwisted quark mass. Precise results for the pseudo scalar decay constant and the pseudo scalar mass are confronted with chiral perturbation theory predictions and the low energy constants F, (l)[overline](3) and (l)[overline](4) are evaluated with small statistical errors.
Description8 pages, 3 figures.-- ISI Article Identifier: 000248138100016.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-lat/0701012
Printed version published Jul 5, 2007.
Publisher version (URL)http://dx.doi.org/10.1016/j.physletb.2007.04.054
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