Light hadrons from lattice QCD with light (u,d), strange and charm dynamical quarks
hep-lat
/ Authors
Remi Baron, Philippe Boucaud, Jaume Carbonell, Albert Deuzeman, Vincent Drach, Federico Farchioni, Vicent Gimenez, Gregorio Herdoiza, Karl Jansen, Craig McNeile
and 10 more authors
Chris Michael, Istvan Montvay, David Palao, Elisabetta Pallante, Olivier Pene, Siebren Reker, Carsten Urbach, Marc Wagner, Urs Wenger, ETM Collaboration
/ Abstract
We present results of lattice QCD simulations with mass-degenerate up and down and mass-split strange and charm (N_f = 2+1+1) dynamical quarks using Wilson twisted mass fermions at maximal twist. The tuning of the strange and charm quark masses is performed at two values of the lattice spacing a~0.078 fm and a~0.086 fm with lattice sizes ranging from L~1.9 fm to L~2.8 fm. We measure with high statistical precision the light pseudoscalar mass m_PS and decay constant f_PS in a range 270 < m_PS < 510 MeV and determine the low energy parameters f_0, l_3 and l_4 of SU(2) chiral perturbation theory. We use the two values of the lattice spacing, several lattice sizes as well as different values of the light, strange and charm quark masses to explore the systematic effects. A first study of discretisation effects in light-quark observables and a comparison to N_f=2 results are performed.