Light hadrons from lattice QCD with light (u,d), strange and charm dynamical quarks
arXiv:1004.5284 · doi:10.1007/JHEP06(2010)111
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.
31 pages, 14 figures
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- The chirally rotated Schrödinger functional with Wilson fermions and automatic O(a) improvement
- On the pion decay constant
- Chiral dynamics with strange quarks in the light of recent lattice simulations
- Chiral logs in twisted mass lattice QCD with large isospin breaking
- Pseudoscalar decay constants from N_f=2+1+1 twisted mass lattice QCD
- Continuum Limit of Overlap Valence Quarks on a Twisted Mass Sea
- Twisted mass chiral perturbation theory for 2+1+1 quark flavours
- Towards Four-Flavour Dynamical Simulations
- Quark masses with Nf=2 twisted mass lattice QCD