Light Meson Physics from Maximally Twisted Mass Lattice QCD

R. Baron (1) , Ph. Boucaud (1) , P. Dimopoulos (2) , F. Farchioni (3) , R. Frezzotti (2) , V. Gimenez (4) , G. Herdoiza (5) , K. Jansen (5) , V. Lubicz (6) , C. Michael (7) , G. Muenster (3) , D. Palao (4) , G. C. Rossi (2) , L. Scorzato (8) , A. Shindler (9) , S. Simula (6) , T. Sudmann (3) , C. Urbach (10) , U. Wenger (11)

1 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
2 Dipartimento di Fisica [Roma Tor Vergata]
3 Institut fuer Theoretische Physik, Universitaet Muenster
4 Dep de Fisica Teorica & IFIC, Universitat de Valencia
5 DESY - Deutsches Elektronen-Synchrotron [Zeuthen]
6 INFN - Istituto Nazionale di Fisica Nucleare [Sezione di Roma 1]
7 Theoretical Physics Division, Dept of Mathematical Sciences, University of Liverpool
8 ECT
9 IFT - Instituto de Física Teórica UAM/CSIC
10 HISKP - Helmholtz-Institut für Strahlen- und Kernphysik
11 Institute for Theoretical Physics

We present a comprehensive investigation of light meson physics using maximally twisted mass fermions for two mass-degenerate quark flavours. By employing four values of the lattice spacing, spatial lattice extents ranging from 2.0 fm to 2.5 fm and pseudo scalar masses in the range 280 MeV to 650 MeV we control the major systematic effects of our calculation. This enables us to confront our data with chiral perturbation theory and extract low energy constants of the effective chiral Lagrangian and derived quantities, such as the light quark mass, with high precision.

Domaines: Physique des Hautes Energies - Réseau [hep-lat]

R. Baron, Ph. Boucaud, P. Dimopoulos, F. Farchioni, R. Frezzotti, et al.. Light Meson Physics from Maximally Twisted Mass Lattice QCD. Journal of High Energy Physics, 2010, 1008, pp.097. ⟨10.1007/JHEP08(2010)097⟩. ⟨hal-00439236⟩