F. Farchioni
University of Münster
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Journal of High Energy Physics | 2010
Remi Baron; Ph. Boucaud; Jaume Carbonell; Albert Deuzeman; Vincent Drach; F. Farchioni; V. Gimenez; G. Herdoiza; Karl Jansen; C. McNeile; C. Michael; I. Montvay; D. Palao; Elisabetta Pallante; O. Pène; Carsten Urbach; Marc Wagner; Urs Wenger; Siebren Reker
We present results of lattice QCD simulations with mass-degenerate up and down and mass-split strange and charm (Nf = 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 mPS and decay constant fPS in a range 270 ≲ mPS ≲ 510 MeV and determine the low energy parameters f0 and
Computer Physics Communications | 2008
Philippe Boucaud; P. Dimopoulos; F. Farchioni; R. Frezzotti; Vicent Gimenez; Gregorio Herdoiza; Karl Jansen; Vittorio Lubicz; C. Michael; Gernot Münster; D. Palao; Giancarlo Rossi; L. Scorzato; A. Shindler; S. Simula; Tobias Sudmann; C. Urbach; Urs Wenger
{\bar{l}_{3,4}}
Journal of High Energy Physics | 2010
Remi Baron; Phillip Boucaud; P. Dimopoulos; Roberto Frezzotti; D. Palao; Giancarlo Rossi; F. Farchioni; Gernot Münster; Tobias Sudmann; Vicent Gimenez; Gregorio Herdoiza; Karl Jansen; Vittorio Lubicz; S. Simula; C. Michael; L. Scorzato; A. Shindler; Carsten Urbach; Urs Wenger
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 Nf = 2 results are performed.
Physics Letters B | 2007
Ph. Boucaud; P. Dimopoulos; F. Farchioni; Roberto Frezzotti; V. Gimenez; G. Herdoiza; Karl Jansen; Vittorio Lubicz; G. Martinelli; Craig McNeile; C. Michael; I. Montvay; D. Palao; Mauro Papinutto; J. Pickavance; G. C. Rossi; L. Scorzato; A. Shindler; S. Simula; C. Urbach; Urs Wenger
In a recent paper [ETMC, P. Boucaud et al., Phys. Lett. B 650 (2007) 304, hep-lat/0701012] we presented precise lattice QCD results of our European Twisted Mass Collaboration (ETMC). They were obtained by employing two mass-degenerate flavours of twisted mass fermions at maximal twist. In the present paper we give details on our simulations and the computation of physical observables. In particular, we discuss the problem of tuning to maximal twist, the techniques we have used to compute correlators and error estimates. In addition, we provide more information on the algorithm used, the autocorrelation times and scale determination, the evaluation of disconnected contributions and the description of our data by means of chiral perturbation theory formulae.
Computer Physics Communications | 2011
Remi Baron; Philippe Boucaud; Jaume Carbonell; Vincent Drach; F. Farchioni; Gregorio Herdoiza; Karl Jansen; C. Michael; I. Montvay; Elisabetta Pallante; O. Pène; Siebren Reker; Carsten Urbach; Marc Wagner; Urs Wenger
We present a comprehensive investigation of light meson physics using maximally twisted mass fermions for Nf = 2 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 ≲ mPS ≲ 650MeV we control the major systematic effects of our calculation. This enables us to confront our Nf = 2 data with SU(2) chiral perturbation theory and extract low energy constants of the effective chiral Lagrangian and derived quantities, such as the light quark mass.
Journal of High Energy Physics | 2008
B. Blossier; Ph. Boucaud; P. Dimopoulos; F. Farchioni; Roberto Frezzotti; V. Gimenez; G. Herdoiza; K. Jansen; Vittorio Lubicz; C. Michael; D. Palao; Mauro Papinutto; A. Shindler; S. Simula; Cecilia Tarantino; C. Urbach; Urs Wenger
We present results of dynamical simulations with 2 flavours of degenerate Wilson twisted mass quarks at maximal twist in the range of pseudo scalar masses from 300 to 550 MeV. The simulations are performed at one value of the lattice spacing a \lesssim 0.1 fm. In order to have O(a) improvement and aiming at small residual 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, \bar{l}_3 and \bar{l}_4 are evaluated with small statistical errors.
Physical Review D | 2008
C. Alexandrou; Remi Baron; B. Blossier; M. Brinet; Jaume Carbonell; P. Dimopoulos; Vincent Drach; F. Farchioni; R. Frezzotti; P. Guichon; G. Herdoiza; Karl Jansen; T. Korzec; Giannis Koutsou; Zhaofeng Liu; C. Michael; O. Pène; A. Shindler; C. Urbach; Urs Wenger
We discuss the computation of the mass of the K and D mesons within the framework of N-f = 2 + 1 + 1 twisted mass lattice QCD from a technical point of view. These quantities are essential, already at the level of generating gauge configurations, being obvious candidates to tune the strange and charm quark masses to their physical values. In particular, we address the problems related to the twisted mass flavor and parity symmetry breaking, which arise when considering a non-degenerate (c, s) doublet. We propose and verify the consistency of three methods to extract the K and D meson masses in this framework. (c) 2010 Elsevier By. All rights reserved.
arXiv: High Energy Physics - Lattice | 2011
Remi Baron; B. Blossier; Ph. Boucaud; Jaume Carbonell; Albert Deuzeman; Vincent Drach; F. Farchioni; V. Gimenez; G. Herdoiza; Karl Jansen; C. Michael; I. Montvay; Elisabetta Pallante; O. Pène; S. Reker; C. Urbach; M. Wagner; Urs Wenger
We present the results of a lattice QCD calculation of the average up-down and strange quark masses and of the light meson pseudoscalar decay constants with Nf = 2 dynamical fermions. The simulation is carried out at a single value of the lattice spacing with the twisted mass fermionic action at maximal twist, which guarantees automatic (a)-improvement of the physical quantities. Quark masses are renormalized by implementing the non perturbative RI-MOM renormalization procedure. Our results for the light quark masses are mud(2 GeV) = 3.85±0.12±0.40 MeV, ms(2 GeV) = 105±3±9 MeV and ms/mud = 27.3±0.3±1.2. We also obtain fK = 161.7±1.2±3.1 MeV and the ratio fK/fπ = 1.227±0.009±0.024. From this ratio, by using the experimental determination of Γ(K → μμ(γ))/Γ(π → μμ(γ)) and the average value of |Vud| from nuclear beta decays, we obtain |Vus| = 0.2192(5)(45), in agreement with the determination from Kl3 decays and the unitarity constraint.
European Physical Journal C | 2005
F. Farchioni; K. Jansen; I. Montvay; Enno E. Scholz; L. Scorzato; A. Shindler; Naoya Ukita; C. Urbach; I. Wetzorke
We present results on the mass of the nucleon and the
European Physical Journal C | 2002
F. Farchioni; C. Gebert; Robert Kirchner; I. Montvay; A. Feo; Gernot Münster; Tobias Galla; Anastassios Vladikas
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