Pseudoscalar decay constants $f_K/f_Ï$, $f_D$ and $f_{D_s}$ with $N_f = 2 + 1 + 1$ ETMC configurations

P. Dimopoulos; R. Frezzotti; P. Lami; V. Lubicz; E. Picca; L. Riggio; G. C. Rossi; F. Sanfilippo; S. Simula; C. Tarantino

paper

Pseudoscalar decay constants $f_{K} / f_{I ¨} $ , $f_{D}$ and $f_{D_{s}}$ with $N_{f} = 2 + 1 + 1$ ETMC configurations

arXiv:1311.3080

Abstract

We present a lattice QCD calculation of the pseudoscalar decay constants $f_{K}$ , $f_{D}$ and $f_{D_{s}}$ performed by the European Twisted Mass Collaboration with $N_{f} = 2 + 1 + 1$ dynamical fermions. We simulated at three different values of the lattice spacing, the smallest being approximately $0.06 f m$ , and with pion masses as small as $210$ MeV. Our main results are: $f_{K^{+}} / f_{I ¨ ^{+}} = 1.183 (17)$ , $f_{K^{+}} = 154.4 (2.1)$ MeV, $f_{D_{s}} = 242.1 (8.3)$ MeV, $f_{D} = 201.9 (8.0)$ MeV, $f_{D_{s}} / f_{D} = 1.199 (25)$ and $(f_{D_{s}} / f_{D}) / (f_{K} / f_{I ¨} ) = 1.005 (15)$ .

7 pages, 5 figures, presented at the 31st International Symposium on Lattice Field Theory (Lattice 2013), 29 July - 3 August 2013, Mainz, Germany

Pseudoscalar decay constants fK​/fI¨​, fD​ and fDs​​ with Nf​=2+1+1 ETMC configurations

Abstract

Pseudoscalar decay constants $f_{K} / f_{I ¨} $ , $f_{D}$ and $f_{D_{s}}$ with $N_{f} = 2 + 1 + 1$ ETMC configurations