4 search hits

Light hadrons from Nf = 2+1+1 dynamical twisted mass fermions
(2010)

Rémi Baron
Benoit Blossier
Philippe Boucaud
Jaume Carbonell
Albert Deuzeman
Vincent Drach
Federico Farchioni
Federico Farchioni
Vicent Gimenez
Gregorio Herdoiza
Karl Jansen
Chris Michael
István Montvay
Elisabetta Pallante
Olivier Pène
Siebren Reker
Carsten Urbach
Marc Wagner
Urs Wenger
 We present results of lattice QCD simulations with massdegenerate up and down and masssplit 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 three values of the lattice spacing a ~ 0:06 fm, a ~ 0:08 fm and a ~ 0:09 fm with lattice sizes ranging from L ~ 1:9 fm to L ~ 3:9 fm. We perform a preliminary study of SU(2) chiral perturbation theory by combining our lattice data from these three values of the lattice spacing.

Kaon and D meson masses with Nf = 2+1+1 twisted mass lattice QCD
(2010)

Rémi Baron
Philippe Boucaud
Jaume Carbonell
Vincent Drach
Federico Farchioni
Gregorio Herdoiza
Karl Jansen
Chris Michael
István Montvay
Elisabetta Pallante
Siebren Reker
Carsten Urbach
Marc Wagner
Urs Wenger
 We discuss the computation of the kaon and D meson masses in the Nf = 2+1+1 twisted mass lattice QCD setup, where explicit heavy flavor and parity breaking occurs at finite lattice spacing. We present three methods suitable in this context and verify their consistency.

Forces between staticlight mesons
(2010)

Marc Wagner
 The isospin, spin and parity dependent potential of a pair of staticlight mesons is computed using Wilson twisted mass lattice QCD with two flavors of degenerate dynamical quarks. From the results a simple rule can be deduced stating, which isospin, spin and parity combinations correspond to attractive and which to repulsive forces.

The spectrum of staticlight baryons in twisted mass lattice QCD
(2010)

Marc Wagner
Christian Wiese
 We compute the staticlight baryon spectrum with Nf = 2 flavors of sea quarks using Wilson twisted mass lattice QCD. As light valence quarks we consider quarks, which have the same mass as the sea quarks with corresponding pion masses in the range 340MeV<∼ mPS<∼ 525MeV, as well as partially quenched quarks, which have the mass of the physical s quark. We extract masses of states with isospin I = 0,1/2,1, with strangeness S = 0,−1,−2, with angular momentum of the light degrees of freedom j = 0,1 and with parity P = +,−. We present a preliminary extrapolation in the light u/d and an interpolation in the heavy b quark mass to the physical point and compare with available experimental results.