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Baron R.,CEA Saclay Nuclear Research Center | Boucaud P.,University Paris - Sud | Carbonell J.,CNRS Laboratory of Subatomic Physics & Cosmology | Drach V.,CNRS Laboratory of Subatomic Physics & Cosmology | And 12 more authors.
Computer Physics Communications | Year: 2011

We discuss the computation of the mass of the K and D mesons within the framework of Nf=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. © 2010 Elsevier B.V. All rights reserved.

Tolle S.,Helmholtz Institute For Strahlen Und Kernphysik Theorie | Tolle S.,University of Bonn | Hammer H.-W.,Helmholtz Institute For Strahlen Und Kernphysik Theorie | Hammer H.-W.,University of Bonn | And 2 more authors.
EPJ Web of Conferences | Year: 2010

The possibility to control short-ranged interactions of cold gases in optical traps by Feshbachresonances makes these systems ideal candidates to study universal scaling properties and Efimov physics. The spectrum of particles in a trap, idealised by a harmonic oscillator potential, in the zero range limit with 2- and 3-particle contact interactions is studied numerically. The Hamiltonian is regularised by restricting the oscillator basis and the coupling constants are tuned such that the ground state energies of the 2- and 3-particle sector are reproduced [1],[2]. Results for 2-, 3-, and 4 particle systems are presented and compared to exact results [3],[4]. © Owned by the authors, published by EDP Sciences, 2010.

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