Konstantin Ottnad

Publications (2)0 Total impact

• Article: Properties of pseudoscalar flavour-singlet mesons from 2+1+1 twisted mass lattice QCD

  Krzysztof Cichy, Vincent Drach, Elena Garcia Ramos, Karl Jansen, Chris Michael, Konstantin Ottnad, Carsten Urbach, Falk Zimmermann
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  ABSTRACT: We study properties of pseudoscalar flavour-singlet mesons from Wilson twisted mass lattice QCD with Nf=2+1+1 dynamical quark flavors. Results for masses are presented at three values of the lattice spacing and light quark masses corresponding to values of the pion mass from 230 MeV to 500 MeV. We briefly discuss scaling effects and the light and strange quark mass dependence of the eta mass. In addition we present an exploratory study using Osterwalder-Seiler type strange and charm valence quarks. This approach avoids some of the complications of the twisted mass heavy doublet. We present first results for matching valence and unitary actions and a comparison of statistical uncertainties.
  11/2012;
• Source

  Available from: ArXiv

  Article: Eta and eta' meson masses from Nf=2+1+1 twisted mass lattice QCD

  Konstantin Ottnad, Carsten Urbach, Chris Michael, Siebren Reker
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  ABSTRACT: We determine mass and flavour content of eta and eta' states using Nf=2+1+1 Wilson twisted mass lattice QCD. We describe how those flavour singlet states need to be treated in this lattice formulation. Results are presented for two values of the lattice spacing, a~0.08 fm and a~0.09 fm, with a range of light quark masses corresponding to values of the pion mass from 270 to 500 MeV and fixed bare strange and charm quark mass values.
  11/2011;