Lattice2010

Session

Parallel 11: Chiral symmetry

14 Jun 2010, 14:30

Villasimius, Sardinia

122. The Aoki phase revisited

Alejandro Vaquero (Universidad de Zaragoza)

14/06/2010, 14:30

Chiral symmetry

Continuing with the work exposed in the last lattice conference [Phys.Rev.D79:014509,2009, PoS(LAT2009)068], and in order to distinguish between the two different scenarios proposed by us and Sharpe [Phys.Rev.D79:054503,2009], we present data of simulations of QCD with two flavours of dynamical Wilson fermions, inside the Aoki phase and without an external source...

133. Wilson Fermions, Random Matrix Theory and the Aoki Phase

Jacobus Verbaarschot (Stony Brook University)

14/06/2010, 14:50

Chiral symmetry

The QCD partition function for the Wilson Dirac operator, $D_W$, at finite lattice spacing $a$ can be expressed in terms of a chiral Lagrangian as a systematic expansion in the mass, the momentum and $a^2$. Starting from this chiral Lagrangian we obtain an analytical expression  for the spectral density of $\gamma_5 D_W$ in the microscopic domain (also known as the $]epsilon$-domain). It is...

49. Spectra of the Wilson Dirac operator for QCD with dynamical quarks

P.H. Damgaard (The Niels Bohr Institute)

14/06/2010, 15:10

Chiral symmetry

The spectrum of the Wilson Dirac operator for $N_f=1$ in the microscopic ($\epsilon$) regime including order $a^2$ corrections is discussed. Exact results are obtained from Wilson chiral Perturbation Theory in sectors of fixed topology. Topology is defined as the number of real eigenvalues of the Wilson Dirac operator. We compute the density of these real modes as well as the...

218. Mixed action computations on fine dynamical lattices

Fabio Bernardoni (Universidad de Valencia)

14/06/2010, 15:30

Chiral symmetry

We report on our simulations with Neuberger valence fermions on CLS Nf=2 configurations with non perturbatively O(a) improved Wilson sea quarks. We consider the matching of QCD to ChPT in the so called mixed regime in which the sea quarks are in the p-regime while the valence quarks are in the p or in the epsilon regime.

90. Overlap Valence Quarks on a Twisted Mass Sea

Krzysztof Cichy (Adam Mickiewicz University, Faculty of Physics)

14/06/2010, 15:50

Chiral symmetry

We present the results of an investigation of a mixed action approach of overlap valence and maximally twisted mass sea quarks. Employing a matching condition on the pion mass, we analyze the continuum limit scaling of the pion decay constant and the role of chiral zero modes of the overlap operator in this process. We employ gauge field configurations generated by the European Twisted Mass...