Conveners
Chiral Symmetry: Parallel 1G
- Artan Borici (Uiversity of Tirana)
Chiral Symmetry: Parallel 5D
- Maarten Golterman (San Francisco State University)
Dr
Mario Kieburg
(University Bielefeld)
23/06/2014, 14:15
Chiral Symmetry
Talk
A finite lattice spacing may have a crucial impact on the phase diagram of QCD. The existence of the Aoki phase for Wilson fermions underlines this point. Sharpe and Wu already showed that this kind of lattice artifacts carry over to finite twisted mass. The next task is the calculation of the phase diagram at finite chemical potential. I will present the phase diagram of Wilson fermions of...
Derek Horkel
(University of Washington)
23/06/2014, 14:35
Chiral Symmetry
Talk
In this talk, I will summarize recent work with Prof. Stephen Sharpe in mapping out the phase diagram and pion spectrum for chiral perturbation theory with twisted-mass fermions in the presence of non-degeneracy between the up and down quark and discretization errors. I will show how the CP-violating phase of the continuum theory, which occurs for sufficiently large non-degeneracy, is...
Dr
Shinsuke M. Nishigaki
(Shimane University)
23/06/2014, 14:55
Chiral Symmetry
Talk
We evaluate the individual distributions of four smallest eigenvalues from chiral random matrix ensembles interpolating chGSE and chGUE by the quadrature method applied to the Fredholm Pfaffian of dynamical Bessel kernel containing a crossover parameter. These distributions are then fitted with the staggered Dirac spectra of the quenched SU(2) lattice gauge theory in the presence of...
Mr
Mikhail Denissenya
(University of Graz)
23/06/2014, 15:15
Chiral Symmetry
Talk
We study the iso-scalar and iso-vector mesons under the exclusion of the low-lying Dirac modes from valence quarks with the overlap operator within the two flavour lattice QCD. We study mesonic correlators and extract states at each level of such low-mode truncation. Our observations support a simultaneous restoration of both SU(2)_L \times SU(2)_R and U(1)_A symmetries. We finally observe...
Dr
Junichi Noaki
(KEK)
23/06/2014, 15:35
Chiral Symmetry
Talk
We report the status of 2+1-flavor simulations with the Mobius
domain-wall fermions on fine lattices of 1/a = 2.4 and 3.6 GeV.
The violation of the Ginsparg-Wilson relation is controlled at the
level of 0.5 MeV or better. Analyses of the Wilson flow observables,
heavy quark potential and light-hadron correlator are presented.
Prof.
Jacobus Verbaarschot
(Stony Brook University)
25/06/2014, 09:00
Chiral Symmetry
Talk
In a sector of fixed topological charge, the chiral condensate has a discontinuty given by the Banks-Casher formula also in the case of one-flavor QCD. However, at fixed $\theta$ angle, the chiral condensate remains constant when the quark mass crosses zero. To reconcile these contradictory observations, we have evaluated the spectral density of one-flavor QCD at $\theta=0$. For negative...
Dr
Georg Engel
(Universita' Milano-Bicocca)
25/06/2014, 09:20
Chiral Symmetry
Talk
Exploiting the Banks-Casher relation, we present a direct determination of the chiral condensate in two-flavor QCD, computing the mode number of the O(a)-improved Wilson-Dirac operator below various cutoffs. We make use of CLS-configurations with three different lattice spacings in the range of 0.05-0.08 fm and pion masses down to 190 MeV. Our data indicates a finite density of eigenmodes near...
Dr
Elena Garcia Ramos
(HU Berlin / DESY-Zeuthen)
25/06/2014, 09:40
Chiral Symmetry
Talk
We present our results for the topological susceptibility in the quenched case and attempt a non-perturbative test on the Witten-Veneziano formula. We perform a continuum limit extrapolation of the topological susceptibility computed using spectral projectors.
The physical situation of the quenched ensembles was matched to the maximally twisted mass dynamical simulations used to compute the...
Dr
Krzysztof Cichy
(DESY Zeuthen)
25/06/2014, 10:00
Chiral Symmetry
Talk
We present a comparison of different definitions of the topological charge on the lattice, with 2 and 2+1+1 flavours of dynamical twisted mass fermions. We give detailed results at one lattice spacing and also show that the correlation between different definitions increases as one approaches the continuum limit. The investigated definitions are: index of the overlap Dirac operator, spectral...
Dr
Tung-Han Hsieh
(Academia Sinica)
25/06/2014, 10:20
Chiral Symmetry
Talk
We study the chiral properties of the pseudoscalar meson in 2-flavors lattice QCD with optimal domain-wall fermion. The gauge ensembles are generated on the $ 24^3 \times 48 $ lattice with the extent in the fifth dimension $ N_s = 16 $, and the plaquette gauge action at $ \beta = 6.10 $, for three sea-quark masses corresponding to the pion masses in the range 265-465 MeV. We calculate the mass...
