HEP Lattice·hep-lat
8 papers—7 primary·1 cross-listed·reconstructed*
Lattice QCD is progressing toward being able to impact our understanding of nuclei and nuclear processes. I discuss areas of nuclear physics that are becoming possible to explore with lattice QCD, the techniques that are currently available and the status of numerical explorations.
S. Aoki🇯🇵 · O. Baer · T. Ishikawa🇯🇵 · S. Takeda🇯🇵
We consider 2+1 flavor Wilson Chiral Perturbation Theory including the lattice spacing contributions of O(). We adopt a power counting appropriate for the unquenched lattice simulations carried out by the CP-PACS/JLQCD collaboration and compute the pseudo scalar meson masses to one loop. These expression are required to perform the chiral extrapolation of the CP-PACS/JLQCD lattice data.
J. B. Zhang🇦🇺 · D. B. Leinweber🇦🇺 · A. G. Williams🇦🇺
We compute non-perturbatively the renormalization constants of composite operators for overlap fermions by using the regularization independent scheme. The scaling behavior of the renormalization constants is investigated using the data from three lattices with similar physical volumes and different lattice spacings. The approach of the renormalization constants to the continuum limit is explored.
Tommy Burch🇩🇪 · Christof Gattringer🇦🇹 · Leonid Ya. Glozman🇦🇹 · Christian Hagen🇩🇪 · Dieter Hierl🇩🇪 · C. B. Lang🇦🇹 · Andreas Schaefer
We study baryons on the lattice with a special focus on excited states. For that purpose we construct several interpolators which differ in their Dirac structure. These interpolators are built from Jacobi smeared quarks with different widths in order to allow for operators with improved spatial wavefunctions. We compute all cross correlations and use the variational method to determine which combinations of operators have best overlap with ground and excited states. Our approach yields promising results for the spin-1/2 baryons: nucleon, sigma, xi and lambda. For the spin-3/2 baryons, delta and omega, we obtain results which are consistent with results of other groups.
Stefan Solbrig (1)🇩🇪 · Jochen Gattnar (2)🇩🇪 · Christof Gattringer (3)🇦🇹 · Kurt Langfeld (2)🇩🇪 · Hugo Reinhardt (2)🇩🇪 · Andreas Schäfer (1)🇩🇪 · Torsten Tok (2) ((1)University of Regensburg, (2) University of Tübingen, (3) University of Graz)🇩🇪
Gluon field configurations with non-trivial topology like instantons, magnetic monopoles and center vortices play a crucial role in QCD and, in particular, for the spontaneous breaking of chiral symmetry. Moreover, center vortices are strongly correlated with confinement. We present evidence, that there is a deep connection between the topology of gauge fields and center vortices. We use the chirally improved lattice Dirac operator to compute eigenvectors and eigenvalues of various lattice gauge field configurations. Removing vortices from thermalized configurations also removes the topological content of the gauge field. As a consistency check, we apply random changes to the raw configurations.
C. Bernard🇺🇸 · T. Burch🇩🇪 · C. DeTar🇺🇸 · Steven Gottlieb🇺🇸 · U. M. Heller🇺🇸 · J. E. Hetrick🇺🇸 · L. Levkova🇺🇸 · F. Maresca🇺🇸 · D. B. Renner🇺🇸 · R. Sugar🇺🇸 · D. Toussaint🇺🇸
We report results for the interaction measure, pressure and energy density for nonzero temperature QCD with 2+1 flavors of improved staggered quarks. In our simulations we use a Symanzik improved gauge action and the Asqtad improved staggered quark action for lattices with temporal extent and 6. The heavy quark mass is fixed at approximately the physical strange quark mass and the two degenerate light quarks have masses or . The calculation of the thermodynamic observables employs the integral method where energy density and pressure are obtained by integration over the interaction measure.
Jeff Greensite🇺🇸 · Stefan Olejnik🇸🇰 · Daniel Zwanziger🇺🇸
The infinite color-Coulomb energy of color-charged states is related to enhanced density of near-zero modes of the Faddeev-Popov operator in Coulomb gauge. We confirm the enhancement in numerical simulations and show that it is tied to the presence of percolating center vortex configurations.
Thomas A. Ryttov🇩🇰 · Francesco Sannino (NBI)🇩🇰
The 't Hooft and Corrigan-Ramond limits of massless one-flavor QCD consider the two Weyl fermions to be respectively in the fundamental representation or the two index antisymmetric representation of the gauge group. We introduce a limit in which one of the two Weyl fermions is in the fundamental representation and the other in the two index antisymmetric representation of a generic SU(N) gauge group. This theory is chiral and to avoid gauge anomalies a more complicated chiral theory is needed. This is the generalized Georgi-Glashow model with one vector like fermion. We show that there is an interesting phase in which the considered chiral gauge theory, for any N, Higgses via a bilinear condensate: The gauge interactions break spontaneously to ordinary massless one-flavor SU(3) QCD. The additional elementary fermionic matter is uncharged under this SU(3) gauge theory. It is also seen that when the number of colors reduce to three it is exactly this hidden QCD which is revealed.
* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.