PaperPanorama

HEP Lattice·hep-lat

Fri·Sep 28, 2007

6 papers—5 primary·1 cross-listed·reconstructed*

All6Primary5Cross-lists1
  1. 01*

    Universal properties of the confining string in the random percolation model

    Pietro Giudice🇮🇹 · Ferdinando Gliozzi🇮🇹 · Stefano Lottini🇮🇹

    Random percolation can be fully interpreted as a confining pure gauge theory. With numerical high-precision measurements of Polyakov-Polyakov correlators at finite temperature, we could well observe the presence of shape effects due to rough fluctuations of the confining string, in complete agreement with the universality predictions up to the next-to-leading order.

    hep-latPoS(2007)·2 citations
  2. 02*

    QCD with overlap fermions: Running coupling and the 3-loop beta-function

    M. Constantinou🇨🇾 · H. Panagopoulos (Department of Physics, University of Cyprus)🇨🇾

    We calculate the relation between the bare coupling constant g_0 and the MSbar-renormalized coupling g_MS: g_0 = Z_g(g_0,a \mu) g_MS, to 2 loops in perturbation theory. We employ the standard Wilson action for gluons and the overlap action for fermions. For convenience, we have worked with the background field technique, which only requires evaluation of 2-point Green's function for the problem at hand. Our results depend explicitly on the number of fermion flavors (N_f) and colors (N). Since the dependence of Z_g on the overlap parameter rho cannot be extracted analytically, we tabulate our results for different values in the allowed range of rho (0 < rho < 2), focusing on values which are being used most frequently in simulations. Knowledge of Z_g allows us to derive the 3-loop coefficient of the bare beta-function (beta_L(g_0)) which, unlike the 1- and 2-loop coefficients, is regularization-dependent. The nontrivial dependence of Z_g and of beta_L(g_0) on rho is plotted for various choices of N, N_f.

    hep-latPRD(2007)·10 citations
  3. 03*

    The eigenvalue spectrum for dynamical Chirally Improved fermions

    Martina Joergler🇦🇹 · C. B. Lang🇦🇹

    We study the eigenvalues of Dirac operators in QCD with two mass degenerate dynamical fermions. The gauge configurations have been obtained with HMC and the so-called Chirally Improved fermionic action. We compare eigenvalues obtained for the overlap Dirac operator on these configurations with those for the Chirally Improved (CI) operator (studied earlier). Results of Random Matrix Theory allow us to determine the chiral condensate.

    hep-latPoS(2007)·5 citations
  5. 05*

    Meson spectroscopy with derivative quark sources

    Christof Gattringer🇦🇹 · Leonid Ya. Glozman🇦🇹 · C. B. Lang🇦🇹 · Daniel Mohler🇦🇹 · Sasa Prelovsek🇸🇮

    We present results for masses of light mesons obtained with the variational method using an enhanced basis of interpolating field operators with different quark smearings. The interpolators are constructed from Jacobi-smeared quarks of a Gaussian type as well as from derivative quark sources obtained by a covariant derivative acting on the Gaussian sources. For our analysis we use quenched gauge configurations with Chirally Improved quarks and the Luescher-Weisz gauge action on a 16^3 x 32 lattice with a = 0.148 fm. We discuss the influence of derivative sources on the overlap with excited states.

    hep-latPoS(2007)·6 citations
  6. 06*

    The Spatial String Tension in the Deconfined Phase of SU(N) Gauge Theory and Gauge/String Duality

    Oleg Andreev🇩🇪

    The spatial string tension of a SU(N) gauge theory without quarks is calculated using gauge/string duality for 1.2T_c<T<3T_c. The result is remarkably consistent with the available lattice data for N=2,3. Some evidence is found that to leading order the large distance physics of a string can be described by a five-dimensional geometry without a need for an internal space.

    ↳ hep-phhep-lathep-thnucl-thPLB(2008)·26 citations

* 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.