Tue·Sep 10, 2002Tuesday·September 10, 2002

1. 01*

   Topological Charge Correlators, Spectral Bounds, and Contact Terms

   H. Thacker🇺🇸 · S.J. Dong🇺🇸 · T. Draper🇺🇸 · I. Horvath🇺🇸 · F.X. Lee🇺🇸 · K.-F. Liu🇺🇸 · J.B. Zhang🇦🇺

   The structure of topological charge fluctuations in the QCD vacuum is strongly restricted by the spectral negativity of the Euclidean 2-point correlator for $x\ne 0$ and the presence of a positive contact term. Some examples are considered which illustrate the physical origin of these properties.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·1 citation
2. 02*

   Heavy-light meson in anisotropic lattice QCD

   H. Matsufuru🇯🇵 · J. Harada🇯🇵 · T. Onogi🇯🇵 · A. Sugita🇯🇵

   We examine whether the $O(a)$ improved quark action on anisotropic lattices can be used as a framework for the heavy quark, which enables precision computation of matrix elements of heavy-light mesons. To this end, it is crucial to verify that a mass independent and nonperturbative tuning of the parameters is possible. As a first step, we observe the dispersion relation of heavy-light mesons on a quenched lattice using the action which is nonperturbatively tuned only for the leading terms. On a lattice with the spatial cutoff $a_{\sigma }^{-1}\simeq$ 1.6 GeV and the anisotropy $\xi =4$, the relativity relation holds within 2% accuracy in the quark mass region $a_{\sigma }{m}_Q\le 1.2$ with the bare anisotropy parameter tuned for the massless quark. We also apply the action to a calculation of heavy-light decay constants in the charm quark mass region.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·3 citations
3. 03*

   Chiral extrapolation of light-light and heavy-light decay constants in unquenched QCD

   JLQCD collaboration: S. Hashimoto🇯🇵 · S. Aoki🇯🇵 · M. Fukugita🇯🇵 · K-I. Ishikawa🇯🇵 · N. Ishizuka🇯🇵 · Y. Iwasaki🇯🇵 · K. Kanaya🇯🇵 · T. Kaneko🇯🇵 · Y. Kuramashi🇯🇵 · M. Okawa🇯🇵 · N. Tsutsui🇯🇵 · A. Ukawa🇯🇵 · N. Yamada🇯🇵 · T. Yoshie🇯🇵

   We test the one-loop chiral perturbation theory formula on unquenched lattice data of pseudoscalar meson decay constants. The chiral extrapolation including the effect of the chiral logarithm is attempted and its uncertainty is discussed.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·27 citations
4. 04*

   A lattice estimate of the g_{D^* D pi} coupling

   A. Abada🇫🇷 · D. Becirevic🇮🇹 · Ph. Boucaud🇫🇷 · G. Herdoiza🇫🇷 · J.P. Leroy🇫🇷 · A. Le Yaouanc🇫🇷 · O. Pene🇫🇷 · J. Rodriguez-Quintero🇪🇸

   We present the results of the first direct determination of the g_{D^* D pi} coupling using lattice QCD. From our simulations in the quenched approximation, we obtain g_{D^* D pi} = 18.8 +/- 2.3^{+1.1}_{-2.0} and hat(g) = 0.67 +/- 0.08^{+0.04}_{-0.06}. It is in agreement with a recent experimental result from CLEO.

   hep-lathep-phNucl.Phys.B Proc.Suppl.(2003)·18 citations
5. 05*

   Confinement without a center: the exceptional group G(2)

   K. Holland🇺🇸 · P. Minkowski🇨🇭 · M. Pepe🇨🇭 · U.-J. Wiese🇨🇭

   We discuss theories with the exceptional centerless gauge group G(2), paying attention to confinement and the pattern of chiral symmetry breaking. Exploiting the Higgs mechanism to break the symmetry down to SU(3), we also present how the familiar features of confinement and chiral symmetry breaking of SU(3) gauge theories reemerge. G(2) gauge theories show up as an unusual theoretical framework to study SU(3) gauge theories without the ``luxury'' of a center.

   hep-lathep-thNucl.Phys.B Proc.Suppl.(2003)·7 citations
6. 06*

   String breaking with Wilson loops?

   Slavo Kratochvila (ETH Zurich)🇨🇭 · Philippe de Forcrand (ETH Zurich and CERN)🇨🇭

   A convincing, uncontroversial observation of string breaking, when the static potential is extracted from Wilson loops only, is still missing. This failure can be understood if the overlap of the Wilson loop with the broken string is exponentially small. In that case, the broken string ground state will only be seen if the Wilson loop is long enough. Our preliminary results show string breaking in the context of the 3d SU(2) adjoint static potential, using the Lüscher-Weisz exponential variance reduction approach. As a by-product, we measure the fundamental SU(2) static potential with improved accuracy and see clear deviations from Casimir scaling.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·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.