Thu·Sep 23, 2004Thursday·September 23, 2004

1. 01*

   Polyakov Loops, Z(N) Symmetry, and Sine-Law Scaling

   Peter N. Meisinger🇺🇸 · Michael C. Ogilvie🇺🇸

   We construct an effective action for Polyakov loops using the eigenvalues of the Polyakov loops as the fundamental variables. We assume Z(N) symmetry in the confined phase, a finite difference in energy densities between the confined and deconfined phases as $T\to 0$, and a smooth connection to perturbation theory for large $T$. The low-temperature phase consists of $N-1$ independent fields fluctuating around an explicitly Z(N) symmetric background. In the low-temperature phase, the effective action yields non-zero string tensions for all representations with non-trivial $N$-ality. Mixing occurs naturally between representations of the same $N$-ality. Sine-law scaling emerges as a special case, associated with nearest-neighbor interactions between Polyakov loop eigenvalues.

   hep-latNucl.Phys.B Proc.Suppl.(2005)·6 citations
2. 02*

   String breaking with dynamical Wilson fermions

   G.S. Bali🇬🇧 · Th. Duessel🇩🇪 · Th. Lippert🇩🇪 · H. Neff🇺🇸 · Z. Prkacin🇩🇪 · K. Schilling🇩🇪

   We present results of our ongoing determination of string breaking in full QCD with N_f=2 Wilson fermions. Our investigation of the fission of the static quark-antiquark string into a static-light meson-antimeson system is based on dynamical configurations of size 24^3 x 40 produced by the TxL collaboration. Combining various optimization methods we determine the matrix elements of the two-by-two system with so far unprecedented accuracy. The all-to-all light quark propagators occurring in the transition element are computed from eigenmodes of the Hermitian Wilson-Dirac matrix complemented by stochastic estimates in the orthogonal subspace. We observe a clear signature for level-splitting between ground state and excited potential. Thus, for the first time, string breaking induced by sea quarks is observed in a simulation of 4-dimensional lattice-QCD.

   hep-latNucl.Phys.B Proc.Suppl.(2005)·18 citations
3. 03*

   Twisted mass Lattice QCD

   Roberto Frezzotti (INFN Milano and Univ. of Milano Bicocca, Milano, Italy)🇮🇹

   I review the main theoretical properties and some recent analytical and numerical investigations of the formulations of lattice QCD with chirally twisted Wilson quarks (also known as twisted mass lattice QCD).

   hep-latNucl.Phys.B Proc.Suppl.(2005)·33 citations
4. 04*

   RG solutions for \alpha_s at large N_c in d=3+1 QCD

   Yu.A.Simonov🇷🇺

   Solutions of RG equations for $\beta (\alpha )$ and $\alpha (Q)$ are found in the class of meromorphic functions satisfying asymptotic conditions at large $Q$ (resp. small $\alpha )$, and analyticity properties in the $Q^2$ plane. The resulting ${\alpha }_R(Q)$ is finite in the Euclidean $Q^2$ region and agrees well at $Q\ge 1$ GeV with the $\overline{MS}{\alpha }_s(Q)$.

   ↳ hep-phhep-lathep-thJ.Nonlin.Math.Phys.(2005)·6 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.