Tue·Oct 18, 2005Tuesday·October 18, 2005

1. 01*

   Diquark properties from lattice QCD

   Konstantinos Orginos (College of William and Mary / JLab)🇺🇸

   It has been argued recently that diquarks, a pair of quarks in the anti-triplet representation of SU(3) color, are important building blocks of baryons. The assumption that the scalar diquark is tightly bound seems to be nicely accommodated by experimental data. In this paper I attempt to extract phenomenological properties of diquarks from lattice QCD calculations. In particular, I use the MILC 2+1 dynamical fermion lattices with domain wall fermion valence quarks to probe diquarks very close to the chiral limit.

   hep-latPoS(2006)·41 citations
2. 02*

   The pseudoparticle approach for solving path integrals in gauge theories

   Marc Wagner🇩🇪 · Frieder Lenz🇩🇪

   We present a numerical technique for calculating path integrals in non-compact U(1) and SU(2) gauge theories. The gauge fields are represented by a superposition of pseudoparticles of various types with their amplitudes and color orientations as degrees of freedom. Applied to Maxwell theory this technique results in a potential which is in excellent agreement with the Coulomb potential. For SU(2) Yang-Mills theory the same technique yields clear evidence of confinement. Varying the coupling constant exhibits the same scaling behavior for the string tension, the topological susceptibility and the critical temperature while their dimensionless ratios are similar to those obtained in lattice calculations.

   hep-latPoS(2006)·8 citations
3. 03*

   The equation of state in lattice QCD: with physical quark masses towards the continuum limit

   Y. Aoki (1)🇩🇪 · Z. Fodor (1 & 2)🇩🇪 · S.D. Katz (2)🇭🇺 · K.K. Szabo (1) ((1) Wuppertal U., (2) Eotvos U.)🇩🇪

   The equation of state of QCD at vanishing chemical potential as a function of temperature is determined for two sets of lattice spacings. Coarser lattices with temporal extension of N_t=4 and finer lattices of N_t=6 are used. Symanzik improved gauge and stout-link improved staggered fermionic actions are applied. The results are given for physical quark masses both for the light quarks and for the strange quark. Pressure, energy density, entropy density, quark number susceptibilities and the speed of sound are presented.

   hep-lathep-phJHEP(2006)·358 citations
4. 04*

   Critical behavior in a non-local interface model

   Matteo Beccaria🇮🇹 · Massimo Campostrini🇮🇹 · Alessandra Feo🇮🇹

   The Raise and Peel model is a recently proposed one-dimensional statistical model describing a fluctuating interface. The evolution of the model follows from the competition between adsorption and desorption processes. The model is non-local due to the possible occurrence of avalanches. At a special ratio of the adsorption-desorption rates the model is integrable and many rigorous results are known. Off the critical point, the phase diagram and scaling properties are not known. In this paper, we search for indications of phase transition studying the gap in the spectrum of the non-hermitian generator of the stochastic interface evolution. We present results for the gap obtained from exact diagonalization and from Monte Carlo estimates derived from temporal correlations of various observables.

   ↳ cond-mat.stat-mechhep-latJ.Phys.A(2006)·0 citations
5. 05*

   The triton and three-nucleon force in nuclear lattice simulations

   B. Borasoy🇩🇪 · H. Krebs🇩🇪 · D. Lee🇺🇸 · U.-G. Meißner🇩🇪

   We study the triton and three-nucleon force at lowest chiral order in pionless effective field theory both in the Hamiltonian and Euclidean nuclear lattice formalism. In the case of the Euclidean lattice formalism, we derive the exact few-body worldline amplitudes corresponding to the standard many-body lattice action. This will be useful for setting low-energy coefficients in future nuclear lattice simulations. We work in the Wigner SU(4)-symmetric limit where the S-wave scattering lengths {1}S{0} and {3}S{1} are equal. By comparing with continuum results, we demonstrate for the first time that the nuclear lattice formalism can be used to study few-body nucleon systems.

   ↳ nucl-thhep-lathep-phNPA(2006)·51 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.