HEP Lattice·hep-lat
8 papers—8 primary·0 cross-listed·reconstructed*
O. Baer · G. Rupak🇺🇸 · N. Shoresh🇺🇸
The O(a^2) contributions to the chiral effective Lagrangian for lattice QCD with Wilson fermions are constructed. The results are generalized to partially quenched QCD with Wilson fermions as well as to the "mixed'' lattice theory with Wilson sea quarks and Ginsparg-Wilson valence quarks.
F.V.Gubarev🇷🇺 · A.V.Kovalenko🇷🇺 · M.I.Polikarpov🇷🇺 · S.N.Syritsyn🇷🇺 · V.I.Zakharov🇩🇪
We observe that on the currently available lattices the non-Abelian action associated with the P-vortices is ultraviolet divergent. On the other hand, the total area of the vortices scales in physical units. Since both the ultraviolet and infrared scales are manifested and there is no parameter to tune, the observed phenomenon can be called self tuning.
J.M. Carmona🇪🇸 · M. D'Elia🇮🇹 · L. Del Debbio🇮🇹 · A. Di Giacomo🇮🇹 · B. Lucini🇬🇧 · G. Paffuti🇮🇹 · C. Pica🇮🇹
The order and the nature of the finite-temperature phase transition of QCD with two flavors of dynamical quarks is investigated. An analysis of the critical exponent of the specific heat is performed through finite-size and finite-mass scaling of various susceptibilities. Dual superconductivity of QCD vacuum is investigated using a disorder parameter, namely the v.e.v. of a monopole creation operator. Hybrid R simulations were run at lattice spatial sizes of , , and and temporal size , with quark masses in the range .
D. Broemmel🇩🇪 · P.R. Crompton🇩🇪 · C. Gattringer🇩🇪 · L.Ya. Glozman🇦🇹 · C.B. Lang🇦🇹 · A. Schaefer🇩🇪 · S. Schaefer🇩🇪
We report on our preliminary results on the low-lying excited nucleon spectra which we obtain through a variational basis formed with three different interpolators.
G. Akemann🇫🇷 · T. Wettig🇺🇸
We present a quantitative analysis of the microscopic Dirac spectrum which is complex in the presence of a non-vanishing quark chemical potential. Data from quenched SU(3) lattice simulations for different volumes V and small values of the chemical potential are compared to analytical predictions from matrix models. We confirm the existence of two distinct limits for weakly and strongly nonhermitian Dirac operators. Good agreement is found in both limits, confirming the different scaling of chemical potential and eigenvalues with the volume.
P. Majumdar🇩🇪 · Y. Koma🇩🇪 · M. Koma🇩🇪
The multi-level algorithm allows, at least for pure gauge theories, reliable measurement of exponentially small expectation values. The implementation of the algorithm depends strongly on the observable one wants to measure. Here we report measurement of glueball masses using the multi-level algorithm in 4 dimensional compact U(1) theory as a case study.
J. Shigemitsu🇺🇸 · C.T.H. Davies🇬🇧 · A. Gray🇬🇧 · E. Gulez · G.P. Lepage🇺🇸 · M. Wingate🇺🇸
We report on exploratory studies of heavy-light meson semileptonic decays using Asqtad light quarks, NRQCD heavy quarks and Symanzik improved glue on coarse quenched lattices. Oscillatory contributions to three-point correlators coming from the staggered light quarks are found to be handled well by Bayesian fitting methods. B meson decays to both the Goldstone pion and to one of the point-split non-Goldstone pions are investigated. One-loop perturbative matching of NRQCD/Asqtad heavy-light currents is incorporated.
We discuss the connection between supersymmetric field theories and topological field theories and show how this connection may be used to construct local lattice field theories which maintain an exact supersymmetry. It is shown how metric independence of the continuum topological field theory allows us to derive the lattice theory by blocking out of the continuum in a deformed geometry. This, in turn, allows us to prove the cut-off independence of certain supersymmetric Ward identities.
* 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.