14.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of PisaIT5.2k papers
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23 papers · 2 filters
Topology in QCD with 4 flavours of dynamical fermions
B. Alles, M. D'Elia, A. Di Giacomo
We study the topological properties of full QCD with four flavours of dynamical staggered fermions. In particular the topological susceptibility is measured and the problem of the…
Bilocal Dynamics for Self-Avoiding Walks
Sergio Caracciolo, Maria Serena Causo, Giovanni Ferraro +2
We introduce several bilocal algorithms for lattice self-avoiding walks that provide reasonable models for the physical kinetics of polymers in the absence of hydrodynamic effects.…
Lattice QCD and chiral mesons
Sergio Caracciolo, Fabrizio Palumbo, Roberto Scimia
The standard QCD action is improved by the addition of irrelevant operators built with chiral composites. An effective Lagrangian is derived in terms of auxiliary fields, which has…
End-to-end distribution function for dilute polymers
Sergio Caracciolo, Maria Serena Causo, Andrea Pelissetto
We study the end-to-end distribution function for dilute polymers. We present a computation to order , , and discuss in detail its asymptotic behaviour for small…
Hadron masses and decay constants in quenched QCD
M. Goeckeler, R. Horsley, D. Petters +4
We present results for the mass spectrum and decay constants using non-perturbatively O(a) improved Wilson fermions. Three values of and 30 different quark masses are used to o…
Lambda-parameter of lattice QCD with the overlap-Dirac operator
C. Alexandrou, H. Panagopoulos, E. Vicari
We compute the ratio between the scale parameter , associated with a lattice formulation of QCD using the overlap-Dirac operator, and of the…
Composite operators from the operator product expansion: what can go wrong?
Sergio Caracciolo, Andrea Montanari, Andrea Pelissetto
The operator product expansion is used to compute the matrix elements of composite renormalized operators on the lattice. We study the product of two fundamental fields in the two-…
Topology in CP(N-1) models: a critical comparison of different cooling techniques
B. Alles, L. Cosmai, M. D'Elia +1
Various cooling methods, including a recently introduced one which smoothes out only quantum fluctuations larger than a given threshold, are applied to the study of topology in 2d…
Centre vortices and their friends
P. W. Stephenson
We report two probes of centre vortices in pure SU(2). First, we attempt to generate plaquette-size Z(2) vortices in a quasi-random way to compare the structure with those of proje…
The Role of Center Vortices in QCD
C. Alexandrou, Ph. de Forcrand, M. D'Elia
Center vortices are unambiguously identified after Laplacian Center Gauge fixing and their influence on confinement and chiral symmetry breaking is investigated on a sample of SU(2…
Improved Multiboson Algorithm
C. Alexandrou, Ph. de Forcrand, M. D'Elia +1
We compare the performance of an UV-filtered Multiboson algorithm, including a global quasi-heatbath update, to the standard Hybrid Monte Carlo algorithm in full QCD with two flavo…
Light quark masses from the lattice
M. Gockeler, R. Horsley, B. Klaus +7
A completely non-perturbative estimate is given for the u/d and strange quark masses in quenched QCD using O(a) improved fermions and, for comparison, Wilson fermions. For improved…
A Lattice Determination of Light Quark Masses
M. Gockeler, R. Horsley, H. Oelrich +5
A fully non-perturbative lattice determination of the up/down and strange quark masses is given for quenched QCD using both, improved Wilson fermions and ordinary Wilson fer…
Confinement in QCD
A. Di Giacomo
The guiding lines of lattice investigations on colour confinement are reviewed, together with recent results.
The relevance of center vortices
C. Alexandrou, M. D'Elia, Ph. de Forcrand
We show remnants of chiral symmetry breaking in the center-projected theory. We construct and study an unambiguous definition of center vortices.
What we do understand of Colour Confinement
A. Di Giacomo
A review is presented of what we understand of colour confinement in QCD. Lattice formulation provides evidence that QCD vacuum is a dual superconductor: the chromoelectric field o…
Four-loop contributions to long-distance quantities in the two-dimensional nonlinear sigma-model on a square lattice: revised numerical estimates
B. Alles, S. Caracciolo, A. Pelissetto +1
We give the correct analytic expression of a finite integral appearing in the four-loop computation of the renormalization-group functions for the two-dimensional nonlinear sigma-m…
Colour confinement and dual superconductivity of the vacuum - II
A. Di Giacomo, B. Lucini, L. Montesi +1
The dual superconductivity of the vacuum in SU(3) gauge theory is investigated by constructing a disorder parameter which signals monopole condensation in various abelian projectio…
Colour confinement and dual superconductivity of the vacuum - I
A. Di Giacomo, B. Lucini, L. Montesi +1
We study dual superconductivity of the ground state of SU(2) gauge theory, in connection with confinement. We do that measuring on the lattice a disorder parameter describing conde…
A dual view of the 3d Heisenberg model and the abelian projection
A. Di Giacomo, D. Martelli, G. Paffuti
The Heisenberg model in 3d is studied from a dual point of view. It is shown that it can have vortex configurations, carrying a conserved charge(U(1) symmetry). Vortices condens in…
Breaking of the adjoint string in 2+1 dimensions
P. W. Stephenson
The roughly linear rise of the potential found between adjoint sources in SU(N) in lattice simulations is expected to saturate into a state of two `gluelumps' due to gluonic screen…
On the relevance of center vortices to QCD
Ph. de Forcrand, M. D'Elia
In a numerical experiment, we remove center vortices from an ensemble of lattice SU(2) gauge configurations. This removal adds short-range disorder. Nevertheless, we observe long-r…
The Euclidean two-point correlation function of the topological charge density
Ettore Vicari
We study the Euclidean two-point correlation function of the topological charge density in QCD. A general statement based on reflection positivity tells us that …