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We discuss the lattice formulation of gauge theories with fermions in arbitrary representations of the color group, and present in detail the implementation of the HMC/RHMC algorithm for simulating dynamical fermions. Working with two flavors of Wilson fermions in the adjoint representation, we start mapping the phase diagram of the SU(2) theory.… (More)

- Luigi Del Debbio, Leonardo Giusti, Claudio Pica
- Physical review letters
- 2005

We compute the topological susceptibility for the SU(3) Yang-Mills theory by employing the expression of the topological charge density operator suggested by Neuberger's fermions. In the continuum limit we find r(4)(0)chi = 0.059(3), which corresponds to chi = (191 +/- 5 MeV)(4) if F(K) is used to set the scale. Our result supports the Witten-Veneziano… (More)

- Guido Cossu, Massimo D’Elia, Adriano Di Giacomo, Biagio Lucini, Claudio Pica
- 2007

The gauge group being centreless, G 2 gauge theory is a good laboratory for studying the role of the centre of the group for colour confinement in Yang-Mills gauge theories. In this paper, we investigate G 2 pure gauge theory at finite temperature on the lattice. By studying the finite size scaling of the plaquette, the Polyakov loop and their… (More)

We compute the masses of the π and of the ρ mesons in the quenched approximation on a lattice with fixed lattice spacing a ≃ 0.145 fm for SU(N) gauge theory with N = 2, 3, 4, 6. We find that a simple linear expression in 1/N 2 correctly captures the features of the lowest-lying meson states at those values of N. This enables us to extrapolate to N = ∞ the… (More)

- Giuseppe Lacagnina, Guido Cossu, Massimo D’Elia, Adriano Di Giacomo, Claudio Pica
- 2008

Two distinct phase transitions occur at different temperatures in QCD with adjoint fermions (aQCD): deconfinement and chiral symmetry restoration. In this model, quarks do not explicitly break the center Z(3) symmetry and therefore the Polyakov loop is a good order parameter for the deconfinement transition. We study monopole condensation by inspecting the… (More)

The chiral symmetry at finite lattice spacing of Ginsparg-Wilson fermionic actions constrains the renormalization of the lattice operators; in particular, the topological susceptibility does not require any renormalization, when using a fermionic estimator to define the topological charge. Therefore, the overlap formalism appears as an appealing candidate… (More)

- J M Carmona, M D 'elia, +4 authors C Pica
- 2002

We report on evidence from lattice simulations that confinement is produced by dual su-perconductivity of the vacuum in full QCD as in quenched QCD. Preliminary information is obtained on the order of the deconfining phase transition.

We discuss the lattice formulation of gauge theories with fermions in arbitrary representations of the color group, and present the implementation of the RHMC algorithm for simulating dynamical Wilson fermions. A first dataset is presented for the SU(2) gauge theory with two fermions in the adjoint representation, which has been proposed as a possible… (More)

- M D 'elia, A Di Giacomo, C Pica
- 2004

The order of the chiral transition for N f = 2 is an interesting probe of the QCD vacuum. A strategy is developed to investigate the order of the transition using finite size scaling and its relation to color confinement. An in-depth numerical investigation has been performed with KS fermions on lattices with Nt = 4 and Ns = 12, 16, 20, 24, 32 and quark… (More)

- M. D’Elia, A. Di Giacomo, C. Pica
- 2005

The study of QCD with two light dynamical fermions is of fundamental importance to understand the mechanism of color confinement. We present results of a numerical investigation on the order of the chiral phase transition with N f = 2 by use of a novel strategy in finite size scaling analysis. We compare the critical behaviour of the specific heat, of the… (More)