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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 correctly captures the features of the lowest-lying meson states at those values of N . This enables us to extrapolate to N = ∞ the… (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)

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)

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)

- Giuseppe Lacagnina, G. 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 order of the chiral transition for Nf = 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)

- G. Cossu, Massimo D’Elia, Adriano Di Giacomo, Claudio Pica
- 2007

We complete our analysis of N f =2 QCD based on the lattice staggered fermion formulation. Using a series of Monte Carlo simulations at fixed mLL yh s one is able to test the universality class with given critical exponent yh. This strategy has been used to test the O(4) universality class and it has been presented at the previous Lattice conferences. No… (More)

- Ed Bennett, Luigi Del Debbio, +4 authors Antonio Rago
- ArXiv
- 2014

- G. Cossu, Claudio Bonati, Massimo D’Elia, Adriano Di Giacomo, Claudio Pica
- 2008

We present the status of our analysis on the order of the finite temperature transition in QCD with two flavors of degenerate fermions. Our new simulations on large lattices support the hypothesis of the first order nature of the transition, showing a preliminary two state signal. We will discuss the implications and the next steps in our analysis.

- G. Cossu, Claudio Bonati, Massimo D’Elia, Adriano Di Giacomo, Claudio Pica
- 2008

We present the status of our analysis on the order of the finite temperature transition in QCD with two flavors of degenerate fermions. Our new simulations on large lattices support the hypothesis of the first order nature of the transition, showing a preliminary two state signal. We will discuss the implications and the next steps in our analysis.