Chiral transition of fundamental and adjoint quarks

The chiral symmetry breaking transition of quarks in the fundamental and adjoint representation is studied in a model where the gap equation contains two contributions, one containing a confining propagator and another corresponding to the exchange of one-dressed dynamically massive gluons. When quarks are in the fundamental representation the confinement effect dominates the chiral symmetry breaking while the gluon exchange is suppressed due to the dynamical gluon mass effect in the propagator and coupling constant. In this case the chiral and deconfinement transition temperatures are approximately the same. For quarks in the adjoint representation, due to the larger Casimir eigenvalue, the gluon exchange is operative and the chiral transition happens at a larger temperature than the deconfinement one.Comment: 12 pages, 1 figure, improved discussio

QCD chiral symmetry restoration with a large number of quarks in a model with a confining propagator and dynamically massive gluons

Considering a QCD chiral symmetry breaking model where the gap equation contains an effective confining propagator and a dressed gluon propagator with a dynamically generated mass, we verify that the chiral symmetry is restored for a large number of quarks $n_{f}\approx 7-13$. We discuss the uncertainty in the results, that is related to the determination of the string tension ($K_{F}$), appearing in the confining propagator, and the effective gluon mass ($m_{g}$) at large $n_{f}$.Comment: 5 pages, 6 figure

Diffraction and the Gluon Mass

We recently proposed a QCD-Pomeron described by the exchange of two non-perturbative gluons characterized by a dynamically generated gluon mass. It is here shown that data on elastic scattering, exclusive $\rho$ production in deep inelastic scattering and the $J/\Psi$-nucleon total cross-section can be successfully described in terms of a single gluon mass $m_g\simeq0.37$~GeV. We observe that the total cross sections of hadrons with small radii, such as $J/\Psi$, have a marked dependence on the effective gluon mass.Comment: 10 pages, Latex, 3 figures available by fax or conventional mail. MAD/PH/75

The small xx behavior of the gluon structure function from total cross sections

Within a QCD-based eikonal model with a dynamical infrared gluon mass scale we discuss how the small $x$ behavior of the gluon distribution function at moderate $Q^{2}$ is directly related to the rise of total hadronic cross sections. In this model the rise of total cross sections is driven by gluon-gluon semihard scattering processes, where the behavior of the small $x$ gluon distribution function exhibits the power law $xg(x,Q^2)= h(Q^2)x^{-\epsilon}$. Assuming that the $Q^{2}$ scale is proportional to the dynamical gluon mass one, we show that the values of $h(Q^2)$ obtained in this model are compatible with an earlier result based on a specific nonperturbative Pomeron model. We discuss the implications of this picture for the behavior of input valence-like gluon distributions at low resolution scales.Comment: 19 pages, 3 figures; revised version; to appear in Int. J. Mod. Phys.

Sacra et Pretiosa - Oreficeria dai monasteri di Palermo Capitale

Si presenta il percorso della mostra articolata in due momenti Sacra et pretiosa. La prima parte, "Il monastero di Santa Caterina nel cuore di Palermo Capitale", ha valorizzato gli ambienti del monastero, facendoli rivivere attraverso la contestualizzazione di arredi originali ed opere d\u2019arte ancora esistenti e restituendo al loro contesto originario gli oggetti di uso quotidiano, le suppellettili liturgiche, gli arredi e le opere d\u2019arte che ne compongono lo straordinario patrimonio. La seconda Mostra, "Oreficeria dai monasteri di Palermo Capitale", propone una selezione di capolavori dell\u2019oreficeria siciliana realizzati tra XVI e XIX secolo, commissionati dagli ordini monastici nel contesto della citt\ue0It presents the path of the exhibition articulated in two moments Sacra et pretiosa. The first part, "The monastery of St. Catherine in the heart of Palermo Capital", has enhanced the rooms of the monastery, reviving them through the contextualization of original furnishings and works of art still existing and returning to their original context the objects of daily use, liturgical furnishings, furnishings and works of art that make up the extraordinary heritage. The second exhibition, "Goldsmithery from the monasteries of Palermo Capital", offers a selection of masterpieces of Sicilian goldsmithery made between the sixteenth and nineteenth centuries, commissioned by monastic orders in the context of the cit

Criteri di Museologia per il Museo Diocesano di Monreale

L'articolo espone i criteri museologici adottati nell'allestimento del Museo Diocesano di Monreale e a cui si \ue8 ispirato anche l'allestimento del Museo che conterr\ue0 le opere provenienti dall'abbazia di S. Maria del Bosco di Calatamauro sempre nel complesso del Duomo di Monreale, nel Dormitorio del convento prospiciente al chiostro in fase di realizzazione.The paper sets out the criteria adopted in museological setting of the Diocesan Museum of Monreale. They have also inspired the exhibition of the Museum, under construction, that will contain the works coming from the Abbey of Santa Maria del Bosco of Calatamauro. It will take place in the Dormitory of the Monastery overlooking the cloister, always in the complex of the Cathedral of Monreale

A novel CMB polarization likelihood package for large angular scales built from combined WMAP and Planck LFI legacy maps

We present a CMB large-scale polarization dataset obtained by combining WMAP Ka, Q and V with Planck 70 GHz maps. We employ the legacy frequency maps released by the WMAP and Planck collaborations and perform our own Galactic foreground mitigation technique, which relies on Planck 353 GHz for polarized dust and on Planck 30 GHz and WMAP K for polarized synchrotron. We derive a single, optimally-noise-weighted, low-residual-foreground map and the accompanying noise covariance matrix. These are shown, through $\chi^2$ analysis, to be robust over an ample collection of Galactic masks. We use this dataset, along with the Planck legacy Commander temperature solution, to build a pixel-based low-resolution CMB likelihood package, whose robustness we test extensively with the aid of simulations, finding excellent consistency. Using this likelihood package alone, we constrain the optical depth to reionazation $\tau=0.069^{+0.011}_{-0.012}$ at $68\%$ C.L., on 54\% of the sky. Adding the Planck high-$\ell$ temperature and polarization legacy likelihood, the Planck lensing likelihood and BAO observations we find $\tau=0.0714_{-0.0096}^{+0.0087}$ in a full $\Lambda$CDM exploration. The latter bounds are slightly less constraining than those obtained employing \Planck\ HFI CMB data for large angle polarization, that only include EE correlations. Our bounds are based on a largely independent dataset that does include also TE correlations. They are generally well compatible with Planck HFI preferring slightly higher values of $\tau$. We make the low-resolution Planck and WMAP joint dataset publicly available along with the accompanying likelihood code.Comment: The WMAP+LFI likelihood module is available on \http://www.fe.infn.it/u/pagano/low_ell_datasets/wmap_lfi_legacy