Effective Hadron Dynamics: From Meson Masses to the Proton Spin Puzzle

We construct a three flavor chiral Lagrangian of pseudoscalars and vectors with special emphasis on the symmetry breaking terms. Comparing tree level two and three point functions with experiment allows us to first, fix the parameters of the model (including the light quark mass ratios) and second, to predict $m(K^{*+})-m(K^{*\circ}),\, \Gamma(K^*\rightarrow K\pi)$ and $\Gamma(\phi\rightarrow K {\overline K})$. The last mentioned quantities come out reasonably well, in contrast to an ``ordinary" $SU(3)$ treatment. For this purpose we need ``second order" symmetry breakers involving the vector fields analogous to those needed for the chiral perturbation theory program with only pseudoscalars. An improved description of the $\eta-\eta^\prime$ system is also given. We then use the soliton sector of this improved chiral Lagrangian to investigate some aspects of baryon physics which are especially sensitive to symmetry breaking. For this purpose a fairly elaborate ``cranking" techinque is employed in connection with the collective Hamiltonian. In addition to the ``strong" baryon mass spectrum a careful investigation is made of the non-electromagnetic part of the neutron-proton mass difference. This work is needed to improve our previous estimates concerning the two component approach to the ``proton spin" puzzle. We find that both the ``matter" and ``glue" contributions are small but they do tend to cancel each other.Comment: 33 pages, LaTe

ONTOLOGY IN DIALOGUE

In its first section the volume contains contributions dealing with the debate between the German philosopher Markus Gabriel and some scholars in Palermo who discussed the fundaments of his ontology. In the next sections are gathered essays on critical ontology in the modern age, essays on intersubjectivity in social ontology and on ontology of arts and aesthetics

Putative Light Scalar Nonet

We investigate the "family" relationship of a possible scalar nonet composed of the a_0(980), the f_0(980) and the \sigma and \kappa type states found in recent treatments of \pi\pi and \pi K scattering. We work in the effective Lagrangian framework, starting from terms which yield "ideal mixing" according to Okubo's original formulation. It is noted that there is another solution corresponding to dual ideal mixing which agrees with Jaffe's picture of scalars as qq\bar q \bar q states rather than as q\bar q states. At the Lagrangian level there is no difference in the formulation of the two cases (other than the numerical values of the coefficients). In order to agree with experiment, additional mass and coupling terms which break ideal mixing are included. The resulting model turns out to be closer to dual ideal mixing than to conventional ideal mixing; the scalar mixing angle is roughly -17 degrees in a convention where dual ideal mixing is 0 degrees.Comment: 24 pages, 3 figure

Nature umane

The volume contains contributions selected from the most relevant papers discussed at the forth edition of Ischia International Festival of Philosophy "La filosofia il castello e la torre". Spanning from biology to anthropology via philosophy of nature, computer sciences, sociology and literature, the various contributions provide with a complex image of today's notion of "human nature" and related issues

A che cosa serve la filosofia? Chi è il filosofo?

The volume includes contributions originally presented as individual papers at Ischia International Festival of Philosophy 2015 and dealing with the concept of philosophy from a multidisciplinary point of vie

Energy load Behaviours of Sicilian Hotel: methods for reducing the annual consumptions of bungalow hotels in the Mediterranean area

Starting from the analysis of the energy consumption of some typical Sicilian hotels, it has been possible to assess their annual energy load behaviours, by source type. In addition, it has been also developed a simple model of the annual consumption, by kind of energy load. This approach allowed the comparison of true load-type energy consumption with typical load-type benchmark values (e.g. lighting consumption). In turn, this allows the singling out of feasible methods for the reductions of the energy consumption; the found solutions take into account three fundamental issues: energy, economy and environment. Analysed buildings are represented by typical hotels of the Mediterranean area; as that, the data obtained will be comparable to that ones of similar geographical zones, such as the countries of the Mediterranean area. The analysis and the proposed energy consumption model allowed to single out the main problems to cope with when managing energy problems of hotel resorts. In addition, we propose here the use of renewable energy sources, having in mind the actions yearly assessed by U.E., in order to reduce national pollution releases and the foreign energy dependency