Hard Inelastic Interactions at Parton and Hadron Level

In the study of multiple scattering of partons in hadron-hadron collisions the possibility of a hard inelastic process at the parton level is included in its simplest possible way, $i.e.$ including the $2 \to 3$ transition. The specific physical process to which the treatment is applied is the inelastic collision of a nucleon with a heavy nucleusComment: 4 pages, talk given at XXXI International Symposium on Multiparticle Dynamics, Sept 1-7, 2001, Datong China. URL http://ismd31.ccnu.edu.cn

Entanglement, Superselection Rules and Supersymmetric Quantum Mechanics

In this paper we show that the energy eigenstates of supersymmetric quantum mechanics (SUSYQM) with non definite "fermion" number are entangled states. They are "physical states" of the model provided that observables with odd number of spin variables are allowed in the theory like it happens in the Jaynes-Cummings model. Those states generalize the so called "spin spring" states of the Jaynes-Cummings model which have played an important role in the study of entanglement.Comment: 2 words added in the title, a section (IV) added in the text, a new author joined the projec

Cronin effect and energy conservation constraints in pA collisions at LHC and RHIC

We evaluate the Cronin effect in pA collisions at the CERN LHC and at RHIC in the framework of Glauber-Eikonal model of initial state multiparton interactions. Taking carefully into account all kinematical constraints of each multi-parton interaction process we obtain a softening of the spectrum of produced partons, improving in this way the agreement of the model with the recent measurements of pi0 production in d+Au collisions at sqrt{s}=200 AGeV.Comment: Proceeding of 34th International Symposium on Multiparticle dynamics (ISMD), Sonoma California, 26th-1st Aug 2004, to be published in Acta Phisica Polonica

Historias rojas: Los intelectuales comunistas y el pasado nacional en los años 1930s

En este artículo estudiaremos las interpretaciones del pasado que los intelectuales comunistas plantearon en la Argentina entre 1930 y 1943. El cambio crucial en las mismas, que hizo posible una lectura comunista desplegada del pasado argentino, se explica por un proceso de incorporación del Partido Comunista al campo político nacional, más importante y profundo que los sucesivos cambios de línea tácticos decididos por la Internacional.In this article we will analyse the interpretations of the past offered by the communist intellectuals in Argentina between 1930 and 1943. We argue that the most important change in those interpretations -which made a detailed communist vision of the national past possible- must be explained by the incorporation of the Communist Party to the national political field during this period: a more important and deeper process than the various tactical changes decided by the Communist International.Fil: Cattaruzza, Alejandro. Universidad Nacional de Rosario; Argentina. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Colour Perception Between Psychology and Art

The poster refers to important contributions of psychological research on colours. Special emphasis is given to the fundamental classification proposed by David Katz, who strongly influenced subsequent studies; e.g., those by Karl Bühler and Gaetano Kanizsa. In particular, the opposition between diaphanic and epiphanic colours is discussed and applied to two recent paintings of a contemporary experimental artist

Una empresa cultural del primer peronismo: la Revista «Hechos e Ideas» (1947 - 1955)

Sin resume

Least-action principle and path-integral for classical mechanics

In this paper we show how the equations of motion of a superfield, which makes its appearance in a path-integral approach to classical mechanics, can be derived without the need of the least-action principleComment: to appear IN PHYS.REV.D (Brief Report