Fitting and selecting scattering data

The main purpose of scattering experiments is to unveil the underlying structure of the colliding particles and their interaction. Typically one measures scattering observables (cross sections and polarizations) at discrete angles and energies and mutually consistent data may validate or falsify proposed theories or models. However, the accumulation of data from different laboratories while potentially improves the statistical significance it may sometimes generate mutually inconsistent data as a side-effect. Thus, some decision has to be made on what are the maximal amount of data which are mutually compatible. We show elastic $\pi N$ and $NN$ scattering as prominent examples where this selection is called for. We discuss how it can be done in a self-consistent manner invoking a principle of maximal consensus of the database and with the help of a sufficiently flexible model involving a minimal number of theoretical assumptions. In the NN case this has become possible with a combination of long distance field theoretical constraints at the hadronic level such as pion exchanges and electromagnetic effects and a coarse graining of the unknown interaction over the shortest de Broglie wavelength being probed in the scattering process.Comment: 7 pages, 5 figures, talk presented by ERA at XVII International Conference on Hadron Spectroscopy and Structure - Hadron2017, Salamanca, 25-29 September 201

Diálogos con la cultura Guambiana desde la educación matemática

La investigación, tiene como objetivo develar asuntos fundantes de la enseñanza de las matemáticas en el marco de la cultura Guambiana. Para el alcance de esta propuesta es necesario recoger las experiencias vivas de sus actores, por ello se describe en forma sistemática aquellos aspectos de la docencia en los que coinciden los maestros del resguardo, con respecto a la enseñanza y aprendizaje de las matemáticas. El enfoque es cualitativo y la misma se encuentra dentro de la tipología de investigación histórica hermenéutica. Dentro de los primeros hallazgos se encuentran narraciones de líderes de la comunidad donde describen y hacen sus propias apreciaciones sobre la enseñanza llevada en la escuela y cómo se ha ido perdiendo la identidad cultural

NN Scattering and Nuclear Uncertainties

This work was supported by the Spanish MINECO and European FEDER funds (grant FIS2017-85053-C2-1-P) and Junta de Andalucía (grant FQM-225).We thank Ignacio Ruiz Simó, James Vary, Pieter Maris, Eduardo Garrido, Andreas Nogga, Rocco Schiavilla, Maria Piarulli, Pedro Fernández Soler, Jacobo Ruiz de Elvira, Varese Salvador Timoteo, and Sergio Szpigel for collaboration on different issues discussed in this paper.Ab initio calculations in Nuclear physics for atomic nuclei require a specific knowledge of the interactions among their constituents, protons and neutrons. In particular, NN interactions can be constrained down to scale resolutions of Δr ~ 0.6 fm from the study of phase shifts below the pion production threshold. However, this allows for ambiguities and uncertainties which have an impact on finite nuclei, nuclear- and neutron-matter properties. On the other hand the nuclear many body problem is intrinsically difficult and the computational cost increases with numerical precision and number of nucleons. However, it is unclear what the physical precision should be for these calculations. In this contribution we review much of the work done in Granada to encompass both the uncertainties stemming from the NN scattering database in light nuclei such as triton and alpha particle and the numerical precision required by the solution method.Spanish MINECO and European FEDER funds (grant FIS2017-85053-C2-1-P)Junta de Andalucía (grant FQM-225

Apunte sobre algunas de las últimas novedades normativas en diferentes ámbitos de la actividad mercantil

En este trabajo se realiza una presentación de las principales novedades normativas en el sector del Derecho Mercantil fruto de la actividad del legislador estatal en el año 2016. Para exponer estas novedades legislativas se ha seguido el criterio sistemático que atiende a la orde-nación tradicional de la materia mercantil.This paper presents a systemat-ic study of de most important legislative novelties in commercial law resulting from the activity of de spanish legislator during 2016. To exposethese legislative novelties have followed the systematic approach to the management serving traditional mer-cantile matters.Ministerio de Economía, Industria y Competitividad DER2017-84775-C2-1