Photon induced Lambda(1520) production and the role of the K^* exchange

We study the photon induced Lambda(1520) production in the effective Lagrangian method near threshold, E_\gamma^{LAB}<2 GeV, and in the quark-gluon string model at higher energies 3 GeV < E_\gamma^{LAB} < 5 GeV. In particular, we study the role of the K^* exchange for the production of Lambda(1520) within the SU(6) Weinberg-Tomozowa chiral unitary model proposed in Phys. Rev. D74 (2006) 034025. The coupling of the Lambda(1520) resonance to the N \bar K^* pair, which is dynamically generated, turns out to be relatively small and, thus, the K exchange mechanism dominates the reaction. In the higher energy region, where experimental data are available, the quark-gluon string mechanism with the K Regge trajectory reproduces both the energy and the angular distribution dependences of the Lambda(1520) photo-production reaction.Comment: 20 pages and 6 page

Renormalization of vector fields with mass-like coupling in curved spacetime

Using the method of covariant symbols we compute the divergent part of the effective action of the Proca field with non-minimal mass term. Specifically a quantum abelian vector field with a non-derivative coupling to an external tensor field in curved spacetime in four dimensions is considered. Relatively explicit expressions are obtained which are manifestly local but non polynomial in the external fields. Our result is shown to reproduce existing ones in all particular cases considered. Internal consistency with Weyl invariance is also verified.This work has been partially supported by the Spanish MINECO (Grant no. FIS2017-85053-C2-1-P) and by the Junta de Andalucía (Grant no. FQM-225). This study has been partially financed by the Consejería de Conocimiento, Investigación y Universidad, Junta de Andalucía and European Regional Development Fund (ERDF), ref. SOMM17/6105/UGR

Deeply bound levels in kaonic atoms

Using a microscopic antikaon-nucleus optical potential recently developed by Ramos and Oset [10] from a chiral model, we calculate strong interaction energy shifts and widths for K- atoms. This purely theoretical potential gives an acceptable description of the measured data (chi(2)/num.data = 3.8), though it turns out to be less attractive than what can be inferred from the existing kaon atomic data. We also use a modified potential, obtained by adding to the latter theoretical one a s-wave term which is fitted to known experimental kaonic data (chi(2)/degree of freedom = 1.6), to predict deeply bound K- atomic levels, not yet detected. This improved potential predicts, in general, states even narrower than those recently reported by Friedman and Gal [9]. This reinforces the idea that these deeply atomic states can be detected and resolved by using suitable nuclear reactions. Besides, we also study K- and (K) over bar(0) nuclear bound states and compute binding energies and widths, for both species of antikaons, in C-12, Ca-40 and Pb-208. Despite of restricting our study only to potentials obtained from best fits to the known kaonic atom data, the dynamics of these nuclear bound states depends dramatically on the particular optical potential used

SU(6) extension of the Weinberg-Tomozawa meson-baryon Lagrangian

A consistent SU(6) extension of the Weinberg-Tomozawa meson-baryon chiral Lagrangian is constructed which incorporates vector meson and baryon decuplet degrees of freedom. The corresponding Bethe-Salpeter approximation predicts the existence of an isoscalar spin-parity 3/2 K(*)N bound state (strangeness +1) with a mass around 1.7-1.8 GeV. It is the highest hypercharge state of an antidecuplet SU(3) representation and it is unstable through K(*) decay. The estimated width of this state (neglecting d-wave KN decay) turns out to be small (Gamma (K) over bar (0)pK(+)pi(-) by looking at the three body pK(+)pi(-) invariant mass

S = -1 meson-baryon scattering in coupled-channel unitarized Chiral Perturbation Theory

The s-wave meson-baryon scattering amplitude is analyzed for the strangeness S = -1 and isospin I = 0 sector in a Bethe-Salpeter coupled-channel formalism incorporating Chiral Symmetry. Four two-body channels have been considered: (K) over barN, piSigma, etaLambda, KXi. The needed two-particle irreducible matrix amplitude is taken from lowest-order Chiral Perturbation Theory in a relativistic formalism. Off-shell behaviour is parameterized in terms of low-energy constants, which outnumber those assumed in previous works and provide a better fit to the data. The position of the complex poles in the second Riemann sheet of the scattering amplitude determines masses and widths of the Lambda(1405) and Lambda(1670) resonances which compare well with accepted numbers

CP violation in the effective action of the Standard Model

Following a suggestion by Smit, the CP odd terms of the effective action of the Standard Model, obtained by integration of quarks and leptons, are computed to sixth order within a strict covariant derivative expansion approach. No other approximations are made. The final result so derived includes all Standard Model gauge fields and Higgs. Remarkably, at the order considered in this work, all parity violating contributions turn out to be zero. Non vanishing CP violating terms are obtained in the C-odd P-even sector. These are several orders of magnitude larger than perturbative estimates. Various unexpected regularities in the final result are noted.Comment: 32 pages, no figures. Section added. To appear in JHE

Creencias populares sobre la menstruación y el trabajo

La menstruación sigue siendo vivida aún hoy por muchas mujeres como trauma, ya que todavía existen creencias populares en torno a la misma que pueden llegar a actuar como modificadores de la conducta. Quizás porque los mitos han dotado a la mujer menstruante con toda clase de poderes sobrenaturales, desde curativos hasta destructivos. El hecho de que durante ese periodo se les privase de acceso a ciertas actividades tuvo múltiples efectos, tanto estigmatizantes como terapéuticos, condicionados por la vivencia negativa que obliga a las mujeres a esconder la existencia del flujo menstruante porque se consideraba que era sucio, impuro o tóxico. En esta investigación se ha planteado conocer las creencias populares de las mujeres relacionadas con la menstruación y con el trabajo. El enfoque ha sido el conocimiento de estas creencias y de sus prácticas desde el punto de vista de las propias mujeres. Al ser, por esta razón, un estudio subjetivista la metodología elegida ha sido la cualitativa, con el objetivo de descubrir cuáles son sus creencias, practicas, recursos fortalezas y estrategias

Quercus airborne pollen tendencies in the south of Iberian Peninsula, its correlation with meteorological trends and possible effect of the climatic change in Mediterranean forests

Resumen enviado, aceptado y publicado en el libro de resúmenes titulado "Pollen3013. 2nd International APLE APLF Congres", celebrado en septiembre de 2'13 en Madrid.Universidad de Málag

Effectiveness of a multifactorial intervention in increasing adherence to the mediterranean diet among patients with diabetes mellitus type 2: a controlled and randomized study (EMID Study)

The Mediterranean diet (MD) is recognized as one of the healthiest dietary patterns and has benefits such as improving glycaemic control among patients with type 2 diabetes (T2DM). Our aim is to assess the effectiveness of a multifactorial intervention to improve adherence to theMD, diet quality and biomedical parameters. The EMID study is a randomized and controlled clinical trial with two parallel groups and a 12-month follow-up period. The study included 204 subjects between 25–70 years with T2DM. The participants were randomized into intervention group (IG) and control group (CG). Both groups received brief advice about healthy eating and physical activity. The IG participants additionally took part in a food workshop, five walks and received a smartphone application for three months. The population studied had a mean age of 60.6 years. At the 3-month follow-up visit, there were improvements in adherence to the MD and diet quality of 2.2 and 2.5 points, compared to the baseline visit, respectively, in favour of the IG. This tendency of the improvement was maintained, in favour of the IG, at the 12-month follow-up visit. In conclusion, the multifactorial intervention performed could improve adherence to the MD and diet quality among patients with T2DM.Regional Health Management through the 2016 grants to carry out research projects in biomedicine, health management and socio-health care (GRS 1276/B/16), the 2016 program for the professional development of nurses in their research activity (BOCYL-D-11022016-2) and the 2015 incentive program for nurses who have completed their residency (ORDER SAN / 360/2015). The study was also co-financed by the Carlos III Health Institute and the European Regional Development Fund (ERDF) (RD 16/0007/0003)

Carbon-based biomass-derived catalysts for deoxygenation of fast pyrolysis bio-oil

Producing energy and chemicals from biomass is an interesting alternative for replacing conventional fossil sources with a renewable feedstock while enabling zero net greenhouse gases emissions. Particularly, fast pyrolysis of biomass waste enables the production of bio-oil, which can be upgraded to biofuels or value-added chemicals. The sustainability of this process can be enhanced by preparing carbon-based catalysts from the same biomass waste used as raw material for the biooil production, decreasing the inputs of the process and allowing recovery and recycle of the active phase by combustion of the carbon substrate. In this work, catalytic fast pyrolysis of olive stone residues was studied using mesoporous carbon-based acid catalysts prepared by activation with H3PO4 of olive stones.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech