Mirror matter admixtures in K_S to gamma gamma

The latest measurement of the K_S to gamma gamma branching ratio clearly shows an enhancement over the current theoretical prediction. As in other K and B meson decays, this invites to consider the possibility of the contribution of new physics. We study a particular form of the latter, which may be referred to as manifest mirror symmetry. The experimental data are described using previously determined values for the mixing angles of the admixtures of mirror matter in ordinary hadrons and by assuming that for pi^0, eta, eta', the mirror decay amplitudes have the same magnitudes as their ordinary counterparts

Symmetry limit properties of a priori mixing amplitudes for non-leptonic and weak radiative decays of hyperons

We show that the so-called parity-conserving amplitudes predicted in the a priori mixing scheme for non-leptonic and weak radiative decays of hyperons vanish in the strong-flavor symmetry limit

An explanatory and predictive PLS-SEM approach to the relationship between organizational culture,organizational performance and customer loyalty: The case of health clubs

Purpose This study aims to analyze the impact and predictive capacity of organizational culture on both customer loyalty and organizational performance in health clubs using data from managers and customers of health clubs in Spain. Design/methodology/approach A total of 101 managers were asked to measure organizational culture and organizational performance and 2,931 customers were asked to indicate their customer loyalty. The proposed hypotheses were tested and their predictability assessed through PLS-SEM. A composite concept was adopted to analyze the relationships between the different constructs and their indicators. Findings The findings suggest that organizational culture has a positive relationship with both customer loyalty and organizational performance. The four main dimensions of organizational culture that influence this relationship are, in order of significance, organizational presence, formalization, atmosphere and service-equipment. The authors’ model has a very good predictive power for both dependent variables. Originality/value Customer loyalty is an aspect of health clubs that can be improved. This study highlights the importance of creating a strong organizational culture in health clubs, as it enhances and predicts customer loyalty and organizational performance. Its predictability has already been tested with samples of managers and customers, with the analysis being performed from the perspective of the organization’s management and customer perceptions. This study also contributes to the field of sport management, using a predictive PLS-SEM techniqu

Una Especie Nueva de Tillus Olivier, 1790 (Coleoptera Cleridae) de la Peninsula Ibérica

6 páginas, 2 figuras et al..[EN] Tillus ibericus sp. nov. is described from the Comunidad Autónoma de Madrid (Spain) and it is compared to the western Palaearctic species of the genus Tillus Olivier, 1790. Tillus ibericus is easily distinguished from all other species of the genus by the structure of the elytral sculpture and its characteristic coloration. This new species shares a general habitus and characters from the antennae, and general body stucture with T. flabellicornis Fairmaire, 1866, a species from northern Africa. All preexisting records of T. flabellicornis in the Iberian Peninsula correspond to T. ibericus.[ES]Se describe Tillus ibericus sp. nov. de la Comunidad Autónoma de Madrid (España) y se compara con las otras especies del género Tillus Olivier, 1790 de la región Paleártica occidental. Tillus ibericus se distingue con facilidad de las especies próximas por la estructura del punteado elitral y por su coloración característica. La especie nueva comparte un aspecto general y caracteres de la estructura del cuerpo y de las antenas con T. flabellicornis Fairmaire, 1866 del Norte de África. Todas las citas anteriores de T. flabellicornis de la Península Ibérica corresponden a T. ibericus sp. nov.Peer reviewe

A priori mixing of mesons and the |Delta I|=1/2 rule in K\to\pi\pi

We consider the hypothesis of a priori mixings in the mass eigenstates of mesons to obtain the |Delta I|=1/2 rule in K\to\pi\pi. The Hamiltonian responsible for the transition is the strong interacting one. The experimental data are described using the isospin symmetry relations between the strong coupling constants

Max-phase slurry coatings for high temperature oxidation protection of ti based alloys

It is a well-known fact that degradation of materials due to phenomena such as oxidation, corrosion or wear may result in early deterioration of a material. This deterioration can turn out to be very expensive in industries such as the Aerospace one, where the price of a piece can reach soaring figures and where the unexpected failure of a component can result catastrophic. Titanium is a material widely used in the aerospace industry thanks to its good mechanical properties (high strength, low density and excellent corrosion resistance); however one of its drawbacks is its poor oxidation resistance at high temperatures. The purpose of this project is to be able to provide titanium with a coating capable of allowing it to improve its oxidation resistance. MAX phases on the other hand are relatively new materials with a Mn+1AXn stochoimetry, where M is a metal, A is an A-group element and X is N or C. They are layered crystalline compounds with a hexagonal structure. These ternary phases are characterized by having extraordinary physical, chemical and mechanical properties related with their nanolayered structure. Among their properties their excellent high-temperature mechanical properties and their oxidation resistance makes them quite promising. In this project, the slurry coating method has been used to develop the coatings, using as a donor material MAX-phases on Ti-6Al-4V alloy. The reasons for choosing this alloy is that it is the most used titanium alloy in the Aerospace sector. The samples were to be coated using two different kinds of MAX-phase slurries: Ti3SiC2 and Ti2AlC, respectively. The slurry diffusion treatment of the samples was carried out at different temperatures. Subsequently, samples were oxidized in static air at 600℃ for 300 hours. Characterization of the samples was performed by X-ray diffraction and Scanning electron Microscopy.Ingeniería Aeroespacia