Baryon semileptonic decays: the Mexican contribution

We give a detailed account of the techniques to compute radiative corrections in baryon semileptonic decays developed over the years by Mexican collaborations. We explain how the method works by obtaining an expression for the Dalitz plot of semileptonic decays of polarized baryons including radiative corrections to order ${\mathcal O}(\alpha q/\pi M_1)$, where $q$ is the four-momentum transfer and $M_1$ is the mass of the decaying baryon. From here we compute the totally integrated spin angular asymmetry coefficient of the emitted baryon and compare its value with other results.Comment: 10 pages. Prepared for the Commemorative Volume of the Divison of Particles and Fields of the Mexican Physical Societ

The Mexican constitutional identity: Unbridgeable limit for the exercise of power

In this paper, it is questioned whether the constitutional identity, beyond what is explicitly expressed by the language in the Constitution, translates into the ideological values sheltered by the Mexican people through a federal pact and the understanding of the fundamentals in the constitutional field. Through this study we conclude that the defense of the constitutional identity is the ad intra and ad extra absolute limit. Ad intra, for the constituted powers and citizens; ad extra, for international organizations, the economic power and the market. In this sense, as long as the constitutional identity is not defended, a relative constitutionalism will be fueled.En este trabajo se cuestiona sobre si la identidad constitucional, más allá de lo explicitado por el lenguaje en el texto constitucional, se traduce en los valores ideológicos abrigados por el pueblo mexicano a través de un pacto federal y al entendimiento de lo fundamental en lo constitucional. A través de este estudio se concluye que la defensa de la identidad constitucional es el límite infranqueable ad intra y ad extra. Ad intra para los poderes constituidos y los ciudadanos; ad extra, para los órganos internacionales, el poder económico y de mercado. En este sentido, mientras no se defienda la identidad constitucional estaremos alimentando un constitucionalismo relativo

Learning&Information Technologies Cartography

Nowadays, many researches focus their efforts in studies and applications on the Learning area. However, there is a lack of a reference system that permits to know the positioning and the existing links between Learning and Information Technologies. This paper proposes a Cartography where explains the relationships between the elements that compose the Learning Theories and Information Technologies, considering the own features of the learner and the Information Technologies Properties. This intersection will allow us to know what Information Technologies Properties promote Learning Futures

A Look at Public Art: Examining the Importance of Public Art & How Cities are Making Their Collections More Accessible

The popularity of public art has grown in the past few decades; one of the main reasons for this is because public art brings a number of benefits to the city. Not only does public art create a more vibrant space for the residents of that city, it also helps attract businesses. The benefits that come with having public art have become evident to municipalities across the country, and in turn cities have started to invest more money and resources into their public art programs. One focus of these departments has been to develop a website that shows off their public art collection, and to develop a database that makes their public art even more accessible. In this paper I will examine the city of Austin’s public arts website, and contrast it with Minneapolis’ and Atlanta’s sites, as well as outline the importance of public art and how it has helped shaped Kansas City

Overcoming Years of Doubt

Yamilett Flores Martinez, an undergraduate student at California State University, Los Angeles, shares a couple of the most doubtful moments in her life. She unfolds her experiences with the uncertainty she felt about herself and the uncertainty others felt about her over the years. Martinez describes the influence of this hesitation and how, eventually, she loses her voice. In college, she finds her voice again and overcomes her sense of failure and self-doubt. Martinez concludes her narrative with the message that it won’t always be easy, but it is always possible to overcome your fears with an optimistic mindset

Establishment of seafarers training centre in Honduras

Public and political interest in quality, safety and the environment is growing steadily throughout the world. This increases the pressure on all organizations with responsibilities in the maritime field, at the same time underlines the need for organizations like Maritime Training Centers. This dissertation describes the real situation of the seafarers\u27 education in Honduras and the need for establishment of an institution that meets the global requirements. The description of minimum physical set up of the Training Center can be found in chapter two; the general course outlines are introduced for the General Purpose Rating and for the Catering Rating based on syllabuses already in progress in reputable Training Centers in Europe and the USA. I believe the success of the future years in our Maritime Administration will be due to the fact that the commitment to quality of education has been reached. This will give to all those who work for the development of our country great satisfaction and confidence in the future

Precision radiative corrections to the Dalitz plot of baryon semileptonic decays including the spin-momentum correlation of the decaying baryon and the emitted charged lepton

We calculate the radiative corrections to the angular correlation between the polarization of the decaying baryon and the direction of the emitted charged lepton in the semileptonic decays of spin one-half baryons to order (\alpha/\pi)(q/M_1). The final results are presented, first, with the triple integration of the bremsstrahlung photon ready to be performed numerically and, second, in an analytical form. A third presentation of our results in the form of numerical arrays of coefficients to be multiplied on the quadratic products of form factors is discussed. This latter may be the most practical one to use in Monte Carlo simulations. A series of crosschecks is performed. The results are useful in the analysis of the Dalitz plot of precision experiments involving light and heavy quarks and is not compromised to fixing the form factors at predetermined values. It is assumed that the real photons are kinematically discriminated. Otherwise, our results have a general model-independent applicability.Comment: 8 pages, RevTex4, 5 tables, no figures. Shortened version; results and conclusions remain unchange

Precision radiative corrections to the semileptonic Dalitz plot with angular correlation between polarized decaying and emitted baryons: Effects of the four-body region

Analytical radiative corrections of order (\alpha/\pi)(q/M_1) are calculated for the four-body region of the Dalitz plot of baryon semileptonic decays when the s_1 \cdot p_2 correlation is present. Once the final result is available, it is possible to exhibit it in terms of the corresponding final result of the three-body region following a set of simple changes in the latter. We cover two cases, a charged and a neutral polarized decaying baryon.Comment: Revtex4, 7 pages, no figure