Flavour physics of the RS model with KK masses reachable at LHC

The version of the higher-dimensional Randall-Sundrum (RS) model with matter in the bulk, which addresses the gauge hierarchy problem, has additional attractive features. In particular, it provides an intrinsic geometrical mechanism that can explain the origin of the large mass hierarchies among the Standard Model fermions. Within this context, a good solution for the gauge hierarchy problem corresponds to low masses for the Kaluza-Klein (KK) excitations of the gauge bosons. Some scenarios have been proposed in order to render these low masses (down to a few TeV) consistent with precision electroweak measurements. Here, we give specific and complete realizations of this RS version with small KK masses, down to 1 TeV, which are consistent with the entire structure of the fermions in flavour space: (1) all the last experimental data on quark/lepton masses and mixing angles (including massive neutrinos of Dirac type) are reproduced, (2) flavour changing neutral current constraints are satisfied and (3) the effective suppression scales of non-renormalizable interactions (in the physical basis) are within the bounds set by low energy flavour phenomenology. Our result, on the possibility of having KK gauge boson modes as light as a few TeV, constitutes one of the first theoretical motivations for experimental searches of direct signatures at the LHC collider, of this interesting version of the RS model which accommodates fermion masses.Comment: 27 pages, Latex file. References and comments adde

Proceso político y movimiento obrero en América Latina

Entre el triunfo de la Revolución Socialista Cubana, el ascenso al gobierno de la Unión Popular en Chile y el triunfo de la Revoluión Sandinista de Nicaragua, el fenómeno latinoamericano de mayor peso ha sido el de la crisis política en que tienen marco los movimientos de masas organizadas. Su consecuencia inmediata ha sido el agravamiento y mayor complejidad de los problemas del movimiento obrero en el Área. Ramón Martínez Escamilla, Marcos Kaplan, José María Calderón, Sergio Bagú, Julio Godio, Julio le Riverend e Irma Manrique ofrecen en Proceso político y movimiento obrero en América Latina un aporte fundamental a la reinterpretación que exige en nuestro tiempo tal estado de cosas

Fredholm methods for billiard eigenfunctions in the coherent state representation

We obtain a semiclassical expression for the projector onto eigenfunctions by means of the Fredholm theory. We express the projector in the coherent state basis, thus obtaining the semiclassical Husimi representation of the stadium eigenfunctions, which is written in terms of classical invariants: periodic points, their monodromy matrices and Maslov indices.Comment: 12 pages, 10 figures. Submitted to Phys. Rev. E. Comments or questions to [email protected]

Successful Yukawa structures in Warped Extra Dimensions

For a RS model, with SM fields in the bulk and the Higgs boson on the TeV-brane, we suggest two specific structures for the Yukawa couplings, one based on a permutation symmetry and the other on the Universal Strength of Yukawa couplings hypothesis (USY). In USY, all Yukawa couplings have equal strength and the difference in the Yukawa structure lies in some complex phase. In both scenarios, all Yukawa couplings are of the same order of magnitude. Thus, the main features of the fermion hierarchies are explained through the RS geometrical mechanism, and not because some Yukawa coupling is extremely small. We find that the RS model is particularly appropriate to incorporate the suggested Yukawa configurations. Indeed, the RS geometrical mechanism of fermion locations along the extra dimension, combined with the two Yukawa scenarios, reproduces all the present experimental data on fermion masses and mixing angles. It is quite remarkable that in the USY case, only two complex phases of definite value +-Pi/2 are sufficient to generate the known neutrino mass differences, while at same time, permitting large leptonic mixing in agreement with experiment.Comment: 11 page

On the chains of star complexes and superclouds in spiral arms

The relation is studied between occurrence of a regular chain of star complexes and superclouds in a spiral arm, and other properties of the latter. A regular string of star complexes is located in the north-western arm of M31; they have about the same size 0.6 kpc with spacing of 1.1 kpc. Within the same arm segment the regular magnetic field with the wavelength of 2.3 kpc was found by Beck et al. (1989). We noted that this wavelength is twice as large as the spacing between complexes and suggested that they were formed in result of magneto-gravitational instability developed along the arm. In this NW arm, star complexes are located inside the gas-dust lane, whilst in the south-western arm of M31 the gas-dust lane is upstream of the bright and uniform stellar arm. Earlier, evidence for the age gradient has been found in the SW arm. All these are signatures of a spiral shock, which may be associated with unusually large (for M31) pitch-angle of this SW arm segment. Such a shock may prevent the formation of the regular magnetic field, which might explain the absence of star complexes there. Anti-correlation between shock wave signatures and presence of star complexes is observed in spiral arms of a few other galaxies. Regular chains of star complexes and superclouds in spiral arms are rare, which may imply that a rather specific mechanism is involved in their formation, and the most probable one is the Parker-Jeans instability. The spiral pattern of our Galaxy is briefly discussed; it may be of M101 type in the outer parts. The regular bi-modal spacing of HI superclouds is found in Carina and Cygnus (Outer) arms, which may be an indirect evidence for the regular magnetic field along these arms.Comment: 20 pages, 12 figures, accepted for publication in MNRA

Reingeniería del proceso logístico en la empresa Rehco S.A. a nivel de pre-factibilidad

Trabajo de InvestigaciónSe realiza una reingeniería al proceso logístico de la empresa REHCO S.A a nivel de prefactibilidad, tomando como base las cuatro perspectivas (Procesos, Financiera, Clientes, Aprendizaje) del cuadro de mando integral. Dichas perspectivas se analizan desde los estudios Administrativo, Técnico y Financiero. Es así como se dan las recomendaciones para el correcto desarrollo del área en evaluación.INTRODUCCIÓN 1. DEFINICIÓN DEL CONCEPTO DE PRE FACTIBILIDAD 2. ESTUDIO ADMINISTRATIVO 3. ESTUDIO TÉCNICO 4. ESTUDIO FINANCIERO CONCLUSIONES BIBLIOGRAFÍAEspecializaciónEspecialista en Formulación y Evaluación Social y Económica de Proyecto