A preliminary analysis of eta' -> eta pi pi in chiral theories

Preliminary results for the Dalitz plot distribution of $\eta^\prime\to\eta\pi\pi$ decays in the frameworks of Large-$N_c$ Chiral Perturbation Theory and Resonance Chiral Theory are given. We hope our results to be of some relevance for the present and forthcoming analysis of these decays at GAMS, CLEO, VES, KLOE-2, Crystal Ball, Crystal Barrel, WASA, and BES-III.Comment: 5 pages, uses aipproc style. Talk presented at the XIII International Conference on Hadron Spectroscopy (HADRON09), Florida State University (Tallahassee), USA, 29.11-4.12.200

Carbon footprint in dehesa agroforestry systems

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Fluid flow queue models for fixed-mobile network evaluation

A methodology for fast and accurate end-to-end KPI, like throughput and delay, estimation is proposed based on the service-centric traffic flow analysis and the fluid flow queuing model named CURSA-SQ. Mobile network features, like shared medium and mobility, are considered defining the models to be taken into account such as the propagation models and the fluid flow scheduling model. The developed methodology provides accurate computation of these KPIs, while performing orders of magnitude faster than discrete event simulators like ns-3. Finally, this methodology combined to its capacity for performance estimation in MPLS networks enables its application for near real-time converged fixed-mobile networks operation as it is proven in three use case scenarios

Testing Nonlinearity: Decision Rules for Selecting between Logistic and Exponential STAR Models

A new LM specification procedure to choose between Logistic and Exponential Smooth Transition Autoregressive (STAR) models is introduced. The new decision rule has better properties than those previously available in the literature when the model is ESTAR and similar properties when the model is LSTAR. A simple natural extension of the usual LM-test for linearity is introduced and evaluated in terms of power. Monte-Carlo simulations and empirical evidence are provided in support of our claims.Publicad

Cointegration and common factors

Alternative common factors representations for cointegrated vectors are studied. It is shown that dynamic factor models produce as particular cases the alternative common trend representations for cointegrated variables available in the literature, including the one of Stock and Watson(1988). Furthermore, it is proved that common factor representations with I(1) components imply cointegration. A more efficient procedure for fmding the numbers of cointegrated vectors based on this dynamic factors model is suggested

Catching up in total factor productivity through the business cycle : evidence from Spanish manufacturing surveys

Spain has recently experienced more than a decade of price stability and economic growth however now is showing one of the most significant slowdowns in economic activity of the EU economies. There is a general consensus that this slowdown in economic activity is particularly important in Spain due to the low level and low rates of growth experienced by total factor productivity (TFP) during more than a decade. Among the key policy elements that could enhance TFP of manufacturing firms in Spain we find those related to human capital, foreign direct investment, and process innovations. We evaluate the effect of recessions on the productivity growth of firms with different level of productivity. We present evidence on the dynamic of firm’s TFP through the business cycle allowing for a differentiated behavior for technological leaders and followers. We observe lower persistence and faster convergence in TFP during recessions and, higher persistence and non convergence in TFP during expansions. These empirical findings are consistent with the predictions obtained from the technological diffusion literature and from the fact that firm’s innovation is pro-cyclical. These conclusions are obtained from a microeconometric analysis of surveys of Spanish manufacturing firms (ESEE) from 1991 to year 2005