Production of vector mesons and measurement of the hadronic component of photon light-cone wave function at HERA

A detailed study of vector meson production ($\phi$ and $J/\psi$) in $e^\pm p$ collisions at HERA with the ZEUS and H1 detector has been performed. The cross sections are measured as a function of $Q^2$, $W$ and $t$. In this contribution, the results are summarised, compared to theoretical calculations and the dynamical picture emerging in perturbative QCD is highlighted. The measurement of the hadronic component of the photon light-cone wave function in the exclusive production of di-pions, $ep\to e \pi^+\pi^- p$ is also reported.Comment: 4 pages, 6 figures, Submitted to be published in the Proceedings of to 32nd International Conference on High-Energy Physics (ICHEP 04), Beijing, China, 16-22 Aug 200

Wild Galois representations: elliptic curves over a 22-adic field with non-abelian inertia action

In this paper we present a description of the Galois representation attached to an elliptic curve defined over a $2$-adic field $K$, in the case where the image of inertia is non-abelian. There are two possibilities for the image of inertia, namely $Q_8$ and $SL_2(\mathbb{F}_3)$, and in each case we need to distinguish whether the inertia degree of $K$ over $\mathbb{Q}_2$ is even or odd. The result presented here can be implemented in an algorithm to compute explicitly the Galois representation in these four cases.Comment: Final accepted version, to appear in IJNT. No diagrams in this version. 10 page

Weather Variability and the Tourism Industry: A Panel Data Analysis

Increasing weather variability around the world has led to many researchers examining the impacts of weather variability on vulnerable industries. For example, the tourism industry can make up a large portion of an economy’s growth, with some of the most dependent countries relying on tourism for over 40% of GDP (World Travel & Tourism Council 2014). In an attempt to better understand the relationship between weather variability and the tourism industry at the country level, this study employs a series of fixed effects panel regression models to analyze the impact of rainfall and temperature on tourism levels and growth rates among 194 countries. Variations of the model allow for the exploration of the differential impacts sustained by island and non-island countries to help determine whether island countries are more vulnerable to weather variations due to the large contribution of tourism to their economies (Uyarra et al. 2005). Results suggest that using a yearly average measure of the temperature and rainfall data does not yield useful results, while using seasonal temperature and seasonal rainfall averages appears to explain the different impacts across island and non-island countries with more consistency

The Impact of the Institutions on Regional Unemployment Disparities

The main aim of this paper is to study European regional disparities in unemployment, considering regional productive structures and some regional institutional variables. It is widely known that one most important stylized facts concerning the EU consists in regional disparities among regions. Such differences relate to both income per capita and the labour market, the latter generally measured in terms of unemployment rates. In a recent paper (Amendola, Caroleo Coppola, 2004) we have analyzed the economic structure of the EU’s regions using proxies for the productive structure and the labour market. In this paper we estimate a panel data model where the dependent variable is the regional unemployment rate and the independent variables relate to the productive structure and some regional institutional aspects. The results confirm that institutional variables, such as the centralization of wage bargaining, the decentralization of public expenditure and the level of bureaucracy, have important impactson unemployment rates.Unemployment, Regional Disparities, Institutions, Multivariate Analysis, Panel data

Health, Lifestyle and Growth

In this paper I will try to explain why lifestyle may have a positive impact on economic growth. First of all, I consider health affecting consumer’s utility and then define a Health Production Function where health is the output and consumer good the input. In this approach a parameter named Lifestyle Return to Scale (LRS) is defined. The first result is that an increase of consumer’s personal income may have a positive or a negative effect on health. In other words health may be a normal or an inferior good. It depends on Lifestyle Return to Scale- According to this result, I compute a health multiplier and then modify the Solow Growth Model in which health is labour-augmenting. The result is a model in which the Lifestyle Return to Scale positively affects the income per capita and the income per capita growth.health; lifestyles; growth

Education and union formation as simultaneous processes in Italy and Spain

In recent times, both the time spent on education and the age at first union formation have significantly increased in Italy and Spain. In this paper, we provide empirical evidence of the endogeneity of the two processes. We use Panel data (European Community Household Panel), which provide detailed standardised information for both countries about education and training processes as a well as household formation. The effect of unobservable characteristics affecting the two processes at the same time has been controlled for, using simultaneous hazard modelling. On the one hand, the exit from the educational system increases the risk of entering the first union. On the other hand, there exist individual unobserved characteristics that influence the occurrence of the two processes simultaneously. If these characteristics are not controlled for, the effect of a completed education on union formation becomes biased upward.