Search results for "WEAK"
showing 10 items of 1417 documents
Ownership, Board Compensation and Company Performance in Sub-Saharan African Countries
2013
In countries with weak institutions, board governance becomes more important. This study uses a unique dataset from listed sub-Saharan African companies to examine the relationship between ownership composition and board compensation. It further analyses the association between board compensation and company performance. The findings indicate that board ownership and chief executive officer ownership are positively associated, whereas state ownership and concentrated ownership are negatively associated with board compensation. There is no evidence of a significant association between chairperson ownership or foreign ownership and board compensation. Finally, there is a negative but not sig…
Extreme interdependence and extreme contagion between emerging markets
2007
Abstract This paper uses seemingly unrelated probit techniques to separate the transmission of a crisis due to broadly defined macroeconomic interdependence from contagion due to herding, avoiding some of the caveats of the more traditional cross-correlation approach. We find that pure contagion occurred in a limited number of country pairs generally belonging to the same region. A reduction in speculative pressure can also be identified between countries in different regional blocks. This seems to suggest that after an initial crisis episode, investors tend to discriminate on the basis of location and common macroeconomic weakness or perceived similarity.
Política monetaria en tiempos de pandemia: evaluación y propuesta del Helicóptero Monetario
2020
La pandemia del Covid-19 ha provocado una de las crisis más importantes desde la Gran Depresión. Ante esto, es necesaria una mayor coordinación entre la política monetaria y las políticas fiscales. En este artículo, se ha analizado el Helicóptero Monetario como posible respuesta a la crisis y como complemento a las medidas adoptadas. Tras presentar evidencia histórica de los efectos del Helicóptero Monetario, examinar los distintos ejemplos propuestos en la literatura, y evaluar sus fortalezas y debilidades, se ha articulado una propuesta para la eurozona a través del Banco Central Europeo (BCE) en coordinación con el grupo del Banco Europeo de Inversiones (BEI)
The Random-Time Binomial Model
1999
In this paper we study Binomial Models with random time steps. We explain, how calculating values for European and American Call and Put options is straightforward for the Random-Time Binomial Model. We present the conditions to ensure weak-convergence to the Black-Scholes setup and convergence of the values for European and American put options. Differently to the CRR-model the convergence behaviour is extremely smooth in our model. By using extrapolation we therefore achieve order of convergence two. This way it is an efficient tool for pricing purposes in the Black-Scholes setup, since the CRR model and its extrapolations typically achieve order one. Moreover our model allows in a straig…
Probing nonstandard neutrino-electron interactions with solar and reactor neutrinos
2009
Most neutrino mass extensions of the standard electroweak model entail non-standard interactions which, in the low energy limit, can be parametrized in term of effective four-fermion operators $\nu_\alpha \nu_\beta \bar f f $. Typically of sub-weak strength, $\epsilon_{\alpha \beta} G_F$, these are characterized by dimensionless coupling parameters, $\epsilon_{\alpha \beta}$, which may be relatively sizeable in a wide class of schemes. Here we focus on non-universal (NU) flavor conserving couplings ($\alpha = \beta$) with electrons ($f = e$) and analyse their impact on the phenomenology of solar neutrinos. We consistently take into account their effect both at the level of propagation where…
The lifetime of unstable particles in electromagnetic fields
2007
We show that the electromagnetic moments of unstable particles (resonances) have an absorptive contribution which quantifies the change of the particle's lifetime in an external electromagnetic field. To give an example we compute here the imaginary part of the magnetic moment for the cases of the muon and the neutron at leading order in the electroweak coupling. We also consider an analogous effect for the strongly-decaying $\Delta$(1232) resonance. The result for the muon is Im$ \mu = e G_F^2 m^3/768 \pi^3$, with $e$ the charge and $m$ the mass of the muon, $G_F$ the Fermi constant, which in an external magnetic field of $B$ Tesla give rise to the relative change in the muon lifetime of $…
A glimpse of heavy scales through the electroweak resonance theory
2018
El Modelo Est´andar (Standard Model, SM) de f´ısica de part´ıculas representa el mejor marco te´orico para describir el mundo subat´omico. Su importancia radica en que nos ha permitido adentrarnos en un nuevo nivel m´as profundo de la realidad f´ısica y del mundo que nos rodea. En el an˜o 2012, fue confirmada la u´ltima part´ıcula fundamental que completaba el modelo, el bos´on de Higgs, en el Large Hadron Collider (LHC) y en la actualidad no hay ninguna evidencia de ninguna nueva part´ıcula ex´otica ni de ninguna desviaci´on significativa de algu´n par´ametro de la teor´ıa (las masas de los neutrinos pueden ser incluidas f´acilmente). Adem´as, son ya numerosos los modelos de altas energ´ıa…
"Exclusion contour aux 1 (Exp.)" of "Search for direct stau production in events with two hadronic $\tau$-leptons in $\sqrt{s} = 13$ TeV $pp$ collisi…
2020
Expected 95% CL exclusion limits for simplified models with direct stau pair production in SR-lowMass.
"Exclusion contour aux 1 (Obs.)" of "Search for direct stau production in events with two hadronic $\tau$-leptons in $\sqrt{s} = 13$ TeV $pp$ collisi…
2020
Observed 95% CL exclusion limits for simplified models with direct stau pair production in SR-lowMass.
"Exclusion contour 1 (Obs.)" of "Search for direct stau production in events with two hadronic $\tau$-leptons in $\sqrt{s} = 13$ TeV $pp$ collisions …
2020
The observed 95\% CL exclusion contours for the combined fit of SR-lowMass and SR-highMass for simplified models with combined ${\tilde{\tau}}^{+}_{R,L} {\tilde{\tau}}^{-}_{R,L}$ production.