Search results for "moment"
showing 10 items of 3027 documents
Unveiling the strong interaction among hadrons at the LHC
2020
One of the key challenges for nuclear physics today is to understand from first principles the effective interaction between hadrons with different quark content. First successes have been achieved using techniques that solve the dynamics of quarks and gluons on discrete space-time lattices1,2. Experimentally, the dynamics of the strong interaction have been studied by scattering hadrons off each other. Such scattering experiments are difficult or impossible for unstable hadrons3–6 and so high-quality measurements exist only for hadrons containing up and down quarks7. Here we demonstrate that measuring correlations in the momentum space between hadron pairs8–12 produced in ultrarelativistic…
Is Momentum in Currency Markets Driven by Global Economic Risk?
2015
This article investigates the potential link between momentum in currency returns and global economic risk as measured by currency return dispersion (RD). We find that the spread on zero-cost currency momentum strategies is larger and highly significant in high RD states compared to low RD states. Also, the relation between these momentum payoffs and global economic risk appears to increase linearly in risk. Further tests indicate that the same macroeconomic risk component in currency markets is present in global equity markets. Based on this evidence, we conclude that global economic risk as proxied by RD helps to explain currency momentum profits.
Complementarities in innovation strategy: do intangibles play a role in enhancing firm performance?
2017
This article assesses the role of investments in intangible capital and their potential complementarities as a way to improve firm productivity. We focus on the three intangible resources that, according to the literature, have the greatest strategic importance: research and development (R & D), advertising, and human capital. To test our hypotheses, we use a large sample of Spanish manufacturing firms and consider estimates of total factor productivity through a generalized method of moments approach. Our results show evidence of complementarities between R & D and advertising investments and between advertising and human capital. However, they are not conclusive in the case of R & D and h…
¿Puede un factor réplica del crecimiento económico futuro (PIB) explicar los rendimientos de los activos financieros cotizados en la bolsa española?
2020
El objetivo de este trabajo es analizar si un factor con capacidad predictiva sobre el crecimiento económico futuro, captura los rendimientos de los activos cotizados en la bolsa española. A su vez, se analiza la posible interpretación racional económica de los factores de Fama y French y momentum, como variables con información sobre dicho crecimiento económico futuro. Se cuantifican estos efectos para las etapas de crisis (económica: 1993-1997 y financiera: 2008-2011) y de expansión económica (1998-2007). Los resultados subrayan la relevancia y capacidad explicativa de este factor predictivo pero se encuentra una interpretación económica débil de los factores tamaño y ratio book-to-market…
Sampling properties of the Bayesian posterior mean with an application to WALS estimation
2022
Many statistical and econometric learning methods rely on Bayesian ideas, often applied or reinterpreted in a frequentist setting. Two leading examples are shrinkage estimators and model averaging estimators, such as weighted-average least squares (WALS). In many instances, the accuracy of these learning methods in repeated samples is assessed using the variance of the posterior distribution of the parameters of interest given the data. This may be permissible when the sample size is large because, under the conditions of the Bernstein--von Mises theorem, the posterior variance agrees asymptotically with the frequentist variance. In finite samples, however, things are less clear. In this pa…
Putting time into space: the temporal coherence of spatial applications in the housing market
2016
International audience; Relationships between past events, future expectations and present decisions, typically examined through a temporal prism within applied economics, have been lately moving to the spatial dimension through spatial econometrics. However, violations of the “arrow of time”, and thus causality, have been identified in spatial econometric techniques applied to spatio-temporal data consisting of observations each at a specific location and distinct moment in time. A comprehensive review classifies for the first time several redresses to this issue in a currently fragmented literature. This paper puts back the temporal dimension into spatial Hedonic Pricing models through a …
Reliable measures of plastic deformations for elastic plastic structures in shakedown conditions
2020
A new formulation for evaluating reliable measures of the plastic deformations occurring in the transient phase of a structure in shakedown conditions is proposed. The structure is thought as constituted by elastic perfectly plastic material and subjected to a combination of fixed and cyclic loads. The proposed formulation consists in the search for the optimal plastic strain field that minimize a suitable objective function defining a strain energy measure related to the plastic strains at the shakedown limit. The typical self-stress field can be obtained as the elastic structural response to an assigned plastic strain field respecting appropriate ductility limits for the material. Without…
Observation of Meson-Exchange Effects in Deuteron Electrodisintegration
1976
Electrodisintegration of the deuteron has been measured for an incident energy of 300 MeV at 30\ifmmode^\circ\else\textdegree\fi{} and 90\ifmmode^\circ\else\textdegree\fi{} scattering angles. The maximum energy transfer was 116 MeV. Very good agreement with theory was achieved when the pionic-exchange currents were included. Near the threshold and for momentum transfer $\stackrel{\ensuremath{\rightarrow}}{\mathrm{q}}_{\mathrm{c}.\mathrm{m}.}^{}{}_{}{}^{2}=3.9$ ${\mathrm{fm}}^{\ensuremath{-}2}$, the meson-exchange currents contribute about 40% to the total cross section.
Estimating the two-particle $K$-matrix for multiple partial waves and decay channels from finite-volume energies
2017
An implementation of estimating the two-to-two $K$-matrix from finite-volume energies based on the L\"uscher formalism and involving a Hermitian matrix known as the "box matrix" is described. The method includes higher partial waves and multiple decay channels. Two fitting procedures for estimating the $K$-matrix parameters, which properly incorporate all statistical covariances, are discussed. Formulas and software for handling total spins up to $S=2$ and orbital angular momenta up to $L=6$ are obtained for total momenta in several directions. First tests involving $\rho$-meson decay to two pions include the $L=3$ and $L=5$ partial waves, and the contributions from these higher waves are f…
Elastic pion scattering on the deuteron in a multiple scattering model
1996
Pion elastic scattering on deuterium is studied in the KMT multiple scattering approach developed in momentum space. Using a Paris wave function and the same methods and approximations as commonly used in pion scattering on heavier nuclei excellent agreement with differential cross section data is obtained for a wide range of pion energies. Only for $T_{\pi}>250$ MeV and very backward angles, discrepancies appear that are reminiscent of disagreements in pion scattering on $^3$He, $^3$H, and $^4$He. At low energies the second order corrections have been included. Polarization observables are studied in detail. While tensor analyzing powers are well reproduced, vector analyzing powers exhibit…