An investigation on the impact of macroeconomic variables on stock market performance of G7 countries

This study intends to investigate the impact of exchange rate, interest rate and inflation rate on stock market performance of G7 countries which are United States, UK, Canada, Japan, Italy, Germany and France. The stock indices used in this study are Dow Jones Industrial stock index, FTSE all stock index, DAX stock index, SBF 250 index, Tokyo stock exchange index, Toronto stock exchange and Comit indices. This study employs annual data for 15 years which is from 2001 to 2015. The data is obtained from the Datastream database. An ordinary least square, fixed effect model, random effect model and fixed effect with robust standard error model are the tests used to achieve the objectives of the study. Empirical results of the fixed effect model with robust standard error show that inflation rate has a significant impact and positive relationship with the stock index movement. In particular, the regression result shows that for 1 percent increase in inflation rates the stock price would increase by 38 percent. The exchange rate and interest rate do not have any significant impact on the stock market index

Higher-order QCD corrections to Υ\Upsilon decay into double charmonia

In this work, we study the exclusive decay of $\Upsilon$ into $J/\psi$ in association with $\eta_c$ ($\chi_{c0,1,2}$). The decay widths for different helicity configurations are evaluated up to QCD next-to-leading order within the nonrelativistic QCD framework. We find that the QCD corrections notably mitigate the renormalization scale dependence of the decay widths for all the processes. The branching fraction of $\Upsilon\rightarrow J/\psi+\chi_{c1}$ is obtained as $3.73^{+5.10+0.10}_{-2.06-1.19}\times 10^{-6}$, which agrees well with the Belle measurement, i.e., ${\rm Br}(\Upsilon\rightarrow J/\psi+\chi_{c1})=(3.90\pm1.21\pm0.23)\times10^{-6}$. For the other processes, our results of the branching fractions are compatible with the upper limits given by the Belle experiments, except for $\Upsilon(2S)\to J/\psi +\chi_{c1}$, where some tension exists between theory and experiment. Having the polarized decay widths, we study the $J/\psi$ polarization, which turn out to be independent of any nonperturbative parameters. Further, according to our calculation, it is promising to measure all the processes at Super B factory thanks to the high luminosity.Comment: 13 pages, 2 figures, 3 tables, to match the version accepted for publication in PR

Incompressible Navier-Stokes-Fourier-Maxwell system with Ohm's law limit from Vlasov-Maxwell-Boltzmann system: Hilbert expansion approach

We prove a global-in-time classical solution limit from the two-species Vlasov-Maxwell-Boltzmann system to the two-fluid incompressible Navier-Stokes-Fourier-Maxwell system with Ohm's law. Besides the techniques developed for the classical solutions to the Vlasov-Maxwell-Boltzmann equations in the past years, such as the nonlinear energy method and micro-macro decomposition are employed, key roles are played by the decay properties of both the electric field and the wave equation with linear damping of the divergence free magnetic field. This is a companion paper of [Jiang-Luo: From Vlasov-Maxwell-Boltzmann system to two-fluid incompressible Navier-Stokes-Fourier-Maxwell system with Ohm's law: convergence for classical solutions. arXiv:1905.04739] in which Hilbert expansion is not employed.Comment: 73 pages. All comments welcom