  The Effective Field Theory of Large-Scale Structure (EFTofLSS) is a formalism
that allows us to predict the clustering of Cosmological Large-Scale Structure
in the mildly non-linear regime in an accurate and reliable way. After
validating our technique against several sets of numerical simulations, we
perform the analysis for the cosmological parameters of the DR12 BOSS data. We
assume $\Lambda$CDM, a fixed value of the baryon/dark-matter ratio,
$\Omega_b/\Omega_c$, and of the tilt of the primordial power spectrum, $n_s$,
and no significant input from numerical simulations. By using the one-loop
power spectrum multipoles, we measure the primordial amplitude of the power
spectrum, $A_s$, the abundance of matter, $\Omega_m$, and the Hubble parameter,
$H_0$, to about $13\%$, $3.2\%$ and $3.2\%$ respectively, obtaining
$\ln(10^{10}As)=2.72\pm 0.13$, $\Omega_m=0.309\pm 0.010$, $H_0=68.5\pm 2.2$
km/(s Mpc) at 68\% confidence level. If we then add a CMB prior on the sound
horizon, the error bar on $H_0$ is reduced to $1.6\%$. These results are a
substantial qualitative and quantitative improvement with respect to former
analyses, and suggest that the EFTofLSS is a powerful instrument to extract
cosmological information from Large-Scale Structure.
