Baryonic density of the universe:: Big Bang Nucleosynthesis versus CMB observations

Thanks to recent nuclear reaction rate compilations (NACRE[2]) and new experimental and theoretical works in nuclear physics, we have updated Standard Big Bang Nucleosynthesis (SBBN) calculations. The results are compared to the most representative light element abundances, measured in pristine astrophysical media to derive the baryonic density of the Universe. We confront Omega(b)h(2) obtained in this study with other values deduced from recent independent approaches as the observations of the anisotropies of the Cosmic Microwave Background (BOOMERANG, CBI, DASI, MAXIMA and VSA experiments) or the Lyman-alpha forest at high redshifts. Comparison between these results is a test of their consistency and could provide a better determination of this important cosmological parameter.