Implications of the BOOMERANG and MAXIMA-I results for the Baryon Mass Fraction in Clusters of galaxies

Recent BOOMERANG and MAXIMA-I analyses of the angular power spectrum of the Cosmic Microwave Background put more stringent constraints on the cosmological parameters. I show that these constraints are consistent with the observed baryon budget in clusters of galaxies, allowing any further contribution to this budget from baryons not in stars and not X-ray emitting to be less than 14 per cent at the 90 per cent level of confidence.