%0 Journal Article %T Endpoint estimates for first-order Riesz transforms associated to the Ornstein-Uhlenbeck operator %A G. Mauceri %A S. Meda %A P. Sj£żgren %J Mathematics %D 2010 %I arXiv %X In the setting of Euclidean space with the Gaussian measure g, we consider all first-order Riesz transforms associated to the infinitesimal generator of the Ornstein-Uhlenbeck semigroup. These operators are known to be bounded on L^p(g), for 1