Determination of the b-quark leading shape function parameters in the   shape function scheme using the Belle B->X_s gamma photon energy spectrum
  We determine the b-quark shape function parameters in the shape function scheme, m_b(SF) and \mu_\pi^2(SF), using the Belle B->X_s gamma photon energy spectrum. We assume three models for the form of the shape function; exponential, gaussian and hyperbolic. 
I. Bizjak, A. Limosani, T. Nozaki