Deep inelastic ratio $R=\sigma_{L}/\sigma_{T}$ and the possible   existence of scalar partons in the nucleon
  We have performed several fits to find the ratio $R=\sigma_{L}/\sigma_{T}$ in different phenomenological models. Our fits seem to leave no room for possible admixture of scalar partons inside the nucleon. 
Jan Bartelski, Wojciech Krolikowski, Miroslaw Kurzela