Polarized sea measurements at JPARC
  Large double spin-asymmetries can be foreseen for Drell-Yan production in $p p$ scattering at JPARC energies. The sign of the asymmetries can be used to discriminate between different model calculations of sea quark distributions. 
Marco Contalbrigo, Alessandro Drago and Paolo Lenisa (Ferrara U. &   INFN, Ferrara, Italy)