Can Baryon Chiral Perturbation Theory be used to extrapolate lattice   data for the moment $\langle x\rangle_{u-d}$ of the nucleon?
  We discuss the question in the title employing manifestly covariant Baryon Chiral Perturbation Theory and recent high-statistics lattice results published in [1]. 
Peter C. Bruns, Ludwig Greil, Rudolf R\"odl, and Andreas Sch\"afer
hep-lat hep-ph