Parton distributions from the lattice
Abstract
Description
I review the current status of lattice calculations for two selected observables related to nucleon structure: the second moment of the unpolarized parton distribution, <x> (u-d), and the first moment of the polarized parton distribution, the non-singlet axial coupling gA. The major challenge is the requirement to extract them sufficiently close to the chiral limit. In the former case, there still remains a puzzling disagreement between lattice data and experiment. For the latter quantity, however, we may be close to obtaining its value from the lattice in the immediate future.
Invited review at BARYONS 2004, Palaiseau, France, October 25 - 29, 2004
Invited review at BARYONS 2004, Palaiseau, France, October 25 - 29, 2004