Parton distributions from the lattice

Details Parton distributions from the lattice Parton distributions from the lattice

2005-01-17

arxiv.org/abs/hep-ph/0501156v1

Nucl.Phys.A755:333-336,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

Invited review at BARYONS 2004, Palaiseau, France, October 25 - 29, 2004

Scientific paper

10.1016/j.nuclphysa.2005.03.034

I review the current status of lattice calculations for two selected observables related to nucleon structure: the second moment of the unpolarized parton distribution, (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.

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