Speaker
Dr
Rajan Gupta
(Los Alamos National Lab)
Description
The remarkable result, from the measurements of spin asymmetry in
polarized deep inelastic scattering by the EMC collaboration, that the
sum of the spins of the quarks contributes less than half of the total
spin of the proton lay down the challenge to explain this “proton spin
crisis” from QCD. I will show that calculations of the required
matrix elements using Lattice QCD are now in a position to provide
first principle results with all systematics under control and the steady
reduction in the error budget. The most well determined of the contributions
is of the quark's intrinsic spin. Existing lattice results will be
reviewed and compared with current phenomenological/experimental
estimates.
Primary author
Dr
Rajan Gupta
(Los Alamos National Lab)
