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Breaking in Axial
Contributor: S. Pate.
The polarized distributions
and
of the nucleon have been measured at HERMES, and will be published soon.
With the particle identification upgrade now complete, HERMES will additionally
measure
over the next two years, while improving the precision of the
and
values. Further, HERMES will perform an integral measurement of
to
%
over the next two years. In a complimentary spin program, the Relativistic
Heavy Ion Collider (RHIC) will provide a measurement of the distribution
by approximately 2002, and later measure the polarized quark and anti-quark
distributions.
Items identified as needing theoretical study include: