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Parity-Violating Spin Asymmetries at RHIC
Motivation & Plans
The RHIC spin program is now fully underway. Several runs have been
successfully completed and are producing exciting first results. Luminosity
and polarization have improved remarkably and promising advances toward the
higher RHIC center-of-mass energy of 500 GeV have been made. At this energy
in particular, it will become possible to perform measurements of
parity-violating spin asymmetries. Parity violation occurs in weak
interactions, and in combination with the unique polarization capabilities
at RHIC fascinating new opportunities arise. In particular, parity-violating
single- and double-spin asymmetries give new insights into nucleon structure
by allowing probes of up and down sea and anti-quark polarizations. Such
measurements at RHIC are a DOE performance milestone for the year 2013 and
are also supported by a very large effort from RIKEN. With transverse
polarization, charged-current interactions may be sensitive to the Sivers
effect. Parity-violating effects at RHIC have been proposed even as probes
of physics beyond the Standard Model.
Last Modified: February 12, 2007