Search

New measurements of transverse single spin asymmetries at midrapidity of single hadrons and di-hadrons produced in jets are reported. They provide data on quark transversity in p+p collisions at RHIC. Pushing out to the Forward Meson Spectrometer (FMS) rapidities in future measurements will probe quark transversity at high x. Another transverse spin result from STAR is also reported: It is found that the π0 transverse single spin asymmetries at 2.5<η<4 extend to very high transverse momentum with no observed decrease. [ABSTRACT FROM AUTHOR]

A polarized hydrogen jet target will be installed at an intersection point in RHIC in the next few years to make an absolute measurement of the proton beam polarizations possible. We discuss here a procedure to measure the p-C analyzing power Ap-C in the Coulomb-nuclear interference region at beam energies between injection energy and 125 GeV. A carbon ion beam (23 – 125 GeV/A) and the polarized hydrogen jet target would be used in the measurements. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]