Abstract
The longitudinal spin transfer to and hyperons produced in high-energy polarized proton-proton collisions is expected to be sensitive to the helicity distribution functions of strange quarks and antiquarks of the proton, and to longitudinally polarized fragmentation functions. We report an improved measurement of from data obtained at a center-of-mass energy of with the STAR detector at RHIC. The data have an approximately twelve times larger figure of merit than prior results and cover in pseudorapidity with transverse momenta up to . In the forward scattering hemisphere at largest , the longitudinal spin transfer is found to be for hyperons and for antihyperons. The dependences on and are presented and compared with model evaluations.
- Received 23 August 2018
DOI:https://doi.org/10.1103/PhysRevD.98.112009
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Published by the American Physical Society