Speaker
Mr
Yi-Liang Yin
(University of Science and Technology of China)
Description
The spin polarization of the Lambda hyperon in low-energy Au-Au collisions can be generated by nonlocal nucleon-nucleon scattering. We introduce a wave packet for the incoming nucleons to describe the nonlocal collision. Using the chiral perturbation theory, We calculate the spin-dependent cross section with the approximations that the width of the wave packet is small and the collision energy is close to the Lambda production threshold. The Lambda polarization emerges in peripheral collisions as a consequence of spin-orbit coupling. Our results show a spin polarization of several percent, which is consistent with the experimental data of Au-Au collisions at 3 GeV from the STAR collaboration.
Primary author
Mr
Yi-Liang Yin
(University of Science and Technology of China)
Co-authors
文博 董
(University of Science and Technology of China)
Dirk Rischke
(Goethe University Frankfurt am Main)
Qun Wang
(University of Science and Technology of China)
