https://doi.org/10.1140/epjc/s10052-019-6916-z
Regular Article - Theoretical Physics
Nucleon strangeness polarization from 
hyperon production in polarized proton–proton collision at RHIC
1
School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China
2
Collaborative Innovation Center of Quantum Matter, Beijing, China
3
Center for High Energy Physics, Peking University, Beijing, 100871, China
* e-mail: mabq@pku.edu.cn
Received:
26
February
2019
Accepted:
3
May
2019
Published online:
15
May
2019
We calculate the inclusive production of a polarized 
or 
hyperon from the single longitudinally polarized proton and proton (pp) collision at RHIC. By comparing the data reported by the STAR Collaboration, we find that this process is sensitive to the polarization of strange and antistrange quarks of the proton in the experimental range. By introducing asymmetric coefficients with the minimization of 
, we further identify the asymmetry of the polarized strange–antistrange quarks in the proton sea and find that the first moment is 
for strange quark and 
for antistrange quark, with central values agreeing with the light-cone meson–baryon fluctuation model prediction, the recent lattice QCD determination of strangeness polarization and results from a global QCD analysis given by the Jefferson Lab Angular Momentum (JAM) Collaboration.
© The Author(s), 2019
