| Title | Nucleon strangeness polarization from Lambda/(Lambda)over-bar hyperon production in polarized proton-proton collision at RHIC |
| Authors | Liu, Xiaonan Ma, Bo-Qiang |
| Affiliation | Peking Univ, Sch Phys, Beijing 100871, Peoples R China Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China |
| Issue Date | 2019 |
| Publisher | EUROPEAN PHYSICAL JOURNAL C |
| Abstract | We calculate the inclusive production of a polarized Lambda or (Lambda) over bar 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 chi(2), we further identify the asymmetry of the polarized strange-antistrange quarks in the proton sea and find that the first moment is Delta s approximate to 0.025 +/- 0.019 for strange quark and Delta(s) over bar approximate to 0.001 +/- 0.012 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. |
| URI | http://hdl.handle.net/20.500.11897/548268 |
| ISSN | 1434-6044 |
| DOI | 10.1140/epjc/s10052-019-6916-z |
| Indexed | SCI(E) EI |
| Appears in Collections: | 物理学院 核物理与核技术国家重点实验室 |
