Recent results of gluon and sea quark polarization measurements in polarized proton-proton collisions at STAR

30th Winter Workshop on Nuclear Dynamics

Li, Xuan^1

Physics Department, Temple University, 1900 North 13th street, Philadelphia

19122, United States^1

关键词: Extended range;    Internal structure;    Momentum fraction;    Polarized proton-proton collisions;    Polarized protons;    Single-spin asymmetries;    Spin asymmetry;    STAR experiment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/535/1/012003/pdf
DOI  :  10.1088/1742-6596/535/1/012003

来源: IOP

【 摘 要 】

The STAR experiment at RHIC is carrying out a comprehensive high-energy spin physics program to understand the internal structure and dynamics of the proton in polarized proton-proton collisions at √s = 200 GeV and √s = 500/510 GeV. STAR has the capability, with nearly full azimuthal coverage, to reconstruct leptons, hadrons and jets in the mid-rapidity region (|η| 2)/g(x,Q2)) to the proton spin for 0.05 +/?bosons at √s = 500/510 GeV in polarized proton-proton collisions provide a direct probe of the polarized anti-u and anti-d quark distributions (Δu¯(x,Q2), Δd¯(x,Q2)). These results better constrain the polarized gluon and sea quark distributions of the proton in the RHIC sensitive kinematic region. Future measurements with continuing high energy polarized proton-proton run at RHIC and detector upgrade will explore the gluonic contribution to the proton spin in extended range.