Speaker
Dian-Jun Zhao
(CUHK(Shenzhen))
Description
We report a state-of-the-art lattice QCD calculation of the total gluon helicity contribution to the proton spin, $\Delta G$. After extrapolating to the continuum limit, $\Delta G$ is found to be $\Delta G=0.231(17)^{sta.}(44)^{sym.} at the $\overline{\mathrm{MS}}$ scale $\mu^2=10\ \mathrm{GeV}^2$, which constitutes approximately 46(9)% of the proton spin. In addition, we will also provide a theoretical workflow for extracting the total orbital angular momentum without the need for LaMET matching, and provide some numerical results.
Primary author
Dian-Jun Zhao
(CUHK(Shenzhen))
