Speaker
Description
Jet production is the primary signal for hard scattering of the partons inside protons, which is one of the dominant processes in proton-proton collisions at the RHIC energies. The jet double-spin asymmetries $A_{\text{LL}}$, measured at the STAR detector in polarized $pp$ collisions, remain one of the main sources of constraint for the polarized gluon parton distribution function $\Delta g$. An earlier STAR jet measurement at the center of mass energy $\sqrt{s} = 200$~GeV provided the first-of-its-kind, clear evidence for the non-zero gluon polarization at $x \geq 0.05$. This talk presents the latest result from the STAR jet measurement at $\sqrt{s} = 510$~GeV using a year 2012 data set. The new limit of the kinematic reach down to $x \simeq 0.015$ is achieved by our data at $\sqrt{s} = 510$~GeV from both inclusive jets and di-jets. We will also discuss the future opportunities for jet measurements after realisation of an ongoing STAR forward upgrade.
