Speaker
Description
Jets provide one of the primary tools to study the partons inside
protons. The cross section of inclusive jet production is one of the
main observables to study the hard scattering. It is well described by
pQCD in the collinear factorization framework. For proton-proton
collisions at RHIC at a center-of-mass energy $\sqrt{s} =
200~\text{GeV}$, the STAR detector provides measurements at $x_T
\equiv \frac{2p_T}{\sqrt{s}}$ as high as $\sim 0.4$. At this energy
and in this kinematic region, the direct scattering on gluons inside
the colliding protons contributes about a half of the total cross
section. Thus, measuring the inclusive jet cross section at RHIC,
together with the past Deep Inelastic Scattering measurements, can
provide further constraints on the gluon Parton Distribution Function
at high $x$. The status report for a new measurement of inclusive jet
cross section at mid-rapidity at STAR using the $\sqrt{s} =
200~\text{GeV}$ $pp$ data from 2012 will be presented. Compared to the
previous measurement from 2006, improvements include: employing the
anti-$k_T$ jet reconstruction, a full barrel and endcap
electromagnetic calorimeter acceptance, unfolding of the detector
response, and correcting jet parameters for Underlying Event
contributions.
