Photon-jet coincidence measurements in polarized pp collisions at sqrt{s}=200 GeV with the STAR Endcap Calorimeter

TL;DR

This paper discusses photon-jet coincidence measurements in polarized proton-proton collisions at 200 GeV, aiming to explore the x-dependence of the polarized gluon distribution using the STAR Endcap Calorimeter.

Contribution

It presents the status of photon-jet coincidence studies at forward pseudorapidity, expanding the understanding of gluon polarization in protons.

Findings

Photon-jet coincidence measurements are underway at forward pseudorapidity.

These measurements will help constrain the x-dependence of Delta g(x).

Initial results demonstrate the feasibility of using the STAR Endcap Calorimeter for such studies.

Abstract

Recent inclusive measurements with polarized proton-proton collisions at RHIC provide significant constraints on the polarized gluon distribution, Delta g(x), integrated over the gluon momentum range 0.02 < x < 0.3. Di-jet and photon-jet coincidence measurements will allow to study the x-dependence of Delta g(x). In this report we present the status of photon-jet coincidence studies for photons detected at forward pseudorapidity, 1.08<eta<2, using the STAR Endcap Calorimeter.