Abstract
One of the primary goals of the spin physics program at STAR is to constrain the polarized gluon distribution function, [Formula: see text], by measuring the longitudinal double-spin asymmetry ([Formula: see text]) of various final-state channels. Using a jet in the mid-rapidity region [Formula: see text] correlated with an azimuthally back-to-back [Formula: see text] in the forward rapidity region [Formula: see text] provides a new possibility to access the [Formula: see text] distribution at Bjorken-[Formula: see text] down to 0.01. Compared to inclusive jet or inclusive [Formula: see text] measurements, this channel also allows to constrain the initial parton kinematics. In these proceedings, we will present the status of the analysis of the [Formula: see text]-jet [Formula: see text] in longitudinally polarized proton+proton collisions at [Formula: see text] =510 GeV with 80 pb[Formula: see text] of data taken during the 2012 RHIC run. We also compare the projected [Formula: see text] uncertainties to theoretical predictions of the [Formula: see text] by next-to-leading order (NLO) model calculations with different polarized parton distribution functions.
Highlights
Proton has a finite charge radius and consists of quarks and gluons
The partonic double spin asymmetries aLL are known from theory, and the ALL measurements can directly constrain ∆G
The endcap electromagnetic calorimeter (EEMC) is used to measure the energy and position of photons from π0 decays across the range of 1.086< ηdet
Summary
Proton has a finite charge radius and consists of quarks and gluons According to the Manohar-Jaffe sum rule[1], the proton spin can be decomposed into all possible contributions from its constituents, as expressed by Eq (1), Sp. which makes explicit the contributions from the quark and gluon polarizations (∆Σ and ∆G, respectively) and orbital angular momenta (Lq and Lg, respectively). Which makes explicit the contributions from the quark and gluon polarizations (∆Σ and ∆G, respectively) and orbital angular momenta (Lq and Lg, respectively) This is an Open Access article published by World Scientific Publishing Company. One goal of the spin physics program at RHIC is to constrain the polarized gluon distribution function, ∆g(x), by measuring the longitudinal double-spin asymmetry (ALL) of various final states. The partonic double spin asymmetries aLL are known from theory, and the ALL measurements can directly constrain ∆G
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