Speaker
DrYaping Wang(Institute of paticle physics, Central China Normal University)
Description
One of the primary goals of the spin physics program at STAR is to constrain the polarized gluon distribution function, Δg(x), by measuring the longitudinal double-spin asymmetry (${A}{LL})ofvariousfinal−statechannels.Usingajetinthemid−rapidityregion|\eta|<0.9correlatedwithaback−to−backneutralpionintheforwardrapidityregion0.8<\eta<2.0intheSTARendcapprovidesanewtooltoaccessthe\Delta g(x)distributionatBjorken−{x}downto0.01.Comparedtoinclusivejetmeasurements,thischannelalsoallowstoconstraintheinitialpartonkinematics,suchas{x}{1},{x}{2}andinvariantmass.Inthistalk,wewillpresentthestatusoftheanalysisofthe\pi^{0}−jet{A}{LL}inlongitudinallypolarizedproton+protoncollisionsat\sqrt{s}=510GeV,extractedfrom80pb^{-1}ofdatatakenduringthe2012RHICrun.Wealsocomparetotheoreticalpredictionsofthe{A}_{LL}$ by next-to-leading order (NLO) model calculations with different polarized parton distribution functions.
