Abstract
Understanding the contribution of the polarized gluons to the proton spin is one of the key steps toward resolving the nucleon spin crisis. At RHIC energy, heavy quark production is dominated by gluon‐gluon interaction, thus measurements of the heavy flavor production in the polarized p+p collisions will allow us to directly access the polarized gluon distribution. During the recent polarized p+p run in 2006, the PHENIX experiment collected 7.5pb−1 data with average longitudinal beam polarization ∼ 60%, and successfully reconstructed about 20K J/ψ candidates from the level‐2 trigger filtered data. We present the latest results of ALL in J/ψ production in the longitudinally polarized p+p collisions at s = 200GeV.
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