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The proton spin structure is not understood yet and there has remained largeuncertainty on Delta g, the gluon spin contribution to the proton. Doublehelicity asymmetry (A_LL) of pi0 production in polarized pp collisions is usedto constrain Delta g. In this report, preliminary results of A_LL of pi0 in ppcollisions at sqrt(s) = 62.4 GeV measured by PHENIX experiment in 2006 ispresented. It can probe higer x region than the previously reported pi0 A_LL atsqrt(s) = 200 GeV thanks to the lower center of mass energy.

Double Helicity Asymmetry of Inclusive pi0 Production in Polarized pp Collisions at sqrt(s)=62.4GeV