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

Abstract

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

4 pages, 3 figures, to be published in the Proceedings of the 17th International Spin Physics Symposium (SPIN2006), Kyoto (Japan), October 2-7, 2006