STAR results on longitudinal spin dynamics

Details STAR results on longitudinal spin dynamics STAR results on longitudinal spin dynamics

2006-08-08

arxiv.org/abs/hep-ex/0608022v1

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 2 figures, presented at XIV International Workshop on Deep Inelastic Scattering (DIS2006), Tsukuba, Japan, 20-24 Apri

Scientific paper

We present preliminary results on the double longitudinal spin asymmetries A_LL in inclusive jet production and the longitudinal spin transfer asymmetries D_LL in inclusive Lambda and anti-Lambda hyperon production. The data amount to about 0.5 pb-1 collected at RHIC in 2003 and 2004 with beam polarizations up to 45 %. The jet A_LL asymmetries, measured over 5 < pT < 17 GeV/c, are consistent with evaluations based on deep-inelastic scattering parametrizations for the gluon polarization in the nucleon, and disfavor large positive values of gluon polarization in the nucleon. The Lambda and anti-Lambda D_LL, measured at midrapidity and at low average transverse momentum of 1.5 GeV/c, are consistent with zero within their dominant statistical uncertainties.

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