Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-12-22
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 2 eps figures. Talk presented at the Particles and Nuclei International Conference (PANIC05), October 24-28, 2005 San
Scientific paper
10.1063/1.2220191
Preliminary results for the longitudinal polarization of $\Lambda$ and ${\bar \Lambda}$ hyperons in longitudinally polarized proton-proton collisions at $\sqrt s$ = 200 GeV are presented. The $\Lambda$($\bar \Lambda$) candidates are reconstructed at mid-rapidity ($|\eta|<1$) with the time projection chamber of the STAR experiment at RHIC, using 0.5 pb$^{-1}$ collected in 2003 and 2004 with beam polarizations of up to 45%. Their mean longitudinal momentum fraction $x_F$ is about 8 $\times$$10^{-3}$ and their mean transverse momentum $p_T$ is about 1.5 GeV. The analysis uses asymmetries of counts for different spin states of the colliding proton beams and does not require detailed knowledge of the detector acceptance. The preliminary $\Lambda$(${\bar \Lambda}$) polarization values are consistent with zero within their statistical uncertainties of 0.05.
STAR collaboration for the
Xu Qing-hua
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