Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-12-14
AIPConf.Proc.915:428-431,2007
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 3 eps figures. Prepared for the 17th International Spin Physics Symposium (SPIN2006), Kyoto, Japan, October 2 to 7, 2
Scientific paper
10.1063/1.2750816
This contribution reports on a proof-of-principle measurement of the longitudinal spin transfer $D_{LL}$ in inclusive $\Lambda$ and $\bar \Lambda$ production in polarized proton-proton collisions at a center of mass energy $\sqrt{s}$ = 200 GeV. The data sample consists of about 3 $\times$ $10^6$ minimum bias events collected in the year 2005 by the STAR experiment at RHIC with proton beam polarizations of up to 50%. The $\Lambda$($\bar \Lambda$) candidates are reconstructed at mid-rapidity ($|\eta|<1$) using the STAR Time Projection Chamber via the dominant decay channel $\Lambda\to p \pi^-$ ($\bar \Lambda \to \bar p \pi^+$). Their mean transverse momentum $p_T$ is about 1.3 GeV/c and longitudinal momentum fraction $x_F = 7.5 \times 10^{-3}$ . The longitudinal $\Lambda$($\bar \Lambda$) polarization is determined using a method in which the detector acceptance mostly cancels.
STAR collaboration for the
Xu Qing-hua
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