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arXiv 1012.1970hep-ex
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在\sqrt s=200 GeV在STAR的极化pp碰撞中λ和反λ的纵向自旋转移

Longitudinal spin transfer of Lambda and anti-Lambda in polarized pp collisions at \sqrt s=200 GeV at STAR

Qing-hua Xu

备注：
6 pages, 3 figures, presentation at the SPIN2010 International Symposium, Juelich (Germany), Sep. 27-Oct. 2, 2010
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摘要：

本文报道了用RHIC STAR探测器在$\sqrt{s} = 200 GeV$上测量质子-质子碰撞中高能极化质子到$Λ$和$\barΛ$超子的纵向自旋转移D_LL。目前的测量包括$Λ$，$\barΛ$赝快度$|η| < 1.2$和横动量$p_T$到$4GeV/c$使用的数据在2005年。发现纵向自旋转移为D_LL= -0.03 \pm 0.13（stat）\pm 0.04（syst）$ for inclusive $ &lt;$$ and $ D_{LL} = -0.12 \pm 0.08（stat）\pm 0.03（syst）$ for inclusive $ \bar &lt;$$ hyperons with $ <eta>= 0.5 $ and $ <p_T>= 3.7 GeV/c$.最后，结合2009年的观测数据，对未来的观测工作进行了展望.

英文摘要：

We report our measurement on longitudinal spin transfer, D_LL, from high energy polarized protons to $Λ$ and $\barΛ$ hyperons in proton-proton collisions at $\sqrt{s} = 200 GeV$ with the STAR detector at RHIC. The current measurements cover $Λ$, $\barΛ$ pseudorapidity $|η| < 1.2$ and transverse momenta $p_T$ up to $4GeV/c$ using the data taken in 2005. The longitudinal spin transfer is found to be D_LL= -0.03\pm 0.13 (stat) \pm 0.04(syst)$ for inclusive $Λ$ and $D_{LL} = -0.12 \pm 0.08(stat) \pm 0.03(syst)$ for inclusive $\barΛ$ hyperons with $<eta> = 0.5$ and $<p_T> = 3.7 GeV/c$. The prospects with 2009 data and the future measurements are also given.

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