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arXiv 0902.1345hep-ex
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STAR包含喷流产生的纵向自旋不对称性测量

Recent Longitudinal Spin Asymmetry Measurements for Inclusive Jet Production at STAR

David Staszak

摘要:

我们目前的测量纵向自旋不对称性,$A_{LL}$,包容性喷流信号在STAR。这里提供的数据是中等快度喷流的横向动量范围内的$5<pT<35$ GeV/c和来自极化质子-质子碰撞的质心能量为$\sqrt{s}=200$ GeV。我们比较我们的测量$A_{LL}$值的预测来自各种参数化的极化胶子分布函数。结果表明,在测量的运动学Bjorken-x范围内的$0.03<x<0.3$允许胶子参数化提供了显着的约束。

英文摘要:

We present measurements of the longitudinal spin asymmetry, $A_{LL}$, for the inclusive jet signal at STAR. The data presented here are mid-rapidity jets in the transverse momentum range of $5<pT<35$ GeV/c and come from polarized proton-proton collisions at center of mass energies of $\sqrt{s}=200$ GeV. We compare our measured $A_{LL}$ values to predictions derived from various parameterizations of the polarized gluon distribution function. The results are shown to provide significant constraints for allowable gluon parameterizations within the measurement's kinematic Bjorken-x range of $0.03<x<0.3$.

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