Unveiling the proton spin decomposition at a future electron-ion collider

Unveiling the proton spin decomposition at a future electron-ion collider
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揭示未来电子离子对撞机中的质子自旋分解

DOI:
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发表时间:
2015
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通讯作者:
M. Stratmann
M. Stratmann
中科院分区:
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文献类型:
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作者:
E. Aschenauer;R. Sassot;M. Stratmann

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我们提出了一个详细的评估如何以及未来的电子-离子对撞机可以限制螺旋部分子分布的核子,因此,揭示了质子的自旋预算中的夸克和胶子的内在自旋的作用。在这个分解中,任何剩余的不足都将对夸克和胶子的总轨道角动量的贡献提供最好的间接约束。具体来说,我们所有的研究都是在全球QCD分析的背景下进行的,基于现实的伪数据和最近的数据从极化质子-质子碰撞在BNL-RHIC,提供了证据,一个显着的胶子极化在可访问的,虽然有限的范围内的动量分数。我们还提出了什么可以实现的胶子的螺旋度分布的BNL-RHIC操作结束的预测。其结果是,所有的估计,目前和预计的不确定性进行了强大的拉格朗日乘数技术。
We present a detailed assessment of how well a future electron-ion collider could constrain helicity parton distributions in the nucleon and, therefore, unveil the role of the intrinsic spin of quarks and gluons in the proton’s spin budget. Any remaining deficit in this decomposition will provide the best indirect constraint on the contribution due to the total orbital angular momenta of quarks and gluons. Specifically, all our studies are performed in the context of global QCD analyses based on realistic pseudodata and in the light of the most recent data obtained from polarized proton-proton collisions at BNL-RHIC that have provided evidence for a significant gluon polarization in the accessible, albeit limited range of momentum fractions. We also present projections on what can be achieved on the gluon’s helicity distribution by the end of BNL-RHIC operations. As a result, all estimates of current and projected uncertainties are performed with the robust Lagrange multiplier technique.