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Overview of recent HERMES results

机译:最近的Hermes结果概述

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An overview of more recent and important results from the HERMES experiment are presented in this paper. HERMES collected a wealth of data using the 27.6 GeV polarized HERA lepton beam and various polarized and unpolarized gaseous targets. This unique data set opens the door to the measurements of observables sensitive to the multidimensional structure of the nucleon. Among them are semi-inclusive deep-inelastic scattering measurements of azimuthal modulations sensitive to the transverse momentum distributions, such as the leading-twist Sivers and Collins distributions and distributions sensitive to the convolutions of the twist-2 and twist-3 functions. They all provide an information on the three-momentum-dependent quark distributions. Knowledge on the quark distribution as a function of longitudinal momentum and transverse position in impact-parameter space can be accessed, e.g., through exclusive ω-meson leptoproduction, particularly through the measurement of spin density matrix elements and the measurement of azimuthal modulations on transversely polarized proton target. The measurement of Bose-Einstein correlations of hadron pairs in quasi-real leptoproduction are also presented. The transverse polarization of A hyperons measured again in quasi-real leptoproduction regime are presented as well. Finally, the new analysis for the search on pentaquark at HERMES are mentioned.
机译:本文介绍了Hermes实验的更新和重要结果的概述。 Hermes使用27.6 GEV极化Hera Lepton梁和各种偏光和非偏振的气态目标收集了丰富的数据。这种独特的数据集打开了对核仁的多维结构敏感的可观察者的测量的门。其中包括对横向动量分布敏感的方位形调制的半包装深度散射测量,例如前扭曲的旋转旋转型和柯林斯分布和对扭曲-2和扭曲-3功能的卷曲敏感的分布。它们都提供了有关三次依赖性夸克分布的信息。作为纵向动量的函数和冲击参数空间中的函数的知识可以例如通过独占ω-meson溶解,特别是通过测量旋转密度矩阵元件和横向极化上的方位角调制的测量来进行进入。质子目标。还介绍了在准实际溶解中HADRON对的Bose-Einstein相关性的测量。还呈现了在准真实溶液制度中再次测量的超振荡的横向极化。最后,提到了在Hermes上搜索Pentaquark的新分析。

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