核子中angular momentum和奇异性的最新结果
Recent results on angular momentum and strangeness in the nucleon
摘要：
HERMES已经测量了π介子和带电K介子的方位角单自旋不对称性，这些介子和K介子是在电子和正电子离开横向极化的氢靶的深度非弹性散射中产生的。这些不对称性提供了关于柯林斯和西弗斯机制的信息，它们分别是横向部分子分布函数h_1 ^q与柯林斯碎裂函数H_1^{ \perp，q}卷积的信号，以及西弗斯分布函数f_{1T} ^{ \perp，q}与自旋平均碎裂函数D_q^h卷积的信号。此外，无论是动量和螺旋度分布的奇夸克海已提取领先的顺序，从多重性和包容性的双自旋不对称性，分别在生产带电的K介子时，散射极化正电子离开纵向极化氘目标。动量分布的形状比\bar{u}和\bar{d}夸克的平均值更软。螺旋度分布被发现是一致的零。
英文摘要：
HERMES has measured azimuthal single-spin asymmetries of pions and charged kaons produced in deep-inelastic scattering of electrons and positrons off a transversely polarized hydrogen target. These asymmetries provide information about the Collins and Sivers mechanisms, which are signals for the transverse parton distribution function h_1^q in convolution with the Collins fragmentation function H_1^{\perp,q}, and of the Sivers distribution function f_{1T}^{\perp,q} with the spin-averaged fragmentation function D_q^h, respectively. Furthermore, both the momentum and helicity distributions of the strange quark sea have been extracted in leading order from the multiplicity and the inclusive double spin asymmetry, respectively, in the production of charged kaons when scattering polarized positrons off a longitudinally polarized deuterium target. The shape of the momentum distribution is softer than that of the average of the \bar{u} and \bar{d} quarks. The helicity distribution is found to be consistent with zero.
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