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arXiv 1302.2344hep-phnucl-th
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核子内部夸克横动量分布的光锋哈密顿动力学研究

Quark Transverse Momentum Distributions inside a nucleon : a Light-Front Hamiltonian Dynamics study

Emanuele Pace, Giovanni Salme', Sergio Scopetta, Alessio Del Dotto

摘要:

通过对Bjorken极限下单自旋Sivers和Collins不对称性的冲量近似分析,说明了从极化~ 3 He的半包容深度非弹性散射中提取中子中夸克横动量分布的可能性.分析推广到有限动量转移的光前庞加莱协变框架,定义的光前自旋相关的光谱函数的J=1/2系统。核子中组分夸克的光阵面自旋相关谱函数的定义使我们能够表明,在光阵面动力学中,六个主要的扭转T偶横动量分布中只有三个是独立的。

英文摘要:

Through an impulse approximation analysis of single spin Sivers and Collins asymmetries in the Bjorken limit, the possibility to extract the quark transverse-momentum distributions in the neutron from semi-inclusive deep inelastic electron scattering off polarized 3He is illustrated. The analysis is generalized to finite momentum transfers in a light-front Poincare' covariant framework, defining the light-front spin-dependent spectral function of a J=1/2 system. The definition of the light-front spin-dependent spectral function for constituent quarks in the nucleon allows us to show that, within the light-front dynamics, only three of the six leading twist T-even transverse-momentum distributions are independent.

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