Measurement of single- and double-spin asymmetries in deep inelastic pion electroproduction with a longitudinally polarized target.

Measurement of single- and double-spin asymmetries in deep inelastic pion electroproduction with a longitudinally polarized target.
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使用纵向极化靶测量深部非弹性π介子电生产中的单自旋和双自旋不对称性。

DOI:
10.1103/physrevlett.105.262002
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发表时间:
2010
影响因子:
8.6
通讯作者:
Avakian H
Avakian H
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Avakian H

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我们报道了在纵向极化质子的深度非弹性散射中,双自旋不对称在半包容产生介子中的横向动量依赖的首次测量。利用杰佛逊实验室(JLab)的CLAS探测器,用5.7 GeV的极化电子束获得了数据。在bjorken和虚光子平方四动量中测量了轻子散射面和强子产生面之间的方位角对单自旋不对称的调制。首次观察到一个显著的非零sin²φ单自旋不对称性,表明纵向极化质子中横向极化夸克具有强的自旋轨道相关性。
We report the first measurement of the transverse momentum dependence of double-spin asymmetries in semi-inclusive production of pions in deep-inelastic scattering off the longitudinally polarized proton. Data have been obtained using a polarized electron beam of 5.7 GeV with the CLAS detector at the Jefferson Lab (JLab). Modulations of single spin asymmetries over the azimuthal angle between lepton scattering and hadron production planeshave been measured over a wide kinematic range in Bjorkenand virtual photon squared four-momentum. A significant nonzero sin⁡2ϕ single spin asymmetry was observed for the first time indicating strong spin-orbit correlations for transversely polarized quarks in the longitudinally polarized proton.
DOI: --
发表时间: 2009
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作者:
N. P. M. Brantjes;G. Onderwater;M. D. S. E. Silva
通讯作者: M. D. S. E. Silva
H.Sakaki;H.Kurata;M.Yamanishi:电子通讯。
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