Evidence for a Transverse Single-Spin Asymmetry in Leptoproduction of pi+pi- Pairs
Evidence for a Transverse Single-Spin Asymmetry in Leptoproduction of pi+pi- Pairs
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DOI：
10.1088/1126-6708/2008/06/017
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发表时间：
2008-03
影响因子：
5.4
通讯作者：
H. C. A. Airapetian;E. al.
中科院分区：
文献类型：
--
作者：
H. C. A. Airapetian;E. al.
在横向偏振氢靶上的半包容深度非弹性散射中产生的 pi(+)pi(-) 对的方位角分布中测量了单自旋不对称性。首次发现了横向目标偏振与包含两个π介子的平面的方位角方向之间相关性的证据。相应的单自旋不对称性预计与鲜为人知的夸克横断分布函数和未知的朴素T奇手性奇双强子碎片函数的乘积有关。
A single-spin asymmetry was measured in the azimuthal distribution of pi(+)pi(-) pairs produced in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target. For the first time, evidence is found for a correlation between the transverse target polarization and the azimuthal orientation of the plane containing the two pions. The corresponding single-spin asymmetry is expected to be related to the product of the little-known quark transversity distribution function and an unknown naive-T-odd chiral-odd dihadron fragmentation function.