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arXiv 0907.5369hep-ex
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双光子交换对包含性深度非弹性散射贡献的研究

Search for a Two-Photon Exchange Contribution to Inclusive Deep-Inelastic Scattering

The HERMES Collaboration, A. Airapetian

摘要:

测量了有效非极化电子束和正电子束与横向极化氢靶的深度非弹性散射的横向靶单自旋不对称性,目的是在0.007 < x_B < 0.9和0.25 GeV**2 < Q**2 < 20 GeV**2的运动学范围内寻找双光子交换信号.在Q**2 > 1 GeV**2和Q**2 < 1 GeV**2的两个独立区域内,电子束和正电子束的不对称性在统计和系统不确定度范围内均为零,对x_B积分的不对称性为10**(-3)阶。

英文摘要:

The transverse-target single-spin asymmetry for inclusive deep-inelastic scattering with effectively unpolarized electron and positron beams off a transversely polarized hydrogen target was measured, with the goal of searching for a two-photon exchange signal in the kinematic range 0.007 < x_B < 0.9 and 0.25 GeV**2 < Q**2 < 20 GeV**2. In two separate regions Q**2 > 1 GeV**2 and Q**2 < 1 GeV**2, and for both electron and positron beams, the asymmetries are found to be consistent with zero within statistical and systematic uncertainties, which are of order 10**(-3) for the asymmetries integrated over x_B.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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