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

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

2009-07-30

arxiv.org/abs/0907.5369v3

Phys.Lett.B682:351-354,2010

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 1 figure, revised text

Scientific paper

10.1016/j.physletb.2009.11.041

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.

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