Two-Photon Exchange in (Semi-)Inclusive DIS

Details Two-Photon Exchange in (Semi-)Inclusive DIS Two-Photon Exchange in (Semi-)Inclusive DIS

2009-02-04

arxiv.org/abs/0902.0781v1

AIP Conf.Proc.1149:543-546,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure, Presented at the 18th International Symposium on Spin Physics (SPIN 2008), Oct. 6-11, 2008, Charlottesville

Scientific paper

10.1063/1.3215707

In this note we consider effects of a Two-Photon Exchange (TPE) in inclusive DIS and semi-inclusive DIS (SIDIS). In particular, transverse single spin asymmetries are generated in inclusive DIS if more than one photon is exchanged between the lepton and the hadron. We briefly summarize the TPE in DIS in the parton model and extend our approach to SIDIS, where a new leading twist $\sin(2\phi)$ contribution to the longitudinal beam spin asymmetry shows up. Possible TPE effects for the Sivers and the Collins asymmetries in SIDIS are power-suppressed.

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