Two-Photon Exchange in (Semi-)Inclusive DIS
Abstract
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(2φ) contribution to the longitudinal beam spin asymmetry shows up. Possible TPE effects for the Sivers and the Collins asymmetries in SIDIS are power-suppressed.
- Publication:
-
Spin Physics: 18th International Spin Physics Symposium
- Pub Date:
- August 2009
- DOI:
- 10.1063/1.3215707
- arXiv:
- arXiv:0902.0781
- Bibcode:
- 2009AIPC.1149..543S
- Keywords:
-
- 12.38.-t;
- 12.39.-x;
- 13.88.+e;
- Quantum chromodynamics;
- Phenomenological quark models;
- Polarization in interactions and scattering;
- High Energy Physics - Phenomenology
- E-Print:
- 4 pages, 1 figure, Presented at the 18th International Symposium on Spin Physics (SPIN 2008), Oct. 6-11, 2008, Charlottesville, VA, USA