Search for two photon exchange from $e^+ +e^-\to p+\bar p +γ$ data

Details Search for two photon exchange from $e^+ +e^-\to p+\bar p +γ$ data Search for two photon exchange from $e^+ +e^-\to p+\bar p +γ$ data

2007-10-02

arxiv.org/abs/0710.0454v1

Phys.Lett.B659:197-200,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages 2 figures

Scientific paper

10.1016/j.physletb.2007.11.031

We look for asymmetries in the angular distributions of events from recent data on $e^+ +e^-\to p +\bar p +\gamma$ from BABAR collaboration. From first principles, as the C-invariance of the electromagnetic interaction and the crossing symmetry, the presence of two-photon exchange would create a forward backward asymmetry in the data. The analysis of the available data shows no asymmetry, within an error of 2%. This result is consistent with a structureless model for the proton, based on a calculation of $e^+ +e^-\to \mu^+ + \mu^- +\gamma$ with a proper replacement of the muon mass. As no systematic deviations are seen, we can conclude that these data do not give any hint of the presence of the two photon contribution, in all the considered kinematical range.

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