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

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dc.creatorTomasi-Gustafsson, E.
dc.creatorKuraev, E. A.
dc.creatorBakmaev, S.
dc.creatorPacetti, S.
dc.date2007-10-02
dc.date.accessioned2026-07-07T11:19:43Z
dc.date.available2026-07-07T11:19:43Z
dc.descriptionWe look for asymmetries in the angular distributions of events from recent data on $e^+ +e^-\to p +\bar p +γ$ 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 $e^+ +e^-\to μ^+ + μ^- +γ$ 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.
dc.description10 pages 2 figures
dc.identifierhttps://arxiv.org/abs/0710.0454
dc.identifierhttp://arxiv.org/abs/0710.0454
dc.identifierPhys.Lett.B659:197-200,2008
dc.identifierdoi:10.1016/j.physletb.2007.11.031
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/193777
dc.subjectHigh Energy Physics - Phenomenology
dc.titleSearch for two photon exchange from $e^+ +e^-\to p+\bar p +γ$ data
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