Search for two photon exchange frome++e−→p+p¯+γdata

Autor:	S. Pacetti, E. Tomasi-Gustafsson, S. Bakmaev, E. A. Kuraev
Rok vydání:	2008
Předmět:	Physics Nuclear and High Energy Physics Range (particle radiation) Particle physics media_common.quotation_subject Crossing Forward backward Asymmetry Electromagnetic interaction Quantum electrodynamics Radiative transfer Order (group theory) High Energy Physics::Experiment media_common
Zdroj:	Physics Letters B. 659:197-200
ISSN:	0370-2693
DOI:	10.1016/j.physletb.2007.11.031
Popis:	We look for asymmetries in the angular distributions of events from recent data on e + + e − → p + 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%. Such error is of the order of the asymmetry expected from radiative corrections as calculated from QED. 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::73abee45e9b1eeb5616be7494d5e4587 https://doi.org/10.1016/j.physletb.2007.11.031 Zobrazit plný text záznamu Full Text from ScienceDirect