New light on electromagnetic corrections to the scattering parameters obtained from experiments on pionium

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dc.creatorGashi, A.
dc.creatorOades, G. C.
dc.creatorRasche, G.
dc.creatorWoolcock, W. S.
dc.date2001-08-14
dc.date2001-11-12
dc.date.accessioned2026-07-07T12:02:49Z
dc.date.available2026-07-07T12:02:49Z
dc.descriptionWe calculate the electromagnetic corrections needed to obtain isospin invariant hadronic pion-pion s-wave scattering lengths a^0, a^2 from the elements a_cc, a_0c of the s-wave scattering matrix for the (π^+ π^-, π^0 π^0) system at the π^+ π^- threshold. These elements can be extracted from experiments on pionium. Our calculation uses energy independent hadronic pion-pion potentials that satisfactorily reproduce the low-energy phase shifts given by two-loop chiral pertur- bation theory. We also take into account an important relativistic effect whose inclusion influences the corrections considerably.
dc.description14 pages including 3 figures. Uses elsart.cls. Some numbers have been updated and a few typos have been corrected
dc.identifierhttps://arxiv.org/abs/hep-ph/0108116
dc.identifierhttp://arxiv.org/abs/hep-ph/0108116
dc.identifierNucl.Phys.A699:732-742,2002
dc.identifierdoi:10.1016/S0375-9474(01)01292-1
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/207569
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Theory
dc.titleNew light on electromagnetic corrections to the scattering parameters obtained from experiments on pionium
dc.typetext

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