Analysis and interpretation of new low-energy Pi-Pi scattering data

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dc.creatorDescotes, S.
dc.creatorFuchs, N. H.
dc.creatorGirlanda, L.
dc.creatorStern, J.
dc.date2001-12-05
dc.date2002-04-15
dc.date.accessioned2026-07-07T11:31:11Z
dc.date.available2026-07-07T11:31:11Z
dc.descriptionThe recently published E865 data on charged K_e4 decays and Pi-Pi phases are reanalyzed to extract values of the two S-wave scattering lengths, of the subthreshold parameters alpha and beta, of the low-energy constants l3-bar and l4-bar as well as of the main two-flavour order parameters: <u-bar u> and F_pi in the limit m_u = m_d = 0 taken at the physical value of the strange quark mass. Our analysis is exclusively based on direct experimental information on Pi-Pi phases below 800 MeV and on the new solutions of the Roy equations by Ananthanarayan et al. The result is compared with the theoretical prediction relating 2 a_0^0 - 5 a_0^2 and the scalar radius of the pion, which was obtained in two-loop Chiral Perturbation Theory. A discrepancy at the 1-sigma level is found and commented upon.
dc.descriptionPublished version, to appear in Eur. Phys. J. C
dc.identifierhttps://arxiv.org/abs/hep-ph/0112088
dc.identifierhttp://arxiv.org/abs/hep-ph/0112088
dc.identifierEur.Phys.J.C24:469-483,2002
dc.identifierdoi:10.1007/s10052-002-0965-3
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/197182
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleAnalysis and interpretation of new low-energy Pi-Pi scattering data
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