Isospin breaking in pion-nucleon scattering at threshold by radiative processes

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dc.creatorEricson, T. E. O.
dc.creatorIvanov, A. N.
dc.date2005-03-29
dc.date.accessioned2026-07-07T03:54:32Z
dc.date.available2026-07-07T03:54:32Z
dc.descriptionWe investigate the dispersive contribution by radiative processes such as (pi- proton to neutron gamma) and (pi- proton to Delta gamma) to the pion-nucleon scattering lengths of charged pions in the heavy baryon limit. They give a large isospin violating contribution in the corresponding isoscalar scattering length, but only a small violation in the isovector one. These terms contribute 6.3(3)% to the 1s level shift of pionic hydrogen and give a chiral constant F_pi^2f_1=-25.8(8) MeV.
dc.description9 pages with 1 figure
dc.identifierhttps://arxiv.org/abs/hep-ph/0503277
dc.identifierhttp://arxiv.org/abs/hep-ph/0503277
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/44279
dc.subjectHigh Energy Physics - Phenomenology
dc.titleIsospin breaking in pion-nucleon scattering at threshold by radiative processes
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