Self energies of the pion and the delta isobar from the ^3He(e,e'pi^+)^3H reaction

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dc.creatorKohl, M.
dc.creatorKuss, M.
dc.creatorRangacharyulu, C.
dc.creatorRichter, A.
dc.creatorSchrieder, G.
dc.creatorSuda, T.
dc.creatorUrban, M.
dc.creatorWirzba, A.
dc.creatorWambach, J.
dc.creatorMAMI, the A1 Collaboration at
dc.date2001-04-03
dc.date2002-01-30
dc.date.accessioned2026-07-07T10:54:25Z
dc.date.available2026-07-07T10:54:25Z
dc.descriptionIn a kinematically complete experiment at the Mainz microtron MAMI, pion angular distributions of the $^3$He(e,e'$π^+)^3$H reaction have been measured in the excitation region of the $Δ$ resonance to determine the longitudinal ($L$), transverse ($T$), and the $LT$ interference part of the differential cross section. The data are described only after introducing self-energy modifications of the pion and $Δ$-isobar propagators. Using Chiral Perturbation Theory (ChPT) to extrapolate the pion self energy as inferred from the measurement on the mass shell, we deduce a reduction of the $π^+$ mass of $Δm_{π^+} = (-1.7^{+ 1.7}_{- 2.1})$ MeV/c$^2$ in the neutron-rich nuclear medium at a density of $ρ= (0.057^{+ 0.085}_{- 0.057})$ fm$^{-3}$. Our data are consistent with the $Δ$ self energy determined from measurements of $π^0$ photoproduction from $^4$He and heavier nuclei.
dc.descriptionElsart, 12 pages and 4 figures, Correspondent: Professor Dr. Dr. h.c. mult. Achim Richter, richter@ikp.tu-darmstadt.de, submitted to Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/nucl-ex/0104004
dc.identifierhttp://arxiv.org/abs/nucl-ex/0104004
dc.identifierPhys.Lett.B530:67-73,2002
dc.identifierdoi:10.1016/S0370-2693(02)01345-X
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/185795
dc.subjectNuclear Experiment
dc.titleSelf energies of the pion and the delta isobar from the ^3He(e,e'pi^+)^3H reaction
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