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

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

2001-04-03

arxiv.org/abs/nucl-ex/0104004v2

Phys.Lett.B530:67-73,2002

Physics

Nuclear Physics

Nuclear Experiment

Elsart, 12 pages and 4 figures, Correspondent: Professor Dr. Dr. h.c. mult. Achim Richter, richter@ikp.tu-darmstadt.de, submit

Scientific paper

10.1016/S0370-2693(02)01345-X

In a kinematically complete experiment at the Mainz microtron MAMI, pion angular distributions of the $^3$He(e,e'$\pi^+)^3$H reaction have been measured in the excitation region of the $\Delta$ 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 $\Delta$-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 $\pi^+$ mass of $\Delta m_{\pi^+} = (-1.7^{+ 1.7}_{- 2.1})$ MeV/c$^2$ in the neutron-rich nuclear medium at a density of $\rho = (0.057^{+ 0.085}_{- 0.057})$ fm$^{-3}$. Our data are consistent with the $\Delta$ self energy determined from measurements of $\pi^0$ photoproduction from $^4$He and heavier nuclei.

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