In-medium modifications of the $ππ$ interaction in photon-induced reactions

Details In-medium modifications of the $ππ$ interaction in photon-induced reactions In-medium modifications of the $ππ$ interaction in photon-induced reactions

2002-05-15

arxiv.org/abs/nucl-ex/0205009v2

Phys.Rev.Lett. 89 (2002) 222302

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevLett.89.222302

Differential cross sections of the reactions $(\gamma,\pi^\circ\pi^\circ)$ and $(\gamma,\pi^\circ\pi^++\pi^\circ\pi^-)$ have been measured for several nuclei ($^1$H,$^{12}$C, and $^{\rm nat}$Pb) at an incident-photon energy of $E_{\gamma}$=400-460 MeV at the tagged-photon facility at MAMI-B using the TAPS spectrometer. A significant nuclear-mass dependence of the $\pi\pi$ invariant-mass distribution is found in the $\pi^\circ\pi^\circ$ channel. This dependence is not observed in the $\pi^\circ\pi^{+/-}$ channel and is consistent with an in-medium modification of the $\pi\pi$ interaction in the $I$=$J$=0 channel. The data are compared to $\pi$-induced measurements and to calculations within a chiral-unitary approach.

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