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25 April 2024

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In-medium modifications of the $pipi$ interaction in photon-induced reactions
J.G. Messchendorp ; S. Janssen ; M. Kotulla ; J. Ahrens ; J.R.H. Annand ; R. Beck ; F. Bloch ; G. Caselotti ; L. Fog ; D. Hornidge ; B. Krusche ; W. Langgärtner ; J.C. McGeorge ; I.J.D. MacGregor ; K. Mengel ; V. Metag ; R. Novotny ; R.O. Owens ; M. Pfeiffer ; S. Sack ; R. Sanderson ; S. Schadmand ;
Date:	15 May 2002
Journal:	Phys.Rev.Lett. 89 (2002) 222302
Subject:	nucl-ex
Abstract:	Differential cross sections of the reactions $(gamma,pi^circpi^circ)$ and $(gamma,pi^circpi^++pi^circpi^-)$ have been measured for several nuclei ($^1$H,$^{12}$C, and $^{ m nat}$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 $pipi$ invariant-mass distribution is found in the $pi^circpi^circ$ channel. This dependence is not observed in the $pi^circpi^{+/-}$ channel and is consistent with an in-medium modification of the $pipi$ interaction in the $I$=$J$=0 channel. The data are compared to $pi$-induced measurements and to calculations within a chiral-unitary approach.
Source:	arXiv, nucl-ex/0205009
Other source:	[GID 388131] nucl-ex/0205009
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