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03 December 2021
  » pubmed » pmid12485064

 Article overview

In-medium modifications of the pipi interaction in photon-induced reactions
J G Messchendorp ; S Janssen ; M Kotulla ; J Ahrens ; J R H Ann ; 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 Schadm ;
Date 25 Nov 2002
Journal Phys Rev Lett, 89 (22), 222302
AbstractDifferential cross sections of the reactions (gamma,pi(0)pi(0)) and (gamma,pi(0)pi(+/-)) have been measured for several nuclei (1H,12C, and (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(0)pi(0) channel. This dependence is not observed in the pi(0)pi(+/-) 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 PubMed, pmid12485064
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