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

Messchendorp, J. G. and Janssen, S. and Kotulla, M. and Ahrens, J. and Annand, J. R. H. and Beck, R. and Bloch, F. and Caselotti, G. and Fog, L. and Hornidge, D. and Krusche, B. and Langgartner, W. and McGeorge, J. C. and MacGregor, I. J. D. and Mengel, K. and Metag, V. and Novotny, R. and Owens, R. O. and Pfeiffer, M. and Sack, S. and Sanderson, R. and Schadmand, S.. (2002) In-medium modifications of the ππ interaction in photon-induced reactions. Physical review letters, Vol. 89, H. 22 , 222302, 4 S..

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Official URL: http://edoc.unibas.ch/dok/A5261957

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Differential cross sections of the reactions (gamma,pi(0)pi(0)) and (gamma,pi(0)pi(+/-)) have been measured for several nuclei (H-1,C-12, and Pb-nat) 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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Variant title: In-medium modifications of the pi pi interaction in photon-induced reactions -- Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:53

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