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

Messchendorp, J.G. et al. (2002) In-medium modifications of the pi pi interaction in photon-induced reactions. Physical Review Letters, 89(22), p. 222302. (doi: 10.1103/PhysRevLett.89.222302)

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Differential cross sections of the reactions (γ,π0π0) and (γ,π0π+/-) have been measured for several nuclei (1H,12C, and natPb) at an incident-photon energy of Eγ=400–460  MeV at the tagged-photon facility at MAMI-B using the TAPS spectrometer. A significant nuclear-mass dependence of the ππ invariant-mass distribution is found in the π0π0 channel. This dependence is not observed in the π0π+/- channel and is consistent with an in-medium modification of the ππ interaction in the I=J=0 channel. The data are compared to π-induced measurements and to calculations within a chiral-unitary approach.

Item Type:Articles
Glasgow Author(s) Enlighten ID:McGeorge, Dr John and Owens, Professor Robert and MacGregor, Professor Douglas and Annand, Dr John
Authors: Messchendorp, J.G., Janssen, S., Kotulla, M., Ahrens, J., Annand, J.R.H., Beck, R., Bloch, F., Caselotti, G., Fog, L., Hornidge, D., Krusche, B., Langgartner, W., McGeorge, J.C., MacGregor, I.J.D., Mengel, K., Metag, V., Novotny, R., Owens, R.O., Pfeiffer, M., Sack, S., Sanderson, R., and Schadmand, S.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114
Published Online:08 November 2002

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