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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Abstract
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 |
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Status: | Published |
Refereed: | Yes |
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: | 0031-9007 |
ISSN (Online): | 1079-7114 |
Published Online: | 08 November 2002 |
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