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

Messchendorp, J.G. et al. (2002) In-medium modifications of the ππ interaction in photon-induced reactions. Physical Review Letters, 89(22), 222302 -4. (doi: 10.1103/PhysRevLett.89.222302)

Abstract

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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: UNSPECIFIED
• 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