In-medium modifications of the pi pi interaction in photon-induced reactions
- Messchendorp, JG
- Janssen, S
- Kotulla, M
- Ahrens, J
- Annand, JRH
- Beck, R
- Bloch, F
- Caselotti, G
- Fog, L
- Hornidge, D
- Krusche, B
- Langgartner, W
- McGeorge, JC
- MacGregor, IJD
- Mengel, K
- Metag, V.
- Novotny, R
- Owens, RO
- Pfeiffer, M
- Sack, S
- Sanderson, R.
- Schadmand, S
Publication date
November 2002
DOIAbstract
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.</p
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