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\(\pi\pi\) correlations in \(\gamma + A\) reactions

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Abstract.

Preliminary differential cross-sections of the reactions \(A(\gamma,\pi^{0}\pi^{0})\) and \(A(\gamma,\pi^{0}\pi^ + + \pi^{0}\pi^-)\) with A = 1 H, 12 C, and nat Pb are presented. A significant nuclear-mass dependence of the \(\pi\pi\) invariant-mass distribution is found in the \(\pi^{0}\pi^{0}\) channel. The dependence is not observed in the \(\pi^{0}\pi^{\pm}\) channel. The in-medium observation in the \(\pi^{0}\pi^{0}\) channel is consistent with an in-medium modification of the \(\pi\pi\) interaction in the I = J = 0 channel, changing width and pole position of a \(\pi\pi\) resonant state.

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Correspondence to J. G. Messchendorp.

Additional information

Received: 30 September 2002, Published online: 22 October 2003

PACS:

13.60.Le Meson production - 21.65. + f Nuclear matter

J.G. Messchendorp: For the TAPS and A2 Collaborations

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Messchendorp, J.G. \(\pi\pi\) correlations in \(\gamma + A\) reactions. Eur. Phys. J. A 18, 417–419 (2003). https://doi.org/10.1140/epja/i2002-10249-7

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  • DOI: https://doi.org/10.1140/epja/i2002-10249-7

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