π-π correlations in photon-induced reactions

被引：0
|
作者：
Messchendorp, J [1 ]
机构：
[1] Univ Giessen, Inst Phys 2, D-6300 Giessen, Germany
来源：
PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT | 2003年 / 149期
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D O I：
暂无
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Differential cross sections of the-reactions A(gamma,pi(0) pi(0)) and A(gamma, pi(0) pi(+) + pi(0) pi(-)) with A=H-1, C-12, and Pb-nat are presented. A significant. nuclear-mass dependence of the pipi invariant-mass distribution is found in the pi(0) pi(0) channel. The dependence is not observed in the pi(0) pi(+/-) channel. Within a unitary chiral-perturbation approach,(5)) the in-medium observation in the pi(0) pi(0) channel is interpreted as an in-medium modification of the pipi interaction in the sigma (I=J=0) channel, changing width and pole position with increasing effective nuclear density.
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页码：102 / 111
页数：10
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