Double Pion Photoproduction off nuclei - search for the in-medium modification of the σ-meson

被引：0
|
作者：
Maghrbi, Yasser [1 ]
机构：
[1] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland
来源：
MESON 2012 - 12TH INTERNATIONAL WORKSHOP ON PRODUCTION, PROPERTIES AND INTERACTION OF MESONS | 2012年 / 37卷
关键词：
D O I：
10.1051/epjconf/20123706012
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
The photoproduction of pi(0)pi(0) and pi(0)pi(+/-) pairs has been investigated in view of the of in-medium modifications the sigma-meson. The measurements have been done at the Mainz MAMI accelerator, using the Glasgow photon tagging spectrometer and a 4 pi electromagnetic calorimeter, consisting of the Crystal Ball and TAPS detectors. The measurements covered different nuclear targets (H-2, Li-7, C-12, Ca-40, and Pb-nat) and the statistical quality of the data was improved compared to the previous experiments. The energy and mass dependence of the invariant mass distributions suggests that Final State Interactions play a very important role, but some of the observed effects can also be related to a possible in-medium modification of the sigma-meson.
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页数：4
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