Few-nucleon contribution to π-scattering on light nuclei

被引：0
作者：
Liebig, S. [1 ]
Baru, V. [2 ]
Ballout, F. [1 ]
Hanhart, C. [1 ]
Nogga, A. [1 ]
机构：
[1] Forschungszentrum Julich, Inst Kernphys, Inst Adv Simulat, D-52425 Julich, Germany
[2] Inst Theoret & Expt Phys, Moscow 117218, Russia
来源：
19TH INTERNATIONAL IUPAP CONFERENCE ON FEW-BODY PROBLEMS IN PHYSICS | 2009年 / 3卷
关键词：
DEUTERON SCATTERING; ATOMS;
D O I：
10.1051/epjconf/20100304020
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We present our new results of the few-nucleon contributions to pi-H-2, pi-He-3 and pi-He-4 scattering lengths. To calculate these within the framework of Chiral Perturbation Theory we used a Monte-Carlo algorithm, which is briefly introduced. The size of the two-, three-and four-nucleon corrections in view of the expectations from two different power counting schemes is discussed. Based on our results, we estimate short range contributions, which limit the accuracy of the pi N scattering lengths extracted from few-nucleon data. Additionally, we study how the pi-He-4 system constrains the determination of the isoscalar s-wave scattering length a((+)) and its isovector counter part a((-)).
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页数：7
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