Polarization observables in the e+e- → (Λ)over-barΛ reaction

被引：0
|
作者：
Faldt, Goran [1 ]
机构：
[1] Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden
来源：
EUROPEAN PHYSICAL JOURNAL A | 2016年 / 52卷 / 05期
关键词：
D O I：
10.1140/epja/i2016-16141-y
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：
Cross-section, vector-polarization, and tensor-polarization distributions are calculated for the reactions e(+)e(-) -> (p) over barp and e(+)e(-) ->(Lambda) over bar Lambda . Each reaction requires six characteristic functions that are bilinear in the, possibly complex, electromagnetic Form factors, denoted G(E)(P-2) and G(M) (P-2), of p and A. For the hyperon reaction also the joint-decay distributions of A and A are calculated. Their knowledge allows a complete determination of the hyperon electromagnetic form factors, without measuring hyperon spins. We explain how this is done in practice. For some tensor-polarization components our results are in conflict with previously repeatedly published distributions.
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页数：7
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