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Polarization observables in the e+e- ->(Lambda)over-bar Lambda reaction
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
2016 (English)In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 52, no 5, 141Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2016. Vol. 52, no 5, 141
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-305953DOI: 10.1140/epja/i2016-16141-yISI: 000384408600001OAI: oai:DiVA.org:uu-305953DiVA: diva2:1043730
Available from: 2016-10-31 Created: 2016-10-24 Last updated: 2016-10-31Bibliographically approved

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Fäldt, Göran
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