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Polarization observables in e(+) e(-) annihilation to a baryon-antibaryon pair
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0003-4937-2270
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
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2019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 5, article id 056008Article in journal (Refereed) Published
Abstract [en]

Using the helicity formalism of Jacob and Wick, we derive spin density matrices of baryon antibaryon pairs produced in e(+)e(-) annihilation. We consider the production of pairs with spins 1/2 + (1/2) over bar, 1/2 + (3/2) over bar (+c.c.) and 3/2 + (3/2) over bar. We provide modular expressions to include chains of weak hadronic two-body decays of the produced hyperons. The expressions are suitable for the analysis of high statistics data from J/psi and psi(2S) ecays at e(+) e(-) colliders, by fits to the fully differential angular distributions of the measured particles. We illustrate the method by examples, such as the inclusive measurement of the e(+) e(-) -> psi(2S) -> Omega(-)(Omega) over bar (+) process where one decay chain Omega(-) -> AK(-) followed by A -> p pi(-) is considered. Finally, we show that the inclusive angular distributions can be used to test spin assignment of the produced baryons.

Place, publisher, year, edition, pages
2019. Vol. 99, no 5, article id 056008
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Subatomic Physics
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URN: urn:nbn:se:uu:diva-381076DOI: 10.1103/PhysRevD.99.056008ISI: 000461907100009OAI: oai:DiVA.org:uu-381076DiVA, id: diva2:1306373
Available from: 2019-04-23 Created: 2019-04-23 Last updated: 2019-04-23Bibliographically approved

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Perotti, ElisabettaFäldt, GöranKupsc, AndrzejLeupold, Stefan
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