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A study of spin alignment of ρ(770)± and ω(782) mesons in hadronic Z0 decays

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  • OPAL Collaboration
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<mark>Journal publication date</mark>08/2000
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number1
Volume16
Number of pages10
Pages (from-to)61-70
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The helicity density matrix elements ρ00 of ρ(770)± and ω(782) mesons produced in Z0 decays have been measured using the OPAL detector at LEP. Over the measured meson energy range, the values are compatible with 1/3, corresponding to a statistical mix of helicity −1, 0 and +1 states. For the highest accessible scaled energy range 0.3 <xE< 0.6, the measured ρ00 values of the ρ± and the ω are 0.373 ± 0.052 and 0.142 ± 0.114, respectively. These results are compared to measurements of other vector mesons.