Polarisation of the omega meson in the pd-->3He+omega reaction at 1360 and 1450 MeV
K. Schonning, Chr. Bargholtz, M. Bashkanov, M. Berlowski, D., Bogoslawsky, H. Calen, H. Clement, L. Demirors, C. Ekstrom, K. Fransson, L., Geren, L. Gustafsson, B. Hoistad, G. Ivanov, M. Jacewicz, E. Jiganov, T., Johansson, S. Keleta, O. Khakimova, I. Koch, F. Kren, S. Kullander
TL;DR
This study investigates the tensor polarisation of omega mesons produced in proton-deuteron reactions near threshold energies, finding omega mesons unpolarised, which challenges existing theoretical assumptions about meson production rules.
Contribution
It provides the first experimental measurement of omega meson polarisation in this reaction at near-threshold energies, questioning the applicability of the OZI rule in such processes.
Findings
Omega mesons are unpolarised in the studied reaction.
Results contrast with phi meson production, which shows polarisation.
Challenges current understanding of meson production rules.
Abstract
The tensor polarisation of omega mesons produced in the pd-->3He+omega reaction has been studied at two energies near threshold. The 3He nuclei were detected in coincidence with the pi0pi+pi- or pi0gamma decay products of the omega. In contrast to the case of phi meson production, the omega mesons are found to be unpolarised. This brings into question the applicability of the Okubo-Zweig-Iizuka rule when comparing the production of vector mesons in low energy hadronic reactions.
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