Answers are grounded in this paper and cite their sources.
The spin alignment of 2.2×{}10⁶ J/{ψ} particles produced in 252-GeV {π}N interactions has been measured via their decay to μ⁺{{μ}}^{{{-}}}in an experiment at Fermilab. Whereas J/ψ's are produced unpolarized over most of the kinematic range, they are found to become longitudinally polarized as{x}F${→}1.
No takes yet. Share an insight, caveat, or question.
Biino et al. (1987) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: