Determination of $χ_b$ spin in the decays $χ_{b0,2}\toψψ$ and $χ_{b0,2}\to\JP\JP\to 2(μ^+μ^-)$

Abstract

The decays $χ_{b0,2}\toψψ$ and $χ_{b0,2}\toψψ\to2(μ^+μ^-)$ are considered. It is shown that with the help of $ψ$-meson angular distributions and the distributions by final muon kinematical variables it is possible to determine the spin of the decaying $χ_b$-meson. These distributions can also give an additional information about $ψ$-meson wave functions.