Fig. 3: Analysis of angular distributions.
From: Determination of the spin and parity of all-charm tetraquarks
a, Distributions of \({{\mathcal{D}}}_{{2}_{{\rm{m}}}^{+}{0}^{-}}\) for the 0−, \({2}_{{\rm{m}}}^{-}\), and \({2}_{{\rm{m}}}^{+}\) models in the range 6.2 < m4μ < 8.0 GeV. Distributions for signal only (dashed) and for signal plus background (solid and dash-dot-dotted) models are compared with the experimental data points with error bars, with uncertainty bands representing post-fit model uncertainties, which are partially correlated with the data. The 0− and \({2}_{{\rm{m}}}^{-}\) distributions are identical apart from systematic uncertainties arising from polarization effects. b, Normalized distributions of the test statistic \(q=-\,2{\rm{ln}}({{\mathcal{L}}}_{{0}^{-}}/{{\mathcal{L}}}_{{2}_{{\rm{m}}}^{+}})\) from pseudo-experiments generated under the \({2}_{{\rm{m}}}^{+}\) (blue, right) and 0− (orange, left) hypotheses, with the arrow indicating the observed value qobs.
