The two gluons from chi_b0 decay carry correlated linear polarizations, so the angular correlation between two pion pairs can directly probe the previously unmeasured linearly polarized gluon dihadron fragmentation function.
The framework can also be extended toη b decays and to other polarization-sensitive observables, including TMD spin correlations and en- ergy correlators
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Probing Gluon Linear Polarization with Dihadron Fragmentation in $\chi_b$ Decays
The two gluons from chi_b0 decay carry correlated linear polarizations, so the angular correlation between two pion pairs can directly probe the previously unmeasured linearly polarized gluon dihadron fragmentation function.