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.
We next assess the sensitivity of the predicted asymme- try to the poorly known LDME ratioρ 8
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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.