# $χ {c2} o ρρ$ and the $rho$ polarization in massless perturbative QCD: how to test the distribution amplitudes

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We compute the helicity density matrix of $ho$ vector mesons produced in the two-body decays of polarized $\chi {c2}$-s in the framework of massless perturbative QCD. The $\chi {c2}$-s are either exclusively or inclusively produced in $p \, \bar p$ or $p \, p$ interactions, via quark-antiquark annihilation or gluon fusion. Our results show unambig

Author: Mauro Anselmino; Francesco Murgia

Source: https://archive.org/