Colour-octet NLO QCD corrections to hadronic χJ decays

In this paper we present a complete next-to-leading order QCD calculation of the χJ(3PJ; J = 0, 1, 2) hadronic decay width. We include the NLO colour-octet contribution, as define in the Bodwin, Braaten and Lepage formalism. We extract an estimate of the colour-octet parameter H8 from the charmonium decay data.