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In the last years, the need of the colour octet state in inclusive P-wavecharmonium decay has been firmly established. However, the implications of thisin the corresponding exclusive reactions have not been fully recognized. Weargue for the necessity of the colour octet in P- and higher-wave quarkoniumdecay. Using a set of phenomenologically constructed baryon wavefunctions, weconsider the Chi_J decay into octet and decuplet baryon-antibaryon pair. Bydoing so, we subject the wavefunctions to a test of applicability. We show thatthe colour singlet component alone is insufficient to account for experimentalmeasurements and only by including the colour octet contribution can thepartial theoretical decay widths be brought into range of the data. By thepresent and earlier applications of the set of wavefunctions, they showthemselves to be reasonable model wavefunctions at around the scale Q^2 \sim10-20 GeV^2.Comment: 58 pages, 17 embedded PS figures, corrected typos, added appendix of  numerical parameters, version to appear in Eur. Phys. J.

Color octet contribution in exclusive P-wave charmonium decay into octet and decuplet baryons