Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-09-02
Nucl.Phys.Proc.Suppl. 93 (2001) 220-225
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages using espcrc2.sty, contribution to the 4th Int. Conference on Hyperons, Charm and Beauty Hadrons, Valencia, June 2000
Scientific paper
10.1016/S0920-5632(00)01107-5
Recent advances in our understanding of the higher-wave quarkonia have generated much interests in quarkonium physics. However most are devoted to inclusive decays and productions. Experimental data of several two-body exclusive decay channels of P-wave charmonia such as \pi \pi and p \bar p are available and some have recently been re-measured by the BES collaboration. It is not clear from the outset that color octet is needed for these exclusive channels. Indeed only color singlet has been used in the past and reasonable agreement with data was found. Contrary to these old results, we provide theoretical arguments for the inclusion of color octet and perform explicit calculations to back this up.
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