Thep - \bar p decays ofP-wave quarkonium and the helicity characteristics of massless QCD |
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Authors: | A Andrikopoulou |
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Affiliation: | 1. The Blackett Laboratory, Imperial College, Prince Consort Road, SW7 2BZ, London, UK
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Abstract: | We consider the exclusive \(p - \bar p\) decays of the quarkoniumP-states. Due to the helicity conservation of massless QCD the \(p - \bar p\) mode is forbidden in this limit for the1 P 1 and the3 P 0 states. The angular distributions for the decays of the remaining states in the cascade \(^3 S\prime _1 \to \gamma ^3 P_J \to \gamma p\bar p\) are specific to QCD and can serve as a test of the theory. The same is true of the formation process \(p\bar p \to ^3 P_J \to ^3 S_1 \gamma \) . In lowest order QCD we obtain overall branching ratios for charmonium of the order of 10?4. |
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