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The conspicuous threshold enhancement has been observed in thebaryon-antibaryon subchannels of many three-body B decay modes. By examiningthe partial waves of baryon-antibaryon, we first show for B- -->pp-bar K- thatthe pK- angular correlation rules out dominance of a single pp-bar partial wavefor the enhancement, for instance, the resonance hypothesis or the strongfinal-state interaction in a single channel. The measured pK- angularcorrelation turns out to be opposite to the naive expectation of theshort-distance picture. We study the origin of this reversed angularcorrelation in the context of the pp-bar partial waves and argue that NN-barbound states may be the cause of this sign reversal. Dependence of the angularcorrelation on the pp-bar invariant mass is very important to probe theunderlying problem from the experimental side.Comment: 16 pages, 9 figures, the version for journal publicatio

Partial waves of baryon–antibaryon in three-bodyBmeson decay