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Abstract |
We propose the Ab – phi eta Lambda reaction to observe a Pcs state around 4200 MeV, predicted at lower masses than expected from comparison with the Pe states, stemming as a consequence of the important role played by coupled channels in the Pcs case, which does not appear in the Pe case. That state decays to eta with a width of about 200 keV. The reaction is related to ADA, which has already been observed. We predict a branching fraction for Ap -> PG(4200); Pcsnc of the order of 105, which is within present capabilities of the LHCb collaboration. The observation of this state would bring valuable light on the nature of the Pc and Pcs states and the role played by coupled channels in hadron structure and hadron reactions. |
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