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Is the anomalous decay ratio of D_{sJ}(2632) due to isospin breaking?

L. Maiani·F. Piccinini·A. D. Polosa·V. Riquer
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Abstract

Quark pair annihilation into gluons is suppressed at large momenta due to the asymptotic freedom. As a consequence, mass eigenvalues of heavy states should be almost diagonal with respect to up and down quark masses, thereby breaking isospin. We suggest the particle observed by the SELEX Collaboration, D_{sJ}(2632) to be to a good extent a [cd][dbar sbar] state, which would explain why its D^0 K^+ mode is anomalously suppressed with respect to D_s eta. Predictions for the rates of the yet unobserved modes D_s pi^0 and D^+ K^0 are given.

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L. Maiani, F. Piccinini, A. D. Polosa, V. Riquer. 2004-07-02. Is the anomalous decay ratio of D_{sJ}(2632) due to isospin breaking?. https://doi.org/10.1103/physrevd.70.054009

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