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

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

2004-07-02

arxiv.org/abs/hep-ph/0407025v1

Phys.Rev.D70:054009,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 1 figure

Scientific paper

10.1103/PhysRevD.70.054009

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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