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

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.

arXiv comment3 pages, 1 figure

References in corpus (4)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Diquarks and Exotic Spectroscopy
• A new look at scalar mesons
• Isospin Mixing of Narrow Pentaquark States

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• Interpretation of $D_{sJ}(2632{)}^{+}$, $D_{s1}(2700{)}^{\pm }$, $D_{sJ}^{\star }(2860{)}^{+}$ and $D_{sJ}(3040{)}^{+}$
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• Possible Interpretations of $D_{sJ}^{+}(2632)$ If It Really Exists
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• The double life of the X meson