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Isospin Violation in X(3872): Explanation From a New Tetraquark Model · Around

2010

Isospin Violation in X(3872): Explanation From a New Tetraquark Model

Karliner, Marek, Lipkin, Harry J.

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New data for X(3872) production in B decays provide a separation between X production and decay, sharpen several experimental puzzles and impose serious constraints on all models.

Both charged and neutral B decays produce a narrow neutral resonant state that decays to both J/\psi \rho and J/\psi \omega, while no charged resonances in the same multiplet are found.
This suggests that the X is an isoscalar resonance whose production conserves isospin, while isospin is violated only in the decay by an electromagnetic interaction allowing the isospin-forbidden J/\psi \rho decay.
A tetraquark isoscalar X model is proposed which agrees with all present data, conserves isospin in its production and breaks isospin only in an electromagnetic X(3872) --> J/\psi \rho^o decay.

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For a recent review on X ⁡ ( 3872 ) X(3872) , see Sec. 5.4 of S. Godfrey, arXiv:0910.3409 [hep-ph]

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2010

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