Isospin breaking effects in the X(3872) resonance
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In this paper we study the effects of isospin breaking in the dynamical generation of the X(3872) state. We also calculate the ratio of the branching fractions of the X decaying into J/ψ with two and three pions, which has been measured experimentally to be close to unity. Together with the X(3872), of positive C-parity, we predict the existence of a negative C-parity state and we comment on which decay channel is more promising to observe this state.
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Gamermann, D. Oset Báguena, Eulogio 2009 Isospin breaking effects in the X(3872) resonance Physical Review D 80 1 014003
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