Isospin breaking effects in the X(3872) resonance
Daniel Gamermann, Eulogio Oset
TL;DR
This paper investigates how isospin breaking influences the formation of the X(3872) resonance, predicts a new state with negative C-parity, and compares theoretical decay ratios with experimental data.
Contribution
It provides a detailed analysis of isospin breaking effects in the X(3872) and predicts a new negative C-parity partner state.
Findings
Isospin breaking significantly affects the X(3872) formation
Predicted existence of a negative C-parity state
Calculated decay ratios align with experimental measurements
Abstract
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 decaying into 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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