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2015

Y(4260) --> gamma + X(3872) in the diquarkonium picture

Chen, H. -X., Maiani, L., Polosa, A. D. et al.

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The observed Y(4260)\to \gamma + X(3872) decay is a natural consequence of the diquark-antidiquark description of Y and X resonances.

In this note we attempt an estimate of the transition rate, \Gamma_{\rm rad}, by a non-relativistic calculation of the electric dipole term of a diquarkonium bound state.
We compute \Gamma_{\rm rad} for generic composition values of the isospin of X and Y.
Specializing to I=0 for X(3872), we find \Gamma_{\rm rad}= 496~keV for Y(4260) with I=0 and \Gamma_{\rm rad}= 179~keV for I=1.

Y(4260) --> gamma + X(3872) in the diquarkonium picture · Around

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