Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-01-25
Physics
High Energy Physics
High Energy Physics - Phenomenology
3 pages. Contribution to the proceedings of "Quark Confinement and the Hadron Spectrum IX", Universidad Complutense de Madrid,
Scientific paper
The BaBar analysis which favours $2^{-+}$ quantum numbers for the X(3872) implies that it may be none other than the 1D2 charmonia state. In that case the isospin breaking in closed flavour modes may be the result of re-scattering from open flavour. However, the observed production cross section in proton-antiproton collisions is much larger than expectations, while the mass of the state, compared to the predictions of a string model, is too high. The 1D2 assignment would imply a 3D2 partner nearby in mass, which may be the X(3875). In the tetraquark interpretation the $2^{-+}$ assignment implies a rich spectrum of partner states, although the X(3872) may be among the few which are narrow enough to be observable. This talk is based in part on "The 2-+ assignment for the X(3872)" by T. J. Burns, F. Piccinini, A. D. Polosa & C. Sabelli (Phys. Rev. D 82, 074003 (2010); arXiv:1008.0018 [hep-ph]).
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