Jun 13 – 17, 2011
Europe/Berlin timezone
Proceedings are now available online at <a href="http://www.slac.stanford.edu/econf/C110613/">eConf</a>

Exotic gifts of nature

Jun 16, 2011, 2:30 PM
Millerzimmer (Universe)



talk Quarkonia Quarkonia


Dr Javier Vijande (Univ. Valencia)


We perform a systematic analysis of doubly charmed exotic states as meson-meson molecules [1]. We compare our results with those previously obtained within the hyperspherical harmonic formalism[2]. Several relevant conclusions have to be emphasized. First of all, the conclusive existence of a stable isoscalar doubly charmed meson with quantum numbers $(I)J^P=(0)1^+$. This state could be considered as a {\it gift of nature}, because there is compelling evidence that such large mass exotic states could be efficiently produced via gluon-gluon fusion at LHC with unique signatures in the detectors and also at RHIC. Second, we revise hadron-hadron scattering calculations within the quark model showing that they have to be done in a complete Hilbert space. The effects coming from the inclusion of the relevant vectors of the Hilbert space could be hidden in the parameters of the model, but this would make that the calculations were not predictive because the parameters have to be different for each quantum number sector. Such a procedure would drive to spurious conclusions. Third, the discovery of these states will undoubtedly give an important push in our understanding of the meson spectroscopy above the threshold for the production of two mesons. Finally, our study highlights the difficulty to generate deeply bound states within the quark model framework when dealing with the threshold and the many-quark system on the same footing. An experimental effort in this direction will confirm or rule out the theoretical expectations. If the scenario presented here turns out to be correct, it will open a new interesting spectroscopic era. [1] T.F. Caramés, A. Valcarce, and J. Vijande; Phys. Lett. B in press (2011). [2] J.Vijande, A. Valcarce, and N. Barnea, Phys. Rev. D 79, 074010 (2009).

Primary authors

Dr Alfredo Valcarce (Univ. Salamanca) Dr Javier Vijande (Univ. Valencia) Dr Teresa Caramés (Univ. Salamanca)

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