Speaker
Dr
Javier Vijande
(Univ. Valencia)
Description
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)
