2 research outputs found
QCD Sum Rules for the production of the X(3872) as a mixed molecule-charmonium state in B meson decay
We use QCD sum rules to calculate the branching ratio for the production of
the meson X(3872) in the decay , assumed to be a mixture between
charmonium and exotic molecular states with
. We find that in a small range for the values of the mixing
angle, , we get the branching ratio
, which is in agreement with
the experimental upper limit. This result is compatible with the analysis of
the mass and decay width of the mode and the radiative decay
mode performed in the same approach.Comment: 6 pages, 3 figures; revised versions to appear on Phys. Lett.
Interplay of quark and meson degrees of freedom in a near-threshold resonance: multi-channel case
We investigate the interplay of quark and meson degrees of freedom in a
physical state representing a near-threshold resonance for the case of multiple
continuum channels. The aim is to demonstrate the full complexity of
near-threshold phenomena. It turns out that those are especially rich, if both
quark and meson dynamics generate simultaneously weakly coupled near-threshold
poles in the S-matrix. We study the properties of this scenario in detail, such
as t-matrix and production amplitude zeros, as well as various effects of the
continuum channels interplay.Comment: LaTeX2e, 10 pages, version to appear in Eur.Phys.J.