42 research outputs found

### Mixing Angle of Hadrons in QCD: A New View

A new method for calculation of the mixing angle between the hadrons within
QCD sum rules is proposed. In this method, the mixing is expressed in terms of
quark and gluon degrees of freedom. As an application, the detailed calculation
of the mixing angle between heavy cascade baryons Xi_Q and Xi_Q', Q=c,~b is
presented and it is found that the mixing angle between Xi_b (Xi_c) and Xi_b'
(Xi_c') is given by theta_b = 6.4^\circ \pm 1.8 ^\circ (theta_c = 5.5^\circ \pm
1.8^\circ).Comment: 10 pages, 4 figures, 1 table, Changes in the text onl

### X(3872) and its Partners in the Heavy Quark Limit of QCD

In this letter, we propose interpolating currents for the X(3872) resonance,
and show that, in the Heavy Quark limit of QCD, the X(3872) state should have
degenerate partners, independent of its internal structure. Magnitudes of
possible I=0 and I=1 components of the X(3872) are also discussed.Comment: 12 page

### Vector meson dominance and radiative decays of heavy spin-3/2 baryons to heavy spin--1/2 baryons

Using the calculated values of the strong coupling constants of the heavy
sextet spin-3/2 baryons to sextet and antitriplet heavy spin-1/2 baryons with
light mesons within the light cone QCD sum rules method, and vector meson
dominance assumption, the radiative decay widths are calculated. These widths
are compared with the "direct" radiative decay widths predicted in the
framework of the light cone QCD sum rules.Comment: 8 pages, no figures, LaTeX formatte

### Unitary Structure of the QCD Sum Rules and KYN and KY\Xi Couplings

New relations between QCD Borel sum rules for strong coupling constants of
K-mesons to baryons are derived. It is shown that starting from the sum rule
for the coupling constants $g_{\pi\Sigma\Sigma}$ and $g_{\pi\Sigma\Lambda}$ it
is straightforward to obtain corresponding sum rules for the $g_{K Y N}$, $g_{K
Y \Xi}$ couplings, $Y=\Sigma,\Lambda$.Comment: 7 pages, 2 tables, International Workshop on Quantum
Chromodynamics:Theory and Experiment, QCD@Work-2005, Coversano(Bari, Italy),
16-20 June, 200

### Light vector meson octet-decuplet baryon vertices in QCD

The strong coupling constants between light vector mesons and octet-decuplet
baryons are calculated in framework of the light cone QCD sum rules, taking
into account SU(3) flavor symmetry breaking effects. It is shown that all
strong coupling constants can be represented in terms of a single universal
function. Size of the SU(3) symmetry breaking effects are estimated.Comment: 27 pages, 6 figures, LaTeX formatte