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.
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 a
ngle 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).
The nucleon electromagnetic form factors are calculated in light cone QCD sum rules framework using the most general form of the nucleon interpolating current. Using two forms of the distribution amplitudes (DAs), predictions for the form factors are
presented and compared with existing experimental data. It is shown that our results describe remarkably well the existing experimental data.
