S. S. Agaev

Light Cone Sum Rules for the pi0-gamma*-gamma Form Factor Revisited

We provide a theoretical update of the calculations of the pi0-gamma*-gamma form factor in the LCSR framework, including up to six polynomials in the conformal expansion of the pion distribution amplitude and taking into account twist-six corrections related to the photon emission at large distances. The results are compared with the calculations of the B-> pi l nu decay and pion electromagnetic form factors in the same framework. Our conclusion is that the recent BaBar measurements of the pi0-gamma*-gamma form factor at large momentum transfers are consistent with QCD, although they do suggest that the pion DA may have more structure than usually assumed.

Width of the exotic Xb (5568) state through its strong decay to Bs0 π

The width of the newly observed exotic state

Mass and decay constant of the newly observed exotic X ( 5568 ) state

X_b(5568)

Exploring X(5568) as a meson molecule

is calculated via its dominant strong decay to

Charmed partner of the exotic

% B_s^{0} \pi^{+}

X(5568)

using the QCD sum rule method on the light-cone in conjunction with the soft-meson approximation. To this end, the vertex

state and its properties

X_{b}B_{s}\pi

BELLE Data on the

is studied and the strong coupling

\pi^0 \gamma* \gamma

g_{X_{b}B_{s}\pi}

Form Factor: A Game Changer?

is computed employing for