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F. A. Porkert

Publications and source records attributed to F. A. Porkert.

4 recordsLinked to original sources
arXiv2014

Transition form factors $γ^*γ\toη$ and $γ^*γ\toη'$ in QCD

We update the theoretical framework for the QCD calculation of transition form factors $γ^*γ\toη$ and $γ^*γ\toη'$ at large photon virtualities including full next-to-leading order analysis of perturbative corrections, the charm quark contribution, and taking into account SU(3)-flavor breaking effects and the axial anomaly contributions to the power-suppressed twist-four distribution amplitudes. The numerical analysis of the existing experimental data is performed with these improvements.

hep-ph↗
arXiv2013

Light-Cone Sum Rules for the $D_{(s)}\rightarrow η^{(\prime)} l ν_l$ Form Factor

We present an improved light-cone sum rule analysis of the decay form factors of $D$ and $D_s$ into $η$ and $η^{\prime}$ and argue that these decays offer a very promissing possibility to determine the leading Fock-state gluonic contribution of the $η'$ at future experimental facilities as FAIR or Super-KEKB. We also give the corresponding branching ratios for B decays.

hep-ph↗
arXiv2010

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.

hep-ph↗