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AbstractAbstract
[en] In this thesis we update the theoretical framework for the QCD calculations of γ*γ → η and γ*γ → η transition form factors at large photon virtualities. This includes a full next-to-leading order analysis of perturbative corrections as well as charm quark contributions, while also taking into account SU(3)-flavor breaking effects and axial anomaly contributions to the power-suppressed twist-four distribution amplitudes. The related numerical analysis of the existing experimental data is performed with these improvements. Moreover, we present an improved light-cone sum rule analysis of the D, D → η/ηlν transition form factors. In this context we argue, that these decays offer a very promising possibility to determine the leading Fock-state gluonic contribution of the η meson in future experimental facilities, such as FAIR or Super-KEKB. We also provide a calculation for the corresponding branching ratios for B decays.
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31 Jan 2019; 357 p; Also available from: http://dx.doi.org/10.5283/epub.40286; Diss. (Dr.rer.nat.)
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Miscellaneous
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Thesis/Dissertation; Numerical Data
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