====== Project C2a: Hadronic matrix elements and exclusive semi-leptonic decays======

^ Principal Investigator                                                                                                                    ||
| [[http://www.physik.uni-siegen.de/tp1/research/researchgroups/feldmann.html?lang=de| Prof. Thorsten  Feldmann  ]]  | University of Siegen  |
| [[https://www.physik.uni-siegen.de/qfet/people/mannel/index.html?lang=de| Prof. Thomas Mannel    ]]                | University of Siegen  |


==== Subject  ====
The goal of this project is the detailed investigation of hadronic matrix elements relevant for exclusive b-decays. This includes mesonic and baryonic transition form factors which will be calculated in the framework of QCD light-cone sum rules. Moreover, we will improve our understanding of light-cone distribution amplitudes for light  and heavy hadrons on the basis of model-independent parameterisations. In this way, we will increase the precision of the theoretical predictions for various heavy hadron decays.





==== Topics ====

  - NNLO QCD corrections:  two loop corrections to scalar penguin amplitude in non-leptonic decays; higher-order corrections to annihilation topologies
  - QED corrections in the factorization framework:  Semi-leptonic  operators in $B \to K^{(*)}\ell^+\ell^-$; hadronic operators in $B \to K^{(*)} \ell^+\ell^-$ and non-leptonic decays; QED corrections to heavy-to-light form factors; isospin-violating observables and violation of lepton-flavour universality.
  - Power corrections in exclusive $B$-meson decays:  factorization of endpoint divergencies in $B \to \pi$ form factor; extension  to non-leptonic and rare decays
  - Phenomenology of Non-leptonic Decays:  comprehensive NNLO analysis of $B \to PP,PV,VV$ decays; combination of QCDF with flavour-symmetries of the light quarks; two-body decays beyond the quasi-particle approximation;
  - Phenomenology of rare semi-leptonic and radiative decays:  precision phenomenology for $B\to K^{(*)}\ell^+\ell^-$ at large hadronic recoil realistic parametrization of hadronic resonances beyond factorization, rare radiative decays of $B_s$, $B_c$ and $\Lambda_b$.
 


==== Related publications ====

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