renormalization group improvements; new physics contributions to flavour observables; Determination of CKM matrix elements; rare B-decays; QCD corrections to electroweak processes; effective field theory; SUSY contributions to rare decays
Aebischer Jason, Crivellin Andreas, Greub Christoph (2015), One-loop SQCD corrections to the decay of top squarks to charm and neutralino in the generic MSSM, in
Phys.Rev., D91(3), 035010-035010.
Fael M., Mercolli L., Passera M. (2015), Radiative μ and τ leptonic decays at NLO, in
JHEP, 07, 153-153.
Misiak M., Asatrian H.M., Greub C., others (2015), Updated NNLO QCD predictions for the weak radiative B-meson decays, in
Phys. Rev. Lett., 114(22), 221801-221801.
Crivellin Andreas, Najjari Saereh, Rosiek Janusz (2014), Lepton Flavor Violation in the Standard Model with general Dimension-Six Operators, in
JHEP, 1404, 167-167.
Asatrian H. M, Greub C. (2014), Next-to-leading logarithmic QCD contribution of the electromagnetic dipole operator to B¯→Xsγγ with a massive strange quark, in
Phys.Rev., D89(9), 094028-094028.
This project on heavy flavour physics embraces a major direction ofresearch that will be under investigation at the Institute for Theoretical Physics at the University of Bern. The main focus of this proposal is on multi-loop calculation for flavour observables in the Standard Model (SM), the two-Higgs-doublet Model of type-II (2HDM-II) and the Minimal Supersymmetric Standard Model(MSSM). The proposal is divided into several subprojects1. Precision calculations in the standard modelA) B -> X_d gamma at NNLL precision in the SMB) Specific NLL contributions to B -> X_s gamma gamma in the SM2. Precision calculations in the MSSM and in the 2HDMsC) 2-loop electroweak corrections to quark-quark-Higgs couplings in the MSSMD) B_{s(d)}-> mu+ mu- in the MSSM at NLOE) Complete NLO predictions for b -> s(d) gammaF) Renormalization of the CKM matrix and B -> tau nu in the 2HDM of type IIThe goal of the first part is the precise calculation of the SM contributions to these flavour-changing neutral current (FCNC) processes. This is important in order to identify possible new physics contributions. The second part aims on a better understanding of the flavour-structure of the MSSM (and of the 2HDM-II). On the one hand, this limits the allowed parameter-space of the MSSM which gives important constraints for model building. On the other hand one can correlate the MSSM predictions for rare decays and judge whether the MSSM could explain possible deviations from the SM predictions.