Theory and phenomenology of two-Higgs-doublet models

We review the present status of QCD corrections to weak decays beyond the leading-logarithmic approximation, including particle-antiparticle mixing and rare and $\mathrm{CP}$-violating decays. After presenting the basic formalism for these calculations we discuss in detail the effective Hamiltonians of all decays for which the next-to-leading-order corrections are known. Subsequently, we present the phenomenological implications of these calculations. The values of various parameters are updated, in particular the mass of the newly discovered top quark. One of the central issues in this review are the theoretical uncertainties related to renormalization-scale ambiguities, which are substantially reduced by including next-to-leading-order corrections. The impact of this theoretical improvement on the determination of the Cabibbo-Kobayashi-Maskawa matrix is then illustrated. [S0034-6861(96)00304-2]

Weak decays beyond leading logarithms

https://cds.cern.ch/record/566059/files/arXiv:hep-ph_0207036.pdf

Minimal flavour violation: an effective field theory approach

SPheno, a program for calculating supersymmetric spectra, SUSY particle decays and SUSY particle production at e+e− colliders☆

SPheno 3.1: extensions including flavour, CP-phases and models beyond the MSSM☆

The b → se+e− and b → sγ decays with next-to-leading logarithmic QCD-corrections

Weak radiative B-meson decay beyond leading logarithms [Phys. Lett. B 400 (1997) 206]

Electromagnetic logarithms in B¯→Xsℓ+ℓ−

Three-loop matching of the dipole operators for b→sγ and b→sg

The flavor changing neutral current processes {ital K}{sub {ital L}}{r_arrow}{pi}{sup 0}{ital e}{sup +}{ital e}{sup {minus}}, {ital B}{r_arrow}{ital X}{sub {ital s}}{ital e}{sup +}{ital e}{sup {minus}}, and {ital B}{r_arrow}{ital X}{sub {ital s}}{mu}{sup +}{mu}{sup {minus}} are studied within the minimal supersymmetric extension of the standard model. We first examine the rates for these decay modes in the MSSM with a universal soft supersymmetry breaking sector at a grand unification scale. We later relax the universality condition and investigate the FCNC transitions in a more general class of models with negligible flavor violation in squark mixing matrices. We find that the MSSM prediction for the kaon channel{close_quote}s branching fraction differs from its standard model value by at most 30{percent} over the entire allowed parameter space. On the other hand, supersymmetric contributions could potentially enhance certain {ital B}{r_arrow}{ital X}{sub {ital s}}{ital l}{sup +}{ital l}{sup {minus}} observables by more than 100{percent} relative to standard model expectations. The impact of supersymmetry upon the {ital B} meson modes is strongly correlated with the MSSM value for the Wilson coefficient of the magnetic moment operator that mediates {ital B}{r_arrow}{ital X}{sub {ital s}}{gamma}. {copyright} {ital 1996 The American Physical Society.}

Mikołaj Misiak

Papers

The b → se+e− and b → sγ decays with next-to-leading logarithmic QCD-corrections

Weak radiative B-meson decay beyond leading logarithms [Phys. Lett. B 400 (1997) 206]

Electromagnetic logarithms in B¯→Xsℓ+ℓ−

Three-loop matching of the dipole operators for b→sγ and b→sg

KL--> pi 0e+e- and B-->Xsl+l- decay in the MSSM.