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We draw attention on the procedure, where Standard Model predictions and experimental results are compared and certain new physics scenarios are ruled out, that requires great attention, since there is still a room for new physics, especially when contributions of extended models bear complex phases. We observe that this is true even when SM and experiment yield the same results with zero uncertainties.
We perform a data-driven analysis of new physics (NP) effects in exclusive $b to s ell^+ell^-$ decays in a model-independent effective theory approach with dimension six operators considering scalar, pseudo-scalar, vector and axial-vector operators w
We present first results for Wilson coefficients of operators up to first order in the covariant derivatives for the case of Wilson fermions. They are derived from the off-shell Compton scattering amplitude $mathcal{W}_{mu u}(a,p,q)$ of massless quar
We carefully analyse the present experimental evidence for a complex CKM matrix, even allowing for New Physics contributions to $epsilon_{K}$, $a_{J/Psi K_S}$, $Delta M_{B_{d}}$, $Delta M_{B_{s}}$, and the $Delta I=1/2$ piece of $Btorhorho$ and $Btor
A number of observables related to the $b to s l^+ l^-$ transition show deviations from their standard model predictions. A global fit to the current $brightarrow sl^+l^-$ data suggests several new physics solutions. Considering only one operator at
We report on results for the heavy flavor contributions to $F_2(x,Q^2)$ in the limit $Q^2gg m^2$ at {sf NNLO}. By calculating the massive $3$--loop operator matrix elements, we account for all but the power suppressed terms in $m^2/Q^2$. Recently, th