Symmetries in the angular distribution of exclusive semileptonic B decays
We discuss a method to construct observables protected against QCD uncertainties based on the angular distribution of the exclusive Bd -> K(*0}(-> Kpi) l+ l- decay. We focus on the identification and the interpretation of all the symmetries of the distribution. They constitute a key ingredient to construct a set of so-called transverse observables. We work in the framework of QCD factorization at NLO supplemented by an estimate of power-suppressed Lambda/mb corrections. A discussion of the new physics properties of two of the transverse asymmetries, AT^{(2)} and AT^{(5)}, is presented. A comparison between the transverse asymmetry AT^{(2)} and the forward-backward asymmetry shows that…
CPasymmetries inBsdecays and spontaneousCPviolation
We study the possible effects of new physics in $\mathrm{CP}$ asymmetries in two-body ${B}_{s}$ decays in left-right models with spontaneous $\mathrm{CP}$ violation. Considering the contributions of new $\mathrm{CP}$ phases to the ${B}_{s}$ mixing as well as to the penguin-dominated decay amplitudes we show that, with the present constraints, large deviations from the standard model predictions in $\mathrm{CP}$ asymmetries are allowed in both cases. The detection of new physics can be achieved by measuring nonzero asymmetries which are predicted to vanish in the standard model or by comparing two measurements which are predicted to be equal in the standard model. In particular, we show that…
The decay
In this paper the potential for the discovery of new physics in the exclusive decay B ¯ d → K ¯ ⁎ 0 μ + μ − is discussed. Attention is paid to constructing observables which are protected from uncertainties in QCD form factors and at the same time observe the symmetries of the angular distribution. We discuss the sensitivity to new physics in the observables including the effect of CP-violating phases.