Within the standard approach of effective field theory of weak interactions for

We critically reassess the theoretical uncertainties in the Standard Model calculation of the B → K ^∗ ℓ ⁺ ℓ ⁻ observables, focusing on the low q ² region. We point out that even optimized observables are affected by sizable uncertainties, since hadronic contributions generated by current-current operators with charm are difficult to estimate, especially for q ² ∼ 4m ² _c ≃ 6.8 GeV². We perform a detailed numerical analysis and present both predictions and results from the fit obtained using most recent data. We find that non-factorizable power corrections of the expected order of magnitude are sufficient to give a good description of current experimental data within the Standard Model. We discuss in detail the q ² dependence of the corrections and their possible interpretation as shifts of the Standard Model Wilson coefficients.

In the original version of this manuscript, an error was introduced on pp352. ‘2.7nb:1.6nb’ has been corrected to ‘2.4nb:1.3nb’ in the current online and printed version.

Is a flexible open-source tool which, given the Standard Model or any of its extensions, allows to (i) fit the model parameters to a given set of experimental observables; (ii) obtain predictions for observables. can be used either in Monte Carlo mode, to perform a Bayesian Markov Chain Monte Carlo analysis of a given model, or as a library, to obtain predictions of observables for a given point in the parameter space of the model, allowing to be used in any statistical framework. In the present version, around a thousand observables have been implemented in the Standard Model and in several new physics scenarios. In this paper, we describe the general structure of the code as well as models and observables implemented in the current release.

In light of the very recent updates on the [equation] and [equation] measurements from the LHCb and Belle collaborations, we systematically explore here imprints of New Physics in [equation]...