Probing New Physics in $b \to d$ Transitions

Understand

Recent experimental data on several observables in semileptonic $B$-meson decays are found to be in tension with the corresponding Standard Model predictions.

• Most of these deviations are related to $b \to c$ and $b \to s$ flavour changing transitions.
• In this work, we estimate possible New Physics effects in $b \to d \mu^+ \mu^-$ flavour changing neutral currents.
• We parametrize NP contributions in a model-independent way and determine the allowed ranges of corresponding Wilson coefficients from the data on the exclusive $B^\pm \to \pi^\pm \mu^+ \mu^-$ decays measured recently by the LHCb collaboration.