  We investigate rare semileptonic $B \to K^\ast\ell^+\ell^-$ by looking at the
long distance contributions. Our analysis is limited to the very small values
of physical accessible range of invariant mass of the leptonic couple $q^2$. We
show that the light quarks loop has to be accounted for, along with the
charming penguin contribution, in order to accurately compute the
$q^2$-spectrum in the Standard Model. Such a long distance contribution may
also play a role in the analysis of the lepton flavour universality violation
in this process.

High Energy Physics - Phenomenology;High Energy Physics - Experiment