Angular analysis of B --> V (--> P_1 P_2) l^+ l^- decays

Understand

The angular analysis of exclusive rare B-meson decays via intermediate vector mesons V into 4-body final states of two pseudo-scalars P_1, P_2 and a pair of light leptons l = e, mu offers a large set of observables.

• They can be used to test the electroweak short-distance couplings in the Standard Model and to search for New Physics.
• The two kinematic regions of low and high dilepton mass depend on short-distance physics in complementary ways and can be expanded in powers of Lambda_QCD/m_b.
• These expansions guide towards suitable combinations of observables allowing to i) reduce the hadronic uncertainties in the extraction of the short-distance couplings or ii) test the lattice QCD (B -> V) form factors in short-distance independent combinations.