Speaker
Description
The amplitudes describing the decays of neutral b-hadrons to charmless (quasi)-two-body final states receive contributions from b→u tree and b→d,s penguin topologies. This rich landscape of interfering amplitudes allows interesting CP-violation measurements to be performed. In the case of B decays to two vector particles, a full amplitude analysis also provides insight in the so-called polarisation puzzle. In this work, a set of CP-violating observables is measured using $B^0$ meson decays reconstructed from the ($π^+π^−$)($K^+π^−$) quasi-two-body final state. The CP-averaged polarisation fractions and phase differences among the contributing amplitudes are also reported. The analysis uses 3fb$^{−1}$ of data collected during LHCb Run I and consists of the first full amplitude study of this decay mode.
