Search for CP violation through an amplitude analysis of D ⁰ → K ⁺ K ⁻ π ⁺ π ⁻ decays

A search for CP violation in the Cabibbo-suppressed D ⁰ → K ⁺ K ⁻ π ⁺ π ⁻ decay mode is performed using an amplitude analysis. The measurement uses a sample of pp collisions recorded by the LHCb experiment during 2011 and 2012, corresponding to an integrated luminosity of 3.0 fb ⁻¹ . The D ⁰ mesons are reconstructed from semileptonic b-hadron decays into D ⁰ μ ⁻ X final states. The selected sample contains more than 160 000 signal decays, allowing the most precise amplitude modelling of this D ⁰ decay to date. The obtained amplitude model is used to perform the search for CP violation. The result is compatible with CP symmetry, with a sensitivity ranging from 1% to 15% depending on the amplitude considered.[Figure not available: see fulltext.]