Search for CP violation in the phase space of D0 → π+π−π+π−decays

A search for time-integrated CP violation in the Cabibbo-suppressed decay D 0 → π + π − π + π − is performed using an unbinned, model-independent technique known as the energy test. This is the first application of the energy test in four-body decays. The search is performed for P-even CP asymmetries and, for the first time, is extended to probe the P-odd case. Using proton–proton collision data corresponding to an integrated luminosity of 3.0 fb-1 collected by the LHCb detector at centre-of-mass energies of √S = 7 TeV and 8 TeV, the world's best sensitivity to CP violation in this decay is obtained. The data are found to be consistent with the hypothesis of CP symmetry with a p-value of 4.6 +-0.5 % in the P-even case, and marginally consistent with a p-value of 0.6+-0.2 % in the P-odd case, corresponding to a significance for CP non-conservation of 2.7 standard deviations.