A search for time-integrated CP violation in the Cabibbo-suppressed decay D0âÏ+ÏâÏ+Ïâis 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 protonâproton collision data corresponding to an integrated luminosity of 3.0 fbâ1collected 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.
Search for CP violation in the phase space of D0 -> pi+ pi- pi+ pi- decays
De Serio, M.;Pappagallo, M.;
2017-01-01
Abstract
A search for time-integrated CP violation in the Cabibbo-suppressed decay D0âÏ+ÏâÏ+Ïâis 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 protonâproton collision data corresponding to an integrated luminosity of 3.0 fbâ1collected 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.