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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/186474
Search for CP violation in the phase space of D0 → π+π-π+π- decays
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A search for time-integrated CP violation in the Cabibbo-suppressed decay D0 →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.
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CAMBONI, Alessandro, et al. Search for CP violation in the phase space of D0 → π+π-π+π- decays. Physics Letters B. 2017. Vol. 769, num. 345-356. ISSN 0370-2693. [consulted: 9 of June of 2026]. Available at: https://hdl.handle.net/2445/186474