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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: 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, COQUEREAU, S., GARRIDO BELTRÁN, Lluís, GASCON, D., GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, MARIN BENITO, Carla, PICATOSTE OLLOQUI, Eduardo, RIVES MOLINA, Vicente josé, ALFONSO ALBERO, Alejandro, CALVO GOMEZ, M., GIRONELLA GIRONELL, P., VAZQUEZ GOMEZ, R., LHCb Collaboration. Search for CP violation in the phase space of D0 → π+π-π+π- decays. _Physics Letters B_. 2017. Vol. 769, núm. 345-356. [consulta: 24 de gener de 2026]. ISSN: 0370-2693. [Disponible a: https://hdl.handle.net/2445/186474]