A search for time-dependent violation of the charge-parity symmetry in D0 → K+ K− and D0 → π+ π− decays is performed at the LHCb experiment using proton-proton collision data recorded from 2015 to 2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb^−1. The D0 meson is required to originate from a D*(2010)+ → D0 π+ decay, such that its flavor at production is identified by the charge of the accompanying pion. The slope of the time-dependent asymmetry of the decay rates of D0 and anti-D0 mesons into the final states under consideration is measured to be ΔY_K+K− = (− 2.3 ± 1.5 ± 0.3) × 10^−4, ΔY_π+π− = (− 4.0 ± 2.8 ± 0.4) × 10^−4, where the first uncertainties are statistical and the second are systematic. These results are compatible with the conservation of the charge-parity symmetry at the level of 2 standard deviations and improve the precision by nearly a factor of 2.

Search for Time-Dependent CP Violation in D0 → K+ K− and D0 → π+ π− Decays

Calabrese, R.;Capriotti, L.;Couturier, B.;Fiorini, M.;Franzoso, E.;Giugliano, C.;Guarise, M.;Kotriakhova, S.;Luppi, E.;Neri, I.;Pappalardo, L. L.;Passalacqua, B.;Tomassetti, L.;
2021

Abstract

A search for time-dependent violation of the charge-parity symmetry in D0 → K+ K− and D0 → π+ π− decays is performed at the LHCb experiment using proton-proton collision data recorded from 2015 to 2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb^−1. The D0 meson is required to originate from a D*(2010)+ → D0 π+ decay, such that its flavor at production is identified by the charge of the accompanying pion. The slope of the time-dependent asymmetry of the decay rates of D0 and anti-D0 mesons into the final states under consideration is measured to be ΔY_K+K− = (− 2.3 ± 1.5 ± 0.3) × 10^−4, ΔY_π+π− = (− 4.0 ± 2.8 ± 0.4) × 10^−4, where the first uncertainties are statistical and the second are systematic. These results are compatible with the conservation of the charge-parity symmetry at the level of 2 standard deviations and improve the precision by nearly a factor of 2.
2021
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C. A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2500468
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