A measurement of the time-dependent ratio of the D0 → K+ π− to anti-D0 → K+ π− decay rates is reported. The analysis uses a sample of proton-proton collisions corresponding to an integrated luminosity of 6 fb^−1 recorded by the LHCb experiment from 2015 through 2018 at a center-of-mass energy of 13 TeV. The D0 meson is required to originate from a D*(2010)+ → D0 π+ decay, such that its flavor at production is inferred from the charge of the accompanying pion. The measurement is performed simultaneously for the K+ π− and K− π+ final states, allowing both mixing and CP-violation parameters to be determined. The value of the ratio of the decay rates at production is determined to be R_Kπ = (343.1 ± 2.0) × 10^−5. The mixing parameters are measured to be c_Kπ = (51.4 ± 3.5) × 10^−4 and c′_Kπ = (13 ±4) × 10^−6, where √R_Kπ c_Kπ is the linear coefficient of the expansion of the ratio as a function of decay time in units of the D0 lifetime, and c′_Kπ is the quadratic coefficient, both averaged between the K+ π− and K− π+ final states. The precision is improved relative to the previous best measurement by approximately 60%. No evidence for CP violation is found.

Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. A., et al. (2025). Measurement of D0-antiD0 mixing and search for CP violation with D0 → K+ π− decays. PHYSICAL REVIEW D, 111(1), 1-25 [10.1103/physrevd.111.012001].

Measurement of D0-antiD0 mixing and search for CP violation with D0 → K+ π− decays

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;
2025

Abstract

A measurement of the time-dependent ratio of the D0 → K+ π− to anti-D0 → K+ π− decay rates is reported. The analysis uses a sample of proton-proton collisions corresponding to an integrated luminosity of 6 fb^−1 recorded by the LHCb experiment from 2015 through 2018 at a center-of-mass energy of 13 TeV. The D0 meson is required to originate from a D*(2010)+ → D0 π+ decay, such that its flavor at production is inferred from the charge of the accompanying pion. The measurement is performed simultaneously for the K+ π− and K− π+ final states, allowing both mixing and CP-violation parameters to be determined. The value of the ratio of the decay rates at production is determined to be R_Kπ = (343.1 ± 2.0) × 10^−5. The mixing parameters are measured to be c_Kπ = (51.4 ± 3.5) × 10^−4 and c′_Kπ = (13 ±4) × 10^−6, where √R_Kπ c_Kπ is the linear coefficient of the expansion of the ratio as a function of decay time in units of the D0 lifetime, and c′_Kπ is the quadratic coefficient, both averaged between the K+ π− and K− π+ final states. The precision is improved relative to the previous best measurement by approximately 60%. No evidence for CP violation is found.
2025
Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. A., et al. (2025). Measurement of D0-antiD0 mixing and search for CP violation with D0 → K+ π− decays. PHYSICAL REVIEW D, 111(1), 1-25 [10.1103/physrevd.111.012001].
Aaij, R.; Abdelmotteleb, A.  S.  W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapop...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1006209
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