A measurement of the time-dependent ratio of the D0→K+π- to D¯0→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)+→D0π+ 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 RKπ=(343.1±2.0)×10-5. The mixing parameters are measured to be cKπ=(51.4±3.5)×10-4 and cKπ′=(13±4)×10-6, where RKπcKπ is the linear coefficient of the expansion of the ratio as a function of decay time in units of the D0 lifetime, and cKπ′ 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., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2025). Measurement of D0- D ¯ 0 mixing and search for CP violation with D0 →k+π- decays. PHYSICAL REVIEW D, 111(1) [10.1103/PhysRevD.111.012001].

Measurement of D0- D ¯ 0 mixing and search for CP violation with D0 →k+π- decays

Anelli A.;Borsato M.;Calvi M.;Capelli S.;Cardini A.;Carniti P.;Fazzini D.;Garcia Pardinas J.;Gotti C.;Kirsebom V. S.;Malentacca L.;Martinazzoli L.;Martinelli M.;Minotti A.;Pizzichemi M.;Salomoni M.;
2025

Abstract

A measurement of the time-dependent ratio of the D0→K+π- to D¯0→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)+→D0π+ 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 RKπ=(343.1±2.0)×10-5. The mixing parameters are measured to be cKπ=(51.4±3.5)×10-4 and cKπ′=(13±4)×10-6, where RKπcKπ is the linear coefficient of the expansion of the ratio as a function of decay time in units of the D0 lifetime, and cKπ′ 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.
Articolo in rivista - Articolo scientifico
Physics
English
3-gen-2025
2025
111
1
012001
none
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2025). Measurement of D0- D ¯ 0 mixing and search for CP violation with D0 →k+π- decays. PHYSICAL REVIEW D, 111(1) [10.1103/PhysRevD.111.012001].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/549311
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