Measurements of the strong-phase difference between D0 and D ̄ 0 → πþπ−πþπ− are performed in bins of phase space. The study exploits a sample of quantum-correlated DD ̄ mesons collected by the BESIII experiment in eþe− collisions at a center-of-mass energy of 3.773 GeV, corresponding to an integrated luminosity of 2.93 fb−1. Here, D denotes a neutral charm meson in a superposition of flavor eigenstates. The reported results are valuable for measurements of the CP-violating phase γ (also denoted φ3) in B → DK, D → πþπ−πþπ− decays, and the binning schemes are designed to provide good statistical sensitivity to this parameter. The expected uncertainty on γ arising from the precision of the strong-phase measurements, when applied to very large samples of B-meson decays, is around 1.5° or 2°, depending on the binning scheme. The binned strong-phase parameters are combined to give a value of F4π 1⁄4 þ 0.746  0.010  0.004 for the CP-even fraction of D0 → πþπ−πþπ− decays, which is around 30% more precise than the previous best measurement of this quantity.
Model-independent determination of the strong-phase difference between D0 and D ̄0 →π+π−π+π− decays
Garzia, I.;
2024
Abstract
Measurements of the strong-phase difference between D0 and D ̄ 0 → πþπ−πþπ− are performed in bins of phase space. The study exploits a sample of quantum-correlated DD ̄ mesons collected by the BESIII experiment in eþe− collisions at a center-of-mass energy of 3.773 GeV, corresponding to an integrated luminosity of 2.93 fb−1. Here, D denotes a neutral charm meson in a superposition of flavor eigenstates. The reported results are valuable for measurements of the CP-violating phase γ (also denoted φ3) in B → DK, D → πþπ−πþπ− decays, and the binning schemes are designed to provide good statistical sensitivity to this parameter. The expected uncertainty on γ arising from the precision of the strong-phase measurements, when applied to very large samples of B-meson decays, is around 1.5° or 2°, depending on the binning scheme. The binned strong-phase parameters are combined to give a value of F4π 1⁄4 þ 0.746 0.010 0.004 for the CP-even fraction of D0 → πþπ−πþπ− decays, which is around 30% more precise than the previous best measurement of this quantity.| File | Dimensione | Formato | |
|---|---|---|---|
|
PhysRevD.110.112008.pdf
accesso aperto
Tipologia:
Full text (versione editoriale)
Licenza:
Creative commons
Dimensione
631.83 kB
Formato
Adobe PDF
|
631.83 kB | Adobe PDF | Visualizza/Apri |
I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


