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.
2024
Ablikim, M.; Achasov, M.  n.; Adlarson, P.; Afedulidis, O.; Ai, X.  c.; Aliberti, R.; Amoroso, A.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2597294
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