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arxiv: 1712.08326 · v2 · submitted 2017-12-22 · ✦ hep-ph · hep-ex

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Unbinned model-independent measurements with coherent admixtures of multibody neutral D meson decays

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classification ✦ hep-ph hep-ex
keywords decaysanglecoherentdecaydeterminationmeasurementsmodel-independentoverline
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Various studies of Standard Model parameters involve measuring the properties of a coherent admixture of $D^0$ and $\overline{D}^0$ states. A typical example is the determination of the Unitarity Triangle angle $\gamma$ in the decays $B\to DK$, $D\to K_S^0\pi^+\pi^-$. A model-independent approach to perform this measurement is proposed that has superior statistical sensitivity than the well-established method involving binning of the $D\to K_S^0\pi^+\pi^-$ decay phase space. The technique employs Fourier analysis of the complex phase difference between $D^0$ and $\overline{D}^0$ decay amplitudes and can be easily generalised to other similar measurements, such as studies of charm mixing or determination of the angle $\beta$ from $B^0\to D h^0$ decays.

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Cited by 3 Pith papers

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  1. Unbinned extraction of $\gamma$ from $B\to DK$ with normalizing flows

    hep-ph 2026-05 unverdicted novelty 7.0

    Normalizing flows trained on D decay data create a continuous unbinned model of Dalitz plot amplitudes, allowing extraction of gamma from B decay data with successful recovery of injected values in Monte Carlo tests.

  2. Precise measurement of the CKM angle $\gamma$ with a novel approach

    hep-ex 2026-04 unverdicted novelty 7.0

    A joint fit to LHCb B to D h decays and BESIII quantum-correlated D Dbar data yields gamma = 71.3 plus or minus 5.0 degrees, the most precise measurement to date.

  3. Measurement of the CKM angle $\gamma$ in $B^{\pm} \rightarrow D(\rightarrow K^{0}_{\rm S} h^{\prime+}h^{\prime-})h^{\pm}$ decays with a novel approach

    hep-ex 2026-04 unverdicted novelty 7.0

    A novel model-independent approach with per-event phase-space weights on combined BESIII and LHCb data measures the CKM angle γ as (71.3 ± 5.0)° in B± → D(→ K0S h'+h'-) h± decays.