Branching Fractions and CP-Violating Asymmetries in D => PP Decays

Abstract

We update an SU(3)_F analysis of D→ PP decays (P≡ π, K) in which the dominant SU(3)_F-breaking effects are modeled through final-state interactions. The new fit improves the description relative to the previous parameter set, although significant global tension remains, mainly in charged-D modes. Within the adopted rescattering model, the direct CP asymmetries in D⁰→π⁺π^-, K⁺K^-, π⁰π⁰, and K_S⁰ K_S⁰ depend on two additional reduced amplitudes. Using the D⁰→π⁺π^- and D⁰→ K⁺K^- asymmetries as inputs, we derive conditional predictions for the two neutral modes. The OZI-motivated benchmark Δ₄=0 is mildly disfavored by the charged-mode asymmetries and leads to substantially smaller asymmetries in the neutral modes, which can be tested with more precise K_S⁰K_S⁰ and π⁰π⁰ measurements.

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BibTeX RIS

BibTeX

@misc{buccella2026branching,
  title = {{Branching Fractions and CP-Violating Asymmetries in D => PP Decays}},
  author = {Franco Buccella and Pietro Santorelli},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.04014},
  eprint = {2611.04014},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.04014},
}

RIS

TY  - UNPB
TI  - Branching Fractions and CP-Violating Asymmetries in D => PP Decays
AU  - Franco Buccella
AU  - Pietro Santorelli
PY  - 2026
DA  - 2026/11/02
PB  - arXiv
DO  - 10.48550/arxiv.2611.04014
UR  - https://arxiv.org/abs/2611.04014
AB  - We update an SU(3)_F analysis of D→ PP decays (P≡ π, K) in which the dominant SU(3)_F-breaking effects are modeled through final-state interactions. The new fit improves the description relative to the previous parameter set, although significant global tension remains, mainly in charged-D modes. Within the adopted rescattering model, the direct CP asymmetries in D^0→π^+π^-, K^+K^-, π^0π^0, and K_S^0 K_S^0 depend on two additional reduced amplitudes. Using the D^0→π^+π^- and D^0→ K^+K^- asymmetries as inputs, we derive conditional predictions for the two neutral modes. The OZI-motivated benchmark Δ_4=0 is mildly disfavored by the charged-mode asymmetries and leads to substantially smaller asymmetries in the neutral modes, which can be tested with more precise K_S^0K_S^0 and π^0π^0 measurements.
ER  -

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