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PreprintarXiv licencearXiv

Study of the up-down asymmetry in B+→ K+π+π-γ using K1(1270) amplitudes constrained by semileptonic D Decays

  • Yijia Zeng
  • Hailong Ma
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Abstract

Using K1(1270)→ Kππ amplitude models constrained by the charmed-meson semileptonic decays D+(0)→ K-π+π0(−) e+νe, we present a model-dependent estimate of the up-down asymmetry observed in B+→ K+π+π-γ in the mass region MK+π+π-∈[1.1,1.3]~GeV/c2. Estimates based on an isolated K1(1270) show significant model dependence, but systematically lie below the measured asymmetry ℋ̅ud=(0.092±0.023) when assuming λγ=1. We also explore interference with the K1(1400) tail and find that it can appreciably reduce the tension.

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Cite

BibTeXRIS
BibTeX
@misc{zeng2026study,
  title = {{Study of the up-down asymmetry in $B^+\to K^+π^+π^-γ$ using $K_1(1270)$ amplitudes constrained by semileptonic $D$ Decays}},
  author = {Yijia Zeng and Hailong Ma},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.03035},
  eprint = {2611.03035},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.03035},
}
RIS
TY  - UNPB
TI  - Study of the up-down asymmetry in B^+→ K^+π^+π^-γ using K_1(1270) amplitudes constrained by semileptonic D Decays
AU  - Yijia Zeng
AU  - Hailong Ma
PY  - 2026
DA  - 2026/11/02
PB  - arXiv
DO  - 10.48550/arxiv.2611.03035
UR  - https://arxiv.org/abs/2611.03035
AB  - Using K_1(1270)→ Kππ amplitude models constrained by the charmed-meson semileptonic decays D^+(0)→ K^-π^+π^0(−) e^+ν_e, we present a model-dependent estimate of the up-down asymmetry observed in B^+→ K^+π^+π^-γ in the mass region M_K^+π^+π^-∈[1.1,1.3]~GeV/c^2. Estimates based on an isolated K_1(1270) show significant model dependence, but systematically lie below the measured asymmetry ℋ̅_ud=(0.092±0.023) when assuming λ_γ=1. We also explore interference with the K_1(1400) tail and find that it can appreciably reduce the tension.
ER  -