Amplitude analysis of B⁰ → η_c(1S) K⁺ π^- decays

2025/09/03 by LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +2372 · 2 voices
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex

paper · pdf · doi:10.48550/arxiv.2509.03133

arxiv published 2025/09/03 · arxiv updated 2026/05/19

Abstract

An amplitude analysis of the B⁰ → η_c(1S) K⁺ π^- decays with η_c(1S) → p p is performed using a sample corresponding to an integrated luminosity of 9fb^-1 of pp collision data collected by the LHCb detector at centre-of-mass energies of √(s) = 7, 8 and 13TeV. The data are described with a model including only intermediate contributions from known K^0⋆ resonances. Evidence for an exotic resonance in the η_c(1S) π^- system, reported in a previous analysis of this decay channel, is not confirmed. The inclusive branching fraction of the B⁰ → η_c(1S) K⁺ π^- decays is measured to be B(B⁰ → η_c(1S) K⁺ π^- ) = (5.82 ± 0.20 ± 0.23 ± 0.55) × 10^-4, where the first uncertainty is statistical, the second systematic, and the third arises from the limited knowledge of external branching fractions.

Citations

• JFIT: a framework to obtain combined experimental results through joint fits
• Geant4 developments and applications
• The RooFit toolkit for data modeling

Discussions

• Amplitude analysis of B⁰→ηc(1S)K⁺π⁻ decays arxiv.org/abs/2509.03133 - The data are described with a model including only intermediate contributions from known K*⁰ resonances. Evidence for an exotic re [bsky, 2 points, 0 comments]
• #LHCbpaper: Amplitude analysis of B⁰ → η_c(1S) K⁺ π⁻ decays (arXiv:2509.03133) https://arxiv.org/abs/2509.03133 [bsky, 1 points, 0 comments]

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