Measurement of the branching fractions of doubly Cabibbo-suppressed D decays

2025/03/25 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +653
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2503.19542

Abstract

By analyzing e⁺e^- collision data collected at the center-of-mass energy of 3.773~GeV with the BESIII detector, corresponding to an integrated luminosity of 20.3~fb^-1, we measure the branching fractions of the doubly Cabibbo-suppressed (DCS) decays D⁰→ K⁺π^-, D⁰→ K⁺π^-π^-π⁺, D⁰→ K⁺π^-π⁰, D⁰→ K⁺π^-π⁰π⁰, D⁺→ K⁺π⁺π^-, and D⁺→ K⁺K⁺K^-. We also perform the first searches for D⁰→ K⁺π^-η, D⁰→ K⁺π^-π⁰η, D⁺→ K⁺π⁺π^-η, D⁺ → K⁺ (π⁺ π^- η)_\rm non-η^′, and D⁺→ K⁺ηη and report the first observations and evidence for some of these final states. Combining the measurements with the world averages of the corresponding Cabibbo-favored (CF) decays, the ratios of the DCS/CF branching fractions are obtained. For the D⁺ → K⁺ (π⁺ π^- η)_\rm non-η^′ decay, the ratio is significantly larger than the corresponding ratios of the other DCS decays.

Related

• Measurement of the branching fraction of the doubly Cabibbo-suppressed decay D⁰→ K⁺π^-π⁰ and search for D⁰→ K⁺π^-π⁰π⁰
• Measurements of the absolute branching fractions of the doubly Cabibbo-suppressed decays D⁺→ K⁺π⁰, D⁺→ K⁺η and D⁺→ K⁺η^′
• Amplitude analysis and branching fraction measurement of the Cabibbo-favored decay D⁺ → K^-π⁺π⁺π⁰
• Measurement of the doubly Cabibbo-suppressed decay D⁺→ K⁺π⁺π^-π⁰ with semileptonic tags
• Observation of SCS decay D^+,0→ωπ and branching fraction measurement of D⁰→ K_S⁰K⁺K^-