Measurement of the branching fraction of the doubly Cabibbo-suppressed decay D⁰→ K⁺π^-π⁰ and search for D⁰→ K⁺π^-π⁰π⁰

2022/03/03 by BESIII Collaboration, M. Ablikim, M. N. Achasov +647
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2203.01555

openalex publication_date 2022/03/03 · openalex created_date 2022/04/03 · openalex updated_date 2026/07/28

Abstract

Using 2.93 \rm fb^-1 of e⁺e^- collision data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we present a measurement of the branching fraction of the doubly Cabibbo-suppressed (DCS) decay D⁰→ K⁺π^-π⁰ and a search for the DCS decay D⁰→ K⁺π^-π⁰π⁰. The branching fraction of D⁰→ K⁺π^-π⁰ is determined to be [3.13^+0.60_-0.56(\rm stat) ± 0.09(\rm syst)] × 10^-4. No signal is observed for D⁰→ K⁺π^-π⁰π⁰ and an upper limit of 3.6 × 10^-4 is set on the branching fraction at the 90% C.L. We combine these results with the world-average branching fractions of their counterpart Cabibbo-favored decays to determine the ratios of the doubly Cabibbo-suppressed over the Cabibbo-favored branching fractions, \mathcal B(D⁰→ K⁺π^-π⁰)/\mathcal B(D⁰→ K^-π⁺π⁰)=(0.22± 0.04)%~and \mathcal B(D⁰→ K⁺π^-π⁰π⁰)/\mathcal B(D⁰→ K^-π⁺π⁰π⁰)<0.40% at the 90% C.L., which correspond to (0.75± 0.14)tan⁴ θ_C~and 1.37× tan⁴ θ_C, respectively, where θ_C is the Cabibbo angle.

Related

• Measurement of the branching fractions of doubly Cabibbo-suppressed D decays
• Amplitude analysis and branching fraction measurement of the Cabibbo-favored decay D⁺ → K^-π⁺π⁺π⁰
• Measurements of the absolute branching fractions of the doubly Cabibbo-suppressed decays D⁺→ K⁺π⁰, D⁺→ K⁺η and D⁺→ K⁺η^′
• Measurement of the doubly Cabibbo-suppressed decay D⁺→ K⁺π⁺π^-π⁰ with semileptonic tags
• Branching Fraction for the Doubly-Cabibbo-Suppressed Decay D⁺ to K^_ pi⁰