Measurement of the doubly Cabibbo-suppressed decay D⁺→ K⁺π⁺π^-π⁰ with semileptonic tags

2021/05/29 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +500
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2105.14310

Abstract

Using an e⁺e^- annihilation data sample corresponding to an integrated luminosity of 2.93 \rm fb^-1 collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, the doubly Cabibbo-suppressed decay D⁺→ K⁺π⁺π^-π⁰ is studied with a semileptonic tag method. After removing the decays containing narrow intermediate resonances, D⁺→ K⁺η, D⁺→ K⁺ω, and D⁺→ K⁺ϕ, the branching fraction for the decay D⁺→ K⁺π⁺π^-π⁰ is determined to be (1.03 ± 0.12_{\rm stat} ± 0.06_{\rm syst})× 10^-3. The ratio of the branching fraction for D⁺→ K⁺π⁺π^-π⁰ to its Cabibbo-favored counterpart D⁺→ K^-π⁺π⁺π⁰ is measured to be (1.65±0.21)%, corresponding to (5.73±0.73)tan⁴θ_C, where θ_C is the Cabibbo mixing angle. These results are consistent with our previous measurement with hadronic tags but are significantly larger than other doubly Cabibbo-suppressed decays in the charm sector.

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