Amplitude analysis and branching fraction measurement of $D_s^+ \to K^-K^+\pi^+\pi^0$

TL;DR

This paper presents the first amplitude analysis of the decay $D_s^+ o K^-K^+\pi^+\pi^0$, measuring its branching fraction and intermediate decay components using BESIII data.

Contribution

It provides the first detailed amplitude analysis and precise branching fraction measurement for this decay mode, identifying nine key intermediate components.

Findings

Branching fraction measured as (5.42 ± 0.10 (stat.) ± 0.17 (syst.))%.

Nine intermediate decay components identified.

Data sample of over 3000 events with 97.5% purity used.

Abstract

The first amplitude analysis of the decay $D_s^+\to K^-K^+\pi^+\pi^0$ is presented using the data samples, corresponding to an integrated luminosity of 6.32 fb$^{-1}$, collected with the BESIII detector at $e^+e^-$ center-of-mass energies between 4.178 and 4.226 GeV. More than 3000 events selected with a purity of 97.5\% are used to perform the amplitude analysis, and nine components are found necessary to describe the data. Relative fractions and phases of the intermediate decays are determined. With the detection efficiency estimated by the results of the amplitude analysis, the branching fraction of $D_s^+\to K^-K^+\pi^+\pi^0$ decay is measured to be $(5.42\pm0.10_{\rm stat.}\pm0.17_{\rm syst.})\%$.