Observation of an ${a}_{0}$-like State with Mass of 1.817 GeV in the Study of ${D}_{s}^{+}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{+}{\ensuremath{\pi}}^{0}$ Decays

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Observation of an $a_{0}$ -like State with Mass of 1.817 GeV in the Study of $D_{s}^{+} \to K_{S}^{0} K^{+} π^{0}$ Decays

M. Ablikim et al. (BESIII Collaboration)

Phys. Rev. Lett. 129, 182001 – Published 28 October 2022

Abstract

Using $e^{+} e^{-}$ annihilation data corresponding to an integrated luminosity of $6.32 {fb}^{- 1}$ collected at center-of-mass energies between 4.178 and 4.226 GeV with the BESIII detector, we perform the first amplitude analysis of the decay $D_{s}^{+} \to K_{S}^{0} K^{+} π^{0}$ and determine the relative branching fractions and phases for intermediate processes. We observe an $a_{0}$ -like state with mass of 1.817 GeV in its decay to $K_{S}^{0} K^{+}$ for the first time. In addition, we measure the ratio ${B [D_{s}^{+} \to {\bar{K}}^{*} (892)^{0} K^{+}] / B [D_{s}^{+} \to {\bar{K}}^{0} K^{*} (892)^{+}]}$ to be ${2.35}_{- 0.23 stat}^{+ 0.42} \pm 0.1 0_{syst}$ . Finally, we provide a precision measurement of the absolute branching fraction $B (D_{s}^{+} \to K_{S}^{0} K^{+} π^{0}) = (1.46 \pm 0.0 6_{stat} \pm 0.0 5_{syst}) %$ .

Received 24 April 2022
Revised 8 July 2022
Accepted 13 September 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.182001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society