## Abstract

Using 5.9 pb^{−1} of e^{+}e^{−} annihilation data collected at center-of-mass energies from 3.640 to 3.701 GeV with the BESIII detector at the BEPCII Collider, we measure the observed cross sections of e^{+}e^{−}→K_{S}^{0}X (where X=anything). From a fit to these observed cross sections with the sum of continuum and ψ(3686) and J/ψ Breit-Wigner functions and considering initial state radiation and the BEPCII beam energy spread, we obtain for the first time the product of ψ(3686) leptonic width and inclusive decay branching fraction Γ_{ψ(3686)}^{ee}B(ψ(3686)→K_{S}^{0}X)=(373.8±6.7±20.0) eV, and assuming Γ_{ψ(3686)}^{ee} is (2.33±0.04) keV from PDG value, we measure B(ψ(3686)→K_{S}^{0}X)=(16.04±0.29±0.90)%, where the first uncertainty is statistical and the second is systematic.

Original language | English (US) |
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Article number | 136576 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 820 |

DOIs | |

State | Published - Sep 10 2021 |

### Bibliographical note

Publisher Copyright:© 2021 The Author(s)

## Keywords

- BESIII
- Inclusive branching fraction
- K
- ψ(3686)

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