Measurement of the inclusive branching fraction for $\psi(3686)\rightarrow K_{S}^{0} + \text{anything}$

TL;DR

This paper measures the inclusive branching fraction of the $6$ decay to $K_{S}^{0}$ and anything, using electron-positron collision data at BESIII, providing a first-time measurement with detailed analysis.

Contribution

It presents the first measurement of the product of the $6$ leptonic width and its inclusive decay branching fraction to $K_{S}^{0}X$, using a fit to observed cross sections.

Findings

Measured $6$ decay branching fraction to $K_{S}^{0}X$ as (16.04 ± 0.29 ± 0.90)%

Determined the product of leptonic width and decay branching as (373.8 ± 6.7 ± 20.0) eV

First such measurement with detailed fit including initial state radiation and beam energy spread.

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 $e^+e^-\rightarrow K_{S}^{0} X$ (where $X= \text{anything}$). From a fit to these observed cross sections with the sum of continuum and $\psi(3686)$ and $J/\psi$ Breit-Wigner functions and considering initial state radiation and the BEPCII beam energy spread, we obtain for the first time the product of $\psi(3686)$ leptonic width and inclusive decay branching fraction $\Gamma^{ee}_{\psi(3686)}\mathcal B(\psi(3686)\rightarrow K_{S}^{0} X) = (373.8 \pm 6.7 \pm 20.0)$ eV, and assuming $\Gamma^{ee}_{\psi(3686)}$ is $(2.33 \pm 0.04)$ keV from PDG value, we measure $\mathcal B(\psi(3686)\rightarrow K_{S}^{0} X) = (16.04 \pm 0.29 \pm 0.90)\%$, where the first uncertainty is statistical and the second is systematic.