Precision measurements of $\sigma_{B}(e^+e^- \to K_{S}^{0}K^{\pm}\pi^{\mp})$ at center-of-mass energies between 3.8 and 4.6 GeV

TL;DR

This paper reports precise measurements of the cross section for the process e+e- to K0s K+- pi-+ in the 3.8 to 4.6 GeV energy range, revealing a possible resonance near 4.2 GeV.

Contribution

First high-precision measurement of the e+e- to K0s K+- pi-+ cross section in this energy range, with evidence for a resonance near 4.2 GeV.

Findings

Results agree with previous measurements but with higher precision.

Cross sections can be modeled with a simple 1/s^n dependence.

Data suggests a resonance near 4.2 GeV, indicating possible new states.

Abstract

Using data samples collected by the BESIII detector operating at the BEPCII storage ring, we measure the $e^+e^- \to K_{S}^{0}K^{\pm}\pi^{\mp}$ Born cross sections at center-of-mass energies between 3.8 and 4.6\,GeV, corresponding to a luminosity of about 5.0~fb$^{-1}$. The results are compatible with the BABAR measurements, but with the precision significantly improved. A simple $1/s^n$ dependence for the continuum process can describe the measured cross sections, but a better fit is obtained by an additional resonance near 4.2\,GeV, which could be an excited charmonium or a charmonium-like state.