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.
Highlights
The charmoniumlike state Yð4260Þ was first observed in the initial state radiation (ISR) process, eþe− → γISRπþπ−J=ψ, by BABAR [1], and later confirmed by the
Signal MC samples of eþe− → K0SKþπ− are generated with phase space (PHSP) distributions with EVTGEN [22,23], which includes ISR effects [24]
The known decay modes of the charmonium states are produced with EVTGEN [22,23] according to the world average branching fraction (BF) values from the Particle Data Group (PDG) [25], while the unknown decay modes are generated with the LUNDCHARM generator [26]
Summary
The charmoniumlike state Yð4260Þ was first observed in the initial state radiation (ISR) process, eþe− → γISRπþπ−J=ψ, by BABAR [1], and later confirmed by the. BESIII reported a precise measurement of the eþe− → πþπ−J=ψ cross sections in the center-of-mass (c.m.) energy region from 3.77 to 4.60 GeV [5], where it found the Yð4260Þ to have a mass of ð4222.0 Æ 3.1 Æ. The BABAR collaboration has measured the cross section of eþe− → K0SKpÆπffiffi∓ [16] with the ISR process and found an excess around s 1⁄4 4.2 GeV, which is very close to the ψð4160Þ and Yð4220=4260Þ. Analyzing this process with a larger data sample provides higher precision and more information on Yð4220=4260Þ decays to light hadrons.
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