First measurement of the cross sections for e⁺e^-→ K⁰K^-π⁺J/ψ+c.c. at √(s) from 4.396 to 4.951 GeV

2025/10/15 by BESIII Collaboration, Ablikim, M., M. N. Achasov +791
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2510.13274

openalex publication_date 2025/10/15 · openalex created_date 2025/10/17 · openalex updated_date 2026/07/28

Abstract

Using e⁺e^- collision data at 19 center-of-mass energies ranging from 4.396 to 4.951~GeV corresponding to a total integrated luminosity of 8.86~\rm fb^-1 collected by the BESIII detector, the process e⁺e^-→ K⁰K^-π⁺ J/ψ+c.c. is observed for the first time, with a statistical significance of 9.4σ summing up all the data samples. For this process, the cross section and the upper limit at the 90% confidence level are reported at each of the 19 center-of-mass energies.~No statistically significant vector structures are observed in the cross section line shape, nor are any intermediate states of Kπ, KK, KKπ, KJ/ψ, πJ/ψ, and KπJ/ψ seen at individual energy points or in the combined data sample.

Citations

• The new resonances Z_cs(3985) and Z_cs(4003) (almost) fill two tetraquark nonets of broken SU(3)_f
• An Iterative Weighting Method to Apply ISR Correction to e⁺e^- Hadronic Cross-section Measurements
• Heavy K^*(4307) meson with hidden charm
• Charmonium spectroscopy motivated by general features of pNRQCD
• Pentaquark and Tetraquark States
• Strong decays of higher charmonium states into open-charm meson pairs
• Hadronic molecules
• Sensitivity of searches for new signals and its optimization
• Coherent Exclusive Exponentiation for Precision Monte Carlo Calculations of Fermion Pair Production / Precision Predictions for (Un)stable W+W- Pairs
• The precision Monte Carlo event generator for two-fermion final states in collisions

Related

• Measurement of e⁺e^-→ϕπ⁺π^- cross sections at center-of-mass energies from 2.00 to 3.08 GeV
• Measurement of the e⁺e^-→ωπ⁰π⁰ cross section at center-of-mass energies from 2.0 to 3.08 GeV
• Measurement of the e⁺e^-→ p pπ⁰ cross section at √(s)=2.1000-3.0800 GeV
• Measurement of the e⁺e^-→π⁺π^-π⁰ cross section from 0.7 GeV to 3.0 GeV via initial-state radiation
• Measurement of the Born cross section for e⁺e^- → p K^- K^- Ξ⁺ at √(s) = 3.5-4.9 GeV