Simultaneous Dalitz-plot decomposition of the e+ e- → J/ψ π π (K K̅) processes in the 4.13-4.36 GeV region using dispersive final-state interactions
Abstract
We present a joint analysis of the processes e+e- → J/ψπ+π- and e+e- → J/ψK+K- at center-of-mass energies from 4.13 to 4.36 GeV. The amplitudes are constructed using the Dalitz-plot decomposition formalism, with the e+e- energy dependence encoded through the Y(4220) and Y(4320) resonant structures together with a nonresonant production mechanism. The scalar ππ/KK̅ final-state interaction is treated dispersively using a coupled-channel Omnès representation. This allows us to describe the measured total cross sections and one-dimensional invariant-mass distributions with a single set of energy-independent parameters. We find that a purely resonant description of the BESIII data is insufficient, requiring a nonresonant term at the amplitude level which undergoes ππ/KK̅ rescattering. Within the present isobar model, we extract Breit-Wigner parameters for the Zc(3900), Y(4220), and Y(4320) states, and determine the corresponding subprocess cross sections.
Versions
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BibTeX
@misc{ermolina2026simultaneous,
title = {{Simultaneous Dalitz-plot decomposition of the $e^+ e^- \to J/ψ\, π\, π\, (K \barK)$ processes in the 4.13-4.36 GeV region using dispersive final-state interactions}},
author = {Viktoriia Ermolina and Igor Danilkin and Marc Vanderhaeghen},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.07225},
eprint = {2606.07225},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.07225},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Simultaneous Dalitz-plot decomposition of the e^+ e^- → J/ψ π π (K K̅) processes in the 4.13-4.36 GeV region using dispersive final-state interactions
AU - Viktoriia Ermolina
AU - Igor Danilkin
AU - Marc Vanderhaeghen
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2606.07225
UR - https://arxiv.org/abs/2606.07225
AB - We present a joint analysis of the processes e^+e^- → J/ψπ^+π^- and e^+e^- → J/ψK^+K^- at center-of-mass energies from 4.13 to 4.36 GeV. The amplitudes are constructed using the Dalitz-plot decomposition formalism, with the e^+e^- energy dependence encoded through the Y(4220) and Y(4320) resonant structures together with a nonresonant production mechanism. The scalar ππ/KK̅ final-state interaction is treated dispersively using a coupled-channel Omnès representation. This allows us to describe the measured total cross sections and one-dimensional invariant-mass distributions with a single set of energy-independent parameters. We find that a purely resonant description of the BESIII data is insufficient, requiring a nonresonant term at the amplitude level which undergoes ππ/KK̅ rescattering. Within the present isobar model, we extract Breit-Wigner parameters for the Z_c(3900), Y(4220), and Y(4320) states, and determine the corresponding subprocess cross sections.
ER -