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  • Open Access

Study of electron-positron annihilation into four pions within chiral effective field theory in the low energy region

Jia-Yu Zhou, Hao-Xiang Pan, and Ling-Yun Dai*

  • School for Theoretical Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China and Hunan Provincial Key Laboratory of High-Energy Scale Physics and Applications, Hunan University, Changsha 410082, People’s Republic of China

  • *Contact author: dailingyun@hnu.edu.cn

Phys. Rev. D 113, 054029 – Published 20 March, 2026

DOI: https://doi.org/10.1103/f9xp-k4y2

Abstract

In this paper, we employ chiral effective field theory to study the process of electron-positron annihilation into four pions in the low energy region within Ec.m.≤0.6  GeV. The prediction of the cross section is obtained through SU(3) chiral perturbation theory up to the next-to-leading order, which is smaller than the experimental data in the energy region [0.6–0.65] GeV, though the data has only a few points and poor statistics. Then, the resonance chiral theory is applied to include the resonance contribution, with the lightest scalars and vectors written in the effective Lagrangians. A series of relevant decay widths and the masses of the vectors are studied to fix the unknown couplings. The resonance contribution should be one order larger than that of the chiral perturbation theory but still one to two orders smaller than the data. The significant discrepancy urged the new experimental measurements to give more guidance. We also compute the leading order hadronic vacuum polarization contribution from the four pion channels to the anomalous magnetic moment of the muon, (g−2)μ. In the energy range from threshold up to 0.6 GeV within resonance chiral theory, the contributions are aμ=(0.680±0.062)×10−16 and aμ=(0.597±0.058)×10−16 for the processes of e+e−→π+π+π−π−, π0π0π+π−, respectively.

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