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Lattice QCD calculation of charmed baryon decay constants in the continuum limit and at physical mass

Lei-Yi Li1, Jie Ran1, Mengchu Cai2, Hao-Fei Gao1,3, Yu Gu4, Xue-Ying Han5,6, Jun Hua7,8, Jin-Xin Tan1,3, Guang-Yu Wang1,* et al.

Wei Wang1,†, Fanrong Xu4, Yi-Bo Yang9,2,10,11, and Qi-An Zhang12,‡

  • *Contact author: guangyuwang@sjtu.edu.cn
  • †Contact author: wei.wang@sjtu.edu.cn
  • ‡Contact author: zhangqa@buaa.edu.cn
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Phys. Rev. D 113, 054509 – Published 20 March, 2026

DOI: https://doi.org/10.1103/556x-5mgq

Abstract

We present the first principle calculation of charmed baryon decay constants employing 2+1 flavor gauge ensembles with lattice spacings ranging from 0.05 to 0.1 fm and pion masses between 136 and 310 MeV. Under SU(3) flavor symmetry, we construct the charmed baryon interpolating operators and compute the corresponding hadronic matrix elements to extract the bare decay constants for each ensemble. The nonperturbative renormalization is performed via the symmetric momentum-subtraction (SMOM) scheme. After performing systematic chiral and continuum extrapolations, we obtain the decay constants with a precision of 8%–16% from first principles. We further determine several ratios of decay constants among different charmed baryons, for which renormalization factors and part of the systematic uncertainties largely cancel, providing a cleaner probe of SU(3) flavor symmetry breaking. These ratios offer a quantitative, first-principles characterization of the SU(3)-breaking pattern in the charmed baryon sector.

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Phys. Rev. D 113, 054509– Published 20 March, 2026
  • Received 9 January 2026
  • Accepted 5 March 2026
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