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Electromagnetic polarizabilities of the triplet hadrons in heavy hadron chiral perturbation theory

Hao Dang1,*, Liang-Zhen Wen1,†, Yan-Ke Chen2,‡, and Shi-Lin Zhu2,§

  • *Contact author: haodang@stu.pku.edu.cn
  • †Contact author: wenlzh_hep-th@stu.pku.edu.cn
  • ‡Contact author: chenyanke@pku.edu.cn
  • §Contact author: zhusl@pku.edu.cn
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Phys. Rev. D 113, 094007 – Published 5 May, 2026

DOI: https://doi.org/10.1103/dlbl-1t6v

Abstract

We investigate the electromagnetic polarizabilities of singly heavy mesons and doubly heavy baryons within the framework of heavy hadron chiral perturbation theory up to O(p3). We estimate the low-energy constants using the nonrelativistic constituent quark model. A striking prediction of our study is the giant electric polarizabilities of the D* mesons: αE(D¯*0)≈294×10−4  fm3 and αE(D*−)≈1.42–64.5i×10−4  fm3. These anomalously large values arise from the near-degenerate mass between D* and Dπ, which are orders of magnitude larger than those of their bottom counterparts. This kinematic coincidence induces a pronounced cusp structure in the chiral loops, reflecting the long-range dynamics of a pion cloud. For doubly heavy baryons, polarizabilities depend strongly on heavy-flavor composition: the bcq system differs markedly from ccq and bbq due to mixing with scalar heavy-diquark states. Using heavy diquark–antiquark symmetry (HDAS), we unify the chiral dynamics of singly heavy mesons and doubly heavy baryons in the heavy-quark limit. The pion-loop contributions dominate the electromagnetic structure of heavy hadrons and provide essential benchmarks for future lattice QCD simulations.

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Phys. Rev. D 113, 094007– Published 5 May, 2026
  • Received 8 February 2026
  • Accepted 6 April 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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