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D*Dπ and B*Bπ couplings from Dyson-Schwinger equations framework

Y.-Z. Xu1,2,* and K. Raya1,†

  • *Contact author: yinzhen.xu@dci.uhu.es
  • †Contact author: khepani.raya@dci.uhu.es
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Phys. Rev. D 112, 014046 – Published 31 July, 2025

DOI: https://doi.org/10.1103/vqff-f9pb

Abstract

Employing a unified Dyson-Schwinger/Bethe-Salpeter equations approach, we calculate the strong decay couplings D*Dπ and B*Bπ within the so-called impulse-approximation in the moving frame. The B*Bπ estimation is reported for the first time based on a Poincaré invariant computation of the associated Bethe-Salpeter amplitudes. Our predictions yield gD*Dπ=16.22−0.01+0.03 and gB*Bπ=40.09−1.37+1.51, along with corresponding static strong couplings of g^D=0.55−<0.01+<0.01, g^B=0.50−0.02+0.02, which are consistent with recent experimental and lattice data.

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Phys. Rev. D 112, 014046– Published 31 July, 2025
  • Received 8 May 2025
  • Accepted 8 July 2025
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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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