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Transition form factors for D/B to a0(980) from light-cone QCD sum rules

Di Gao1,2,*, JiangShan Lan2,4,5,†, Duojie Jia3,6,‡, Xingbo Zhao2,4,5,§, and Yanjun Sun1,6,∥

  • *Contact author: digao@impcas.ac.cn
  • †Contact author: jiangshanlan@impcas.ac.cn
  • ‡Contact author: jiadj@nwnu.edu.cn
  • §Contact author: xbzhao@impcas.ac.cn
  • ∥Contact author: sunyanjun@nwnu.edu.cn
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Phys. Rev. D 113, 053009 – Published 27 March, 2026

DOI: https://doi.org/10.1103/ccsy-x7sj

Abstract

We apply the light-cone QCD sum rules with chiral currents to compute transition form factors of the semileptonic decay of the charmed and bottom scalar mesons D/B to a0(980)l+νl (l=e,μ), where the scalar meson a0(980) are firstly regarded as two quark states, and contributions from the tetraquark component are then added via proper modulation of four distribution amplitudes considered. The obtained transition form factors and branching fraction are free of the contribution from the light-cone distribution amplitudes at the level of twist-three and two simple relations connecting their form factors are obtained. Our computations indicates that the decay branch fractions are on the margin of the measurements reported by the Beijing Spectrometer III in the pure two-quark scenario and are in good agreement with observations when tetraquark component is considered.

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Phys. Rev. D 113, 053009– Published 27 March, 2026
  • Received 18 July 2025
  • Accepted 16 January 2026
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