Semileptonic Decays of Heavy Vector Mesons in Hard-Wall AdS/QCD with N_f=5

Abstract

We present a systematic study of semileptonic decays of heavy vector mesons within the Hard-Wall AdS/QCD framework. Semileptonic decays provide a clean environment for testing the Standard Model because the leptonic current is well understood, while the hadronic part is encoded in transition form factors that reflect non-perturbative QCD dynamics. The processes under consideration include: ψ→ D^*− ( D⁻ ) ℓ⁺ ν_ℓ, D^*0 → π⁻ ℓ⁺ ν_ℓ, D^*+_s → K⁰ ℓ⁺ ν_ℓ, D^*0 → ρ⁻ ℓ⁺ ν_ℓ, B_c^*+ → B^*0 ℓ⁺ ν_ℓ, B_c^*+ → ψ ℓ⁺ ν_ℓ, B^*− → D^*0 ℓ⁻ ν̅_ℓ, B^*0 → D^*+(D⁺) ℓ⁻ ν̅_ℓ, B^*0_s → D^*+_s (D⁺_s) ℓ⁻ ν̅_ℓ, ψ→ D^*−_s(D⁻_s) ℓ⁺ ν_ℓ, D^*0 → K^*− (K⁻) ℓ⁺ ν_ℓ, B_c^*− → D^*0 ℓ⁻ ν̅_ℓ, B_s̅^*0 → K^*+ ℓ⁻ ν̅_ℓ, and B̅^*0 → ρ⁺ ℓ⁻ ν̅_ℓ. These decays correspond to four different quark-level transitions: c→ d, b→ c, c→ s, and b→ u, allowing us to explore a broad range of flavor dynamics.\\ Using the Hard-Wall AdS/QCD model, we compute the relevant transition form factors as functions of the momentum transfer q². The framework provides analytic expressions for meson wave functions and decay constants, which serve as inputs for the form-factor calculations. From these form factors, we evaluate the differential and integrated branching ratios for each decay mode. Where possible, we compare our predictions with results obtained from other non-perturbative approaches.

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BibTeX RIS

BibTeX

@misc{momeni2026semileptonic,
  title = {{Semileptonic Decays of Heavy Vector Mesons in Hard-Wall AdS/QCD with $N_f=5$}},
  author = {S. Momeni and M. Saghebfar and A. Ranjbar},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.26040},
  eprint = {2609.26040},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.26040},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Semileptonic Decays of Heavy Vector Mesons in Hard-Wall AdS/QCD with N_f=5
AU  - S. Momeni
AU  - M. Saghebfar
AU  - A. Ranjbar
PY  - 2026
DA  - 2026/09/22
PB  - arXiv
DO  - 10.48550/arxiv.2609.26040
UR  - https://arxiv.org/abs/2609.26040
AB  - We present a systematic study of semileptonic decays of heavy vector mesons within the Hard-Wall AdS/QCD framework. Semileptonic decays provide a clean environment for testing the Standard Model because the leptonic current is well understood, while the hadronic part is encoded in transition form factors that reflect non-perturbative QCD dynamics. The processes under consideration include: ψ→ D^*− ( D^− ) ℓ^+ ν_ℓ, D^*0 → π^− ℓ^+ ν_ℓ, D^*+_s → K^0 ℓ^+ ν_ℓ, D^*0 → ρ^− ℓ^+ ν_ℓ, B_c^*+ → B^*0 ℓ^+ ν_ℓ, B_c^*+ → ψ ℓ^+ ν_ℓ, B^*− → D^*0 ℓ^− ν̅_ℓ, B^*0 → D^*+(D^+) ℓ^− ν̅_ℓ, B^*0_s → D^*+_s (D^+_s) ℓ^− ν̅_ℓ, ψ→ D^*−_s(D^−_s) ℓ^+ ν_ℓ, D^*0 → K^*− (K^−) ℓ^+ ν_ℓ, B_c^*− → D^*0 ℓ^− ν̅_ℓ, B_s̅^*0 → K^*+ ℓ^− ν̅_ℓ, and B̅^*0 → ρ^+ ℓ^− ν̅_ℓ. These decays correspond to four different quark-level transitions: c→ d, b→ c, c→ s, and b→ u, allowing us to explore a broad range of flavor dynamics.\\ Using the Hard-Wall AdS/QCD model, we compute the relevant transition form factors as functions of the momentum transfer q^2. The framework provides analytic expressions for meson wave functions and decay constants, which serve as inputs for the form-factor calculations. From these form factors, we evaluate the differential and integrated branching ratios for each decay mode. Where possible, we compare our predictions with results obtained from other non-perturbative approaches.
ER  -

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