Form factors and weak decays of Λb→Λc*(2595) and Ξb→Ξc*(2790)
Abstract
In this article, we reanalyze the mass and pole residue of Λ-type singly heavy baryons with spin-parity JP=1/2± using two-point QCD sum rules. Then, we investigate the electroweak transition form factors of Λb→Λ*c(2595) and Ξb→Ξ*c(2790) within the framework of three-point QCD sum rules. At the hadron side, all possible couplings of the interpolating currents to hadronic states are taken into account, while at the QCD side, both the perturbative part and vacuum condensate contributions up to dimension-8 are included. Using the obtained form factors, we calculate the decay widths and branching ratios for the semileptonic decays Λb→Λ*c(2595)ℓν̅ℓ and Ξb→Ξ*c(2790)ℓν̅ℓ (ℓ=e,μ and τ), as well as for the corresponding nonleptonic decays Λb→Λ*c(2595)π[ρ], Λb→Λ*c(2595)K[K*], Ξb→Ξ*c(2790)π[ρ] and Ξb→Ξ*c(2790)K[K*]. Our estimates for the branching ratios of Λb→Λ*c(2595)ℓν̅ℓ are comparable with the experimental data and other theoretical results. These results can provide valuable references for future measurements. In addition, we present predictions for several observables in these semileptonic decays, including the lepton universality ratio, the forward-backward asymmetry AFB, and the asymmetry parameter α, which can provide useful references for future experiments to test the Standard Model and probe new physics beyond it.
Related
- Three-loop QCD corrections to heavy-to-light form factors and applications to inclusive B decays
- Holographic Calculation of Semileptonic Form Factors and the Isgur--Wise Function for B(s)→ D(s) Decays
- The form factors of transition process ℬQ1Q2(1/2+)→ℬQ1*(3/2+) and their applications to semileptonic decays
- Study of form factors and observables in Bc−→ Ds∗ −ℓ+ℓ− and Bc−→ Ds∗ −ν ν̅ decays
- Parton-shower and fixed-order QCD effects in Higgs boson production in weak-boson fusion and its decays to bottom quarks
BibTeX
@misc{lu2026form,
title = {{Form factors and weak decays of $Λ_b\toΛ_c^*(2595)$ and $Ξ_b\toΞ_c^*(2790)$}},
author = {Jie Lu and Dian-Yong Chen and Guo-Liang Yu and Zhi-Gang Wang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.28137},
eprint = {2610.28137},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.28137},
}
RIS
TY - UNPB
TI - Form factors and weak decays of Λ_b→Λ_c^*(2595) and Ξ_b→Ξ_c^*(2790)
AU - Jie Lu
AU - Dian-Yong Chen
AU - Guo-Liang Yu
AU - Zhi-Gang Wang
PY - 2026
DA - 2026/10/23
PB - arXiv
DO - 10.48550/arxiv.2610.28137
UR - https://arxiv.org/abs/2610.28137
AB - In this article, we reanalyze the mass and pole residue of Λ-type singly heavy baryons with spin-parity J^P=1/2^± using two-point QCD sum rules. Then, we investigate the electroweak transition form factors of Λ_b→Λ^*_c(2595) and Ξ_b→Ξ^*_c(2790) within the framework of three-point QCD sum rules. At the hadron side, all possible couplings of the interpolating currents to hadronic states are taken into account, while at the QCD side, both the perturbative part and vacuum condensate contributions up to dimension-8 are included. Using the obtained form factors, we calculate the decay widths and branching ratios for the semileptonic decays Λ_b→Λ^*_c(2595)ℓν̅_ℓ and Ξ_b→Ξ^*_c(2790)ℓν̅_ℓ (ℓ=e,μ and τ), as well as for the corresponding nonleptonic decays Λ_b→Λ^*_c(2595)π[ρ], Λ_b→Λ^*_c(2595)K[K^*], Ξ_b→Ξ^*_c(2790)π[ρ] and Ξ_b→Ξ^*_c(2790)K[K^*]. Our estimates for the branching ratios of Λ_b→Λ^*_c(2595)ℓν̅_ℓ are comparable with the experimental data and other theoretical results. These results can provide valuable references for future measurements. In addition, we present predictions for several observables in these semileptonic decays, including the lepton universality ratio, the forward-backward asymmetry A_FB, and the asymmetry parameter α, which can provide useful references for future experiments to test the Standard Model and probe new physics beyond it.
ER -