New Predictions for the Lifetimes of Doubly Heavy Baryons and the $B_c$ Meson
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866917464334401536 |
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| author | Dulibić, Lovro Melić, Blaženka Nišandžić, Ivan |
| author_facet | Dulibić, Lovro Melić, Blaženka Nišandžić, Ivan |
| contents | We present updated predictions for the lifetimes of all weakly decaying doubly heavy baryons, including $bb$, $cc$, and $bc$ baryons, as well as for the $B_c$ meson. The analysis includes NNLO corrections to the leading dimension-three contribution, NLO corrections to the chromomagnetic term, and the complete set of currently known NLO corrections to the dimension-six heavy-light quark spectator contributions, including penguin terms. We also compare the results in the $\overline{\rm MS}$, kinetic, and, where applicable, $Υ$ mass schemes. For the $bc$ baryons, we present predictions for both possible ground-state diquark-spin assignments, $S_{bc}=0$ and $S_{bc}=1$. In the kinetic scheme we obtain the lifetime hierarchies $τ(Ξ^0_{bb})<τ(Ξ^-_{bb})\simeqτ(Ω^-_{bb})$, $τ(Ξ^+_{cc})<τ(Ω^+_{cc})<τ(Ξ^{++}_{cc})$, $τ(Ξ^0_{bc})\lesssimτ(Ω^0_{bc})<τ(Ξ^+_{bc})$ for $S_{bc}=0$, and $τ(Ξ^{\prime\, 0}_{bc})<τ(Ω^{\prime\, 0}_{bc})<τ(Ξ^{\prime\, +}_{bc})$ for $S_{bc}=1$. We also revisit the $B_c$ lifetime and discuss the impact of the newly included Darwin term. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_04967 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | New Predictions for the Lifetimes of Doubly Heavy Baryons and the $B_c$ Meson Dulibić, Lovro Melić, Blaženka Nišandžić, Ivan High Energy Physics - Phenomenology High Energy Physics - Experiment We present updated predictions for the lifetimes of all weakly decaying doubly heavy baryons, including $bb$, $cc$, and $bc$ baryons, as well as for the $B_c$ meson. The analysis includes NNLO corrections to the leading dimension-three contribution, NLO corrections to the chromomagnetic term, and the complete set of currently known NLO corrections to the dimension-six heavy-light quark spectator contributions, including penguin terms. We also compare the results in the $\overline{\rm MS}$, kinetic, and, where applicable, $Υ$ mass schemes. For the $bc$ baryons, we present predictions for both possible ground-state diquark-spin assignments, $S_{bc}=0$ and $S_{bc}=1$. In the kinetic scheme we obtain the lifetime hierarchies $τ(Ξ^0_{bb})<τ(Ξ^-_{bb})\simeqτ(Ω^-_{bb})$, $τ(Ξ^+_{cc})<τ(Ω^+_{cc})<τ(Ξ^{++}_{cc})$, $τ(Ξ^0_{bc})\lesssimτ(Ω^0_{bc})<τ(Ξ^+_{bc})$ for $S_{bc}=0$, and $τ(Ξ^{\prime\, 0}_{bc})<τ(Ω^{\prime\, 0}_{bc})<τ(Ξ^{\prime\, +}_{bc})$ for $S_{bc}=1$. We also revisit the $B_c$ lifetime and discuss the impact of the newly included Darwin term. |
| title | New Predictions for the Lifetimes of Doubly Heavy Baryons and the $B_c$ Meson |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2605.04967 |