Revisiting lifetimes of doubly charmed baryons
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866917445834375168 |
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| author | Dulibić, Lovro Gratrex, James Melić, Blaženka Nišandžić, Ivan |
| author_facet | Dulibić, Lovro Gratrex, James Melić, Blaženka Nišandžić, Ivan |
| contents | We present updated predictions for lifetimes of doubly charmed baryons, within the heavy quark expansion, including available NLO $α_s$ contributions and newly-computed terms in the $1/m_c$ series. Our improved results confirm the expected hierarchy $$τ(Ξ_{cc}^{+}) < τ(Ω_{cc}^{+}) < τ(Ξ_{cc}^{++}) \,, $$ while the predicted lifetime $τ(Ξ_{cc}^{++}) = 0.32 \pm 0.05 ^{+0.08}_{-0.07} \,\textrm{ps} $ is consistent with the recent LHCb determination. We provide predictions for the lifetime ratios of the $Ξ_{cc}^{+}$ and $Ω_{cc}^+$ baryons relative to the $Ξ_{cc}^{++}$ baryon, namely $τ(Ξ_{cc}^{+})/τ(Ξ_{cc}^{++})=0.22\pm 0.05\pm 0.04$ and $τ(Ω_{cc}^{+})/τ(Ξ_{cc}^{++})=0.52\pm 0.13^{+0.03}_{-0.02}$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2305_02243 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Revisiting lifetimes of doubly charmed baryons Dulibić, Lovro Gratrex, James Melić, Blaženka Nišandžić, Ivan High Energy Physics - Phenomenology We present updated predictions for lifetimes of doubly charmed baryons, within the heavy quark expansion, including available NLO $α_s$ contributions and newly-computed terms in the $1/m_c$ series. Our improved results confirm the expected hierarchy $$τ(Ξ_{cc}^{+}) < τ(Ω_{cc}^{+}) < τ(Ξ_{cc}^{++}) \,, $$ while the predicted lifetime $τ(Ξ_{cc}^{++}) = 0.32 \pm 0.05 ^{+0.08}_{-0.07} \,\textrm{ps} $ is consistent with the recent LHCb determination. We provide predictions for the lifetime ratios of the $Ξ_{cc}^{+}$ and $Ω_{cc}^+$ baryons relative to the $Ξ_{cc}^{++}$ baryon, namely $τ(Ξ_{cc}^{+})/τ(Ξ_{cc}^{++})=0.22\pm 0.05\pm 0.04$ and $τ(Ω_{cc}^{+})/τ(Ξ_{cc}^{++})=0.52\pm 0.13^{+0.03}_{-0.02}$. |
| title | Revisiting lifetimes of doubly charmed baryons |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2305.02243 |