Observation of the $Ξ^-_\mathrm{b}$ $\to$ $ψ$(2S)$Ξ^-$ decay and studies of the $Ξ_\mathrm{b}$(5945)$^{0}$ baryon in proton-proton collisions at $\sqrt{s}$ = 13 TeV
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866917744573677568 |
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| author | CMS Collaboration |
| author_facet | CMS Collaboration |
| contents | The first observation of the decay $Ξ^-_\mathrm{b}$ $\to$ $ψ$(2S)$Ξ^-$ and measurement of the branching ratio of $Ξ^-_\mathrm{b}$ $\to$ $ψ$(2S)$Ξ^-$ to $Ξ^-_\mathrm{b}$ $\to$ J/$ψ$$Ξ^-$ are presented. The J/$ψ$ and $ψ$(2S) mesons are reconstructed using their dimuon decay modes. The results are based on proton-proton colliding beam data from the LHC collected by the CMS experiment at $\sqrt{s}$ = 13 TeV in 2016-2018, corresponding to an integrated luminosity of 140 fb$^{-1}$. The branching fraction ratio is measured to be $\mathcal{B}$($Ξ^-_\mathrm{b}$ $\to$ $ψ$(2S)$Ξ^-$) / $\mathcal{B}$($Ξ^-_\mathrm{b}$ $\to$ J/$ψ$$Ξ^-$) = 0.84 $^{+0.21}_{-0.19}$ (stat) $\pm$ 0.10 (syst) $\pm$ 0.02 ($\mathcal{B}$), where the last uncertainty comes from the uncertainties in the branching fractions of the charmonium states. New measurements of the $Ξ_\mathrm{b}$(5945)$^{0}$ baryon mass and natural width are also presented, using the $Ξ_\mathrm{b}^-π^+$ final state, where the $Ξ^-_\mathrm{b}$ baryon is reconstructed through the decays J/$ψΞ^-$, $ψ$(2S)$Ξ^-$, J/$ψΛ$K$^-$, and J/$ψΣ^0$K$^-$. Finally, the fraction of the $Ξ^-_\mathrm{b}$ baryons produced from $Ξ_\mathrm{b}$(5945)$^{0}$ decays is determined. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_17738 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of the $Ξ^-_\mathrm{b}$ $\to$ $ψ$(2S)$Ξ^-$ decay and studies of the $Ξ_\mathrm{b}$(5945)$^{0}$ baryon in proton-proton collisions at $\sqrt{s}$ = 13 TeV CMS Collaboration High Energy Physics - Experiment The first observation of the decay $Ξ^-_\mathrm{b}$ $\to$ $ψ$(2S)$Ξ^-$ and measurement of the branching ratio of $Ξ^-_\mathrm{b}$ $\to$ $ψ$(2S)$Ξ^-$ to $Ξ^-_\mathrm{b}$ $\to$ J/$ψ$$Ξ^-$ are presented. The J/$ψ$ and $ψ$(2S) mesons are reconstructed using their dimuon decay modes. The results are based on proton-proton colliding beam data from the LHC collected by the CMS experiment at $\sqrt{s}$ = 13 TeV in 2016-2018, corresponding to an integrated luminosity of 140 fb$^{-1}$. The branching fraction ratio is measured to be $\mathcal{B}$($Ξ^-_\mathrm{b}$ $\to$ $ψ$(2S)$Ξ^-$) / $\mathcal{B}$($Ξ^-_\mathrm{b}$ $\to$ J/$ψ$$Ξ^-$) = 0.84 $^{+0.21}_{-0.19}$ (stat) $\pm$ 0.10 (syst) $\pm$ 0.02 ($\mathcal{B}$), where the last uncertainty comes from the uncertainties in the branching fractions of the charmonium states. New measurements of the $Ξ_\mathrm{b}$(5945)$^{0}$ baryon mass and natural width are also presented, using the $Ξ_\mathrm{b}^-π^+$ final state, where the $Ξ^-_\mathrm{b}$ baryon is reconstructed through the decays J/$ψΞ^-$, $ψ$(2S)$Ξ^-$, J/$ψΛ$K$^-$, and J/$ψΣ^0$K$^-$. Finally, the fraction of the $Ξ^-_\mathrm{b}$ baryons produced from $Ξ_\mathrm{b}$(5945)$^{0}$ decays is determined. |
| title | Observation of the $Ξ^-_\mathrm{b}$ $\to$ $ψ$(2S)$Ξ^-$ decay and studies of the $Ξ_\mathrm{b}$(5945)$^{0}$ baryon in proton-proton collisions at $\sqrt{s}$ = 13 TeV |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2402.17738 |