Observation of the $Λ_\text{b}^0$ $\to$ J/$ψΞ^-$K$^+$ decay
Fuente:
arXiv
Enregistré dans:
| Auteur principal: | |
|---|---|
| Format: | Preprint |
| Publié: |
2024
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866912075705483264 |
|---|---|
| author | CMS Collaboration |
| author_facet | CMS Collaboration |
| contents | Using proton-proton collision data corresponding to an integrated luminosity of 140 fb$^{-1}$ collected by the CMS experiment at $\sqrt{s}$ = 13 TeV, the $Λ_\text{b}^0$ $\to$ J/$ψΞ^-$K$^+$ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the $Λ_\text{b}^0$ $\to$ $ψ$(2S)$Λ$ decay, is measured to be $\mathcal{B}$($Λ_\text{b}^0$ $\to$ J/$ψΞ^-$K$^+$) / $\mathcal{B}$( $Λ_\text{b}^0$ $\to$ $ψ$(2S)$Λ$) = [3.38 $\pm$ 1.02 $\pm$ 0.61 $\pm$ 0.03]%, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in $\mathcal{B}$($ψ$(2S) $\to$ J/$ψπ^+π^-$) and $\mathcal{B}$($Ξ^-$ $\to$ $Λπ^-$). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_16303 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of the $Λ_\text{b}^0$ $\to$ J/$ψΞ^-$K$^+$ decay CMS Collaboration High Energy Physics - Experiment Using proton-proton collision data corresponding to an integrated luminosity of 140 fb$^{-1}$ collected by the CMS experiment at $\sqrt{s}$ = 13 TeV, the $Λ_\text{b}^0$ $\to$ J/$ψΞ^-$K$^+$ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the $Λ_\text{b}^0$ $\to$ $ψ$(2S)$Λ$ decay, is measured to be $\mathcal{B}$($Λ_\text{b}^0$ $\to$ J/$ψΞ^-$K$^+$) / $\mathcal{B}$( $Λ_\text{b}^0$ $\to$ $ψ$(2S)$Λ$) = [3.38 $\pm$ 1.02 $\pm$ 0.61 $\pm$ 0.03]%, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in $\mathcal{B}$($ψ$(2S) $\to$ J/$ψπ^+π^-$) and $\mathcal{B}$($Ξ^-$ $\to$ $Λπ^-$). |
| title | Observation of the $Λ_\text{b}^0$ $\to$ J/$ψΞ^-$K$^+$ decay |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2401.16303 |