Observation of the charmless purely baryonic decay $Λ_b^{0} \to Λp \bar{p}$ at LHCb
Fuente:
arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866910124895895552 |
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| author | Rodriguez, Alexande Brea |
| author_facet | Rodriguez, Alexande Brea |
| contents | The first observation of a charmless purely baryonic decay, $Λ_b^{0} \to Λp \bar{p}$, is reported using the full Run 2 LHCb dataset, corresponding to an integrated luminosity of $6.0~fb^{-1}$. The branching fraction is measured relative to that of the topologically similar normalisation mode $Λ_b^{0} \to ΛK^+K^-$. A simultaneous fit to the long- and downstream-track categories yields a signal significance of $5.1σ$ after including systematic uncertainties. The relative branching fraction is measured to be $\left(5.13 \pm 1.28_{\rm stat} \pm 0.27_{\rm syst}\right)\times 10^{-2}$ in the region $m(h^+h^-)< 2.85$ GeV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_11325 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Observation of the charmless purely baryonic decay $Λ_b^{0} \to Λp \bar{p}$ at LHCb Rodriguez, Alexande Brea High Energy Physics - Experiment The first observation of a charmless purely baryonic decay, $Λ_b^{0} \to Λp \bar{p}$, is reported using the full Run 2 LHCb dataset, corresponding to an integrated luminosity of $6.0~fb^{-1}$. The branching fraction is measured relative to that of the topologically similar normalisation mode $Λ_b^{0} \to ΛK^+K^-$. A simultaneous fit to the long- and downstream-track categories yields a signal significance of $5.1σ$ after including systematic uncertainties. The relative branching fraction is measured to be $\left(5.13 \pm 1.28_{\rm stat} \pm 0.27_{\rm syst}\right)\times 10^{-2}$ in the region $m(h^+h^-)< 2.85$ GeV. |
| title | Observation of the charmless purely baryonic decay $Λ_b^{0} \to Λp \bar{p}$ at LHCb |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2604.11325 |