First observation of the $\bar{B}_{s}^0 \to \Lambda_c^+ \bar{\Lambda}_c^-$ decay and evidence for the $\bar{B}^0 \to \Lambda_c^+ \bar{\Lambda}_c^-$ decay
- Aaij, Roel et al
- arXiv:2511.20476LHCb-PAPER-2025-053CERN-EP-2025-258
 | : width=0.47\textwidth |
 | : width=0.5\textwidth : Tree-level Feynman diagrams for $\Bdsb\to\Lc\Lcbar$ decays. The left diagram shows the contribution from the $W$-emission process, while the right one depicts the $W$-exchange process. |
 | Mass distribution of the $\Lc\Lcbar$ system with singly charmed and charmless backgrounds subtracted. The fit result (blue curve) is shown together with the signal components from $\Bdb\to\Lc\Lcbar$ (filled green) and $\Bsb\to\Lc\Lcbar$ (filled purple) decays, and the nonresonant background contribution (filled gray). |
 | : width=0.5\textwidth |
 | : width=0.5\textwidth : Distributions of the (left) \Lc and (right) \Lcbar mass for the signal sample. Also shown is the projection of the two-dimensional fit (solid blue line) integrated over all $m(\Lc\Lcbar)$ bins, along with the contributions from doubly charmed (dashed red), singly charmed (filled green), and charmless (filled brown) decays. |
 | : width=0.5\textwidth |
 | : width=0.5\textwidth : Mass distribution of the $\Dsm\Dp$ system, with singly charmed and charmless backgrounds subtracted, shown for (left) Run~1 and (right) Run~2 data-taking periods. The fit projection (solid blue line) is shown together with the signal components from \BdDsD (filled green) and \BsDsD (filled purple) decays, and the background contribution (filled gray). |
 | : width=0.5\textwidth |
 | : width=0.5\textwidth : Mass distribution of the $\Dsp\Dsm$ system, with singly charmed and charmless backgrounds subtracted, shown for (left) Run~1 and (right) Run~2 data-taking periods. The fit projection (solid blue line) is shown together with the \BsDsDs signal (filled purple) and the background (filled gray). |