Speaker
Description
Following the recent first observation of baryonic CP violation in $\Lambda_b \rightarrow p K^- \pi^+ \pi^+$ with the Run 1 and 2 dataset, it is vital to study the pattern of CP asymmetries and branching fractions in a wide range of baryonic decay modes. These measurements form important inputs to theoretical approaches such as QCD factorisation.
The upgraded LHCb detector operates at an instantaneous luminosity five times higher than in Runs 1 and 2 and has transitioned from a hardware-based first-level trigger to a fully software trigger. This is particularly advantageous for fully hadronic final state decays, where the efficiency of the previous hardware trigger would quickly saturate at higher luminosities.
During 2024 and 2025, LHCb recorded integrated luminosities of 9.56 fb$^{-1}$ and 11.81 fb$^{-1}$ respectively, more than twice the total dataset collected in Runs 1 and 2 combined. This unprecedented dataset opens new opportunities for precision flavour-physics measurements.
We present ongoing work towards a measurement of the branching fractions of $\Lambda_b \rightarrow \Lambda h^+ h^- (h = \pi, K)$ decays with 2024 data, laying the foundations for a CP violation study using the full Run 3 dataset.