PoS(ICHEP2022)1000 New physics sensitivity in Λ b → Λ (*) μ + μ - and Λ b → Λ (*) ν ¯ ν baryonic decays Nilakshi Das ,* and Rupak Dutta National institute of Technology Silchar 788010, Silchar, India E-mail: nilakshi_rs@phy.nits.ac.in, rupak@phy.nits.ac.in The flavor changing neutral b decays with di-leptons and di-neutrinos in the final state provide a great platform to explore physics beyond the standard model (SM). The recent measurements predicted by LHCb on R K , R K S , R K*+ , B( B s → φμ + μ - ) and B( B s → μ + μ - ) proceeding via b → s‘ + ‘ - quark level transitions show a significant deviation from the standard model expectations. Very recently, Belle II collaboration reported a more precise upper bound of the branching fraction of B( B → K + ν ¯ ν) < 4.1 × 10 -5 by employing a new inclusive tagging approach. The b → s‘ + ‘ - and b → s ν ¯ ν decay channels are related in the SM as well as in beyond the SM physics. In the beyond SM physics, they are related via SU(2) L gauge symmetry and can be studied simultaneously in a model independent standard model effective field theory (SMEFT) approach. Moreover, b → s ν ¯ ν decay channels are theoretically cleaner than the corresponding b → s‘ + ‘ - decays due to the absence of non factorizable corrections and photonic penguin contributions. In this context, we perform a combined analysis of Λ b → Λ (*) μ + μ - and Λ b → Λ (*) ν ¯ ν decay modes and study the implication of b → s‘ + ‘ - anomalies in a model independent SMEFT approach. We give predictions of several physical observables within SM and within several new physics scenarios. 41st International Conference on High Energy physics (ICHEP 2022), 6-13 July, 2022 Bologna, Italy * Speaker © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). https://pos.sissa.it/