Abstract
Lepton flavour violation (LFV) naturally occurs in many new physics models, specifically in those explaining the B anomalies. While LFV has already been studied for mesonic decays, it is important to consider also baryonic decays mediated by the same quark transition. In this paper, we study LFV in the baryonic Lambda _b rightarrow Lambda ell _1 ell _2 using for the first time a full basis of New Physics operators. We present expected bounds on the branching ratio in a model-independent framework and using two specific new physics models. Finally, we point out the interplay and orthogonality between the baryonic and mesonic LFV searches.
Highlights
The incredible joint theoretical and experimental effort carried out in the last years allows us to probe the Standard Model (SM) of particle physics with an unprecedented precision
We focus on the branching ratio and forward–backward asymmetry: dB 1 2 dq2 = 2 (0)τ b a+ c 3
The results found in the above sections indicate that b → 1 2 decays are very good probes of physics beyond the SM and provide in certain scenarios complementary bounds with respect to the ones from B → 1 2 and B+ → K + 1 2 decays
Summary
The incredible joint theoretical and experimental effort carried out in the last years allows us to probe the Standard Model (SM) of particle physics with an unprecedented precision This brought to light some deviations between theoretical predictions and experimental measurements in semileptonic B meson decays [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]. These discrepancies, the socalled B anomalies, hint at Lepton Flavour Universality (LFU) violation.
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