Constraints on the malaphoric $$B_3-L_2$$ model from di-lepton resonance searches at the LHC
Year: 2025
Type: article
Abstract: We confront the malaphoric $$B_3-L_2$$ B 3 - L 2 model with bounds coming from a search for resonances in the di-lepton channels at the 13 TeV LHC. In contrast to the original $$B_3-L_2$$ B 3 - L 2 model, the $$Z^\prime $$ Z ′ of the malaphoric $$B_3-L_2$$ B 3 - L 2 model has sizeable couplings to the lighter two families; these originate from order unity kinetic mixing with the hypercharge gauge boson and ameliorate the fit to lepton flavour universality measurements in B -meson decays. The $$Z^\prime $$ Z ′ coupling to the first two families of quark means that the resulting constraints from resonant di-lepton searches are stronger. Nevertheless, we find that for $$M_{Z^\prime }>2.8$$ M Z ′ > 2.8 TeV there remains a non-negligible region of allowed parameter space where the model significantly improves upon several Standard Model predictions for observables involving the $$b \rightarrow s l^+ l^-$$ b → s l + l - transition. We estimate that the 3000 fb $$^{-1}$$ - 1 HL-LHC will extend this sensitivity to $$M_{Z^\prime }= 4.2$$ M Z ′ = 4.2 TeV.
Source: The European Physical Journal C
Author: Ben Allanach
Institution: University of Cambridge
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4408454684