2023/03/29 by Alok, Ashutosh Kumar, Chundawat, Neetu Raj Singh, Mandal, Arindam
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2303.16606
In this work we study the potential of the lepton flavor ratios RKτμ ≡ Γ(B → K τ+ τ-)/ Γ(B → K μ+ μ-) and RK*τμ ≡ Γ(B → K^* τ+ τ-)/ Γ(B → K^* μ+ μ-) to probe lepton flavor universality (LFU) violation in τ-μ sector. We show that these ratios can deviate from their SM values even if the new physics couplings are universal in nature, i.e., having equal couplings to e, μ and τ leptons. Therefore in order to utilize these observables to probe LFU violation, we need to compare the allowed range of RK(*)τμ for class of solutions with only universal couplings to leptons and solutions having both universal and non-universal components. For the current b → s ℓ ℓ (ℓ=e, μ) data, we find that these two class of solutions can be discriminated provided the measured value of RK*τμ is greater than the SM prediction.