SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 25: Flavor II

T 25.5: Talk

Tuesday, March 21, 2023, 18:00–18:15, HSZ/0304

enhancing Bs to e+e- to an observable level — •Gilberto Tetlalmatzi-Xolocotzi — Siegen University, Siegen, Germany

As a result of the helicity suppression effect, within the Standard Model the rare decay channel $B_s\rightarrow e^+e^-$ has a decay probability which is extremely suppressed, being five orders of magnitude below current experimental limits. Thus, any observation of this channel within the current or forthcoming experiments will give unambiguous evidence of Physics Beyond the Standard Model. In this work, we present for the first time a New Physics scenario in which the branching fraction $\mathcal{B}r(B_s\rightarrow e^+ e^-)$ is enhanced up to values which saturate the current experimental bounds. More concretely, we study the general Two-Higgs-Doublet Model (2HDM) with a pseudoscalar coupling to electrons unsuppressed by the electron mass. Furthermore, we demonstrate how this scenario can arise from a UV-complete theory of quark-lepton unification that can live at a low scale.