Search

The rare leptonic decays Bs, d → l+l− (l = e, μ, τ) present an important base to analyse the flavour structure of the standard model (SM) and also become a potential source to dig out possible signatures of new physics (NP) beyond the SM. The muonic decay Bs, d → μ+μ− has been observed at the LHC as well as the upper limits of branching ratios for other Bs, d → l+l− decays have been updated recently. In this paper, using the χ2 fitting method we have studied all these decay channels considering the effect of a Z′ boson. Our analysing method reproduces the result of the muonic channel of Bs meson, hence we have used the same strategy for the other Bs, d → l+l− decays. [ABSTRACT FROM AUTHOR]

Recently, some small hints of lepton flavor violating (LFV) decays have been probed in different colliders and accelerators. Although these processes are forbidden in the Standard Model (SM), observation of LFV decays are considered as good probes to test theory beyond the SM. In this paper, we study some LFV decays, e.g. three-body decay channels of μ lepton like μ → 3 e , μ → e ν ν ̄ and two-body decays of B meson and τ lepton like B s , d → μ ± e ∓ and τ → e ϕ in Z ′ model. We calculate the branching ratio of the above decays considering the effect of both Z and Z ′ -mediated flavor-changing neutral-current (FCNC). [ABSTRACT FROM AUTHOR]

New heavy vector bosons and light scalars are predicted in a plethora of models of new physics. In particular, in new strongly interacting sectors they play the role of the ρ and π mesons in QCD. We show that some of their interactions, for example those required for the explanation of the B anomalies and the g - 2 of the muon, can be only probed in B meson decays. We highlight new golden channels not yet studied experimentally, including B + → K + (D +) μ + μ - μ + μ - and B 0 → K ∗ 0 μ + μ - μ + μ - . Relying on generator level simulations for data taking with the LHCb detector, we determine the reach of this facility to the aforementioned processes. We show that branching ratios as small as 9 × 10 - 12 ( 3.2 × 10 - 10 ) and 2.7 × 10 - 11 can be tested at the 95% CL respectively. [ABSTRACT FROM AUTHOR]