1,034 research outputs found

    Renormalization Group Equations for the CKM matrix

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    We derive the one loop renormalization group equations for the Cabibbo-Kobayashi-Maskawa matrix for the Standard Model, its two Higgs extension and the minimal supersymmetric extension in a novel way. The derived equations depend only on a subset of the model parameters of the renormalization group equations for the quark Yukawa couplings so the CKM matrix evolution cannot fully test the renormalization group evolution of the quark Yukawa couplings. From the derived equations we obtain the invariant of the renormalization group evolution for three models which is the angle α\alpha of the unitarity triangle. For the special case of the Standard Model and its extensions with v1v2v_{1}\approx v_{2} we demonstrate that also the shape of the unitarity triangle and the Buras-Wolfenstein parameters ρˉ=(11/2λ2)ρ\bar{\rho}=(1-{1/2}\lambda^{2})\rho and ηˉ=(11/2λ2)η\bar{\eta}=(1-{1/2}\lambda^{2})\eta are conserved. The invariance of the angles of the unitarity triangle means that it is not possible to find a model in which the CKM matrix might have a simple, special form at asymptotic energies.Comment: 9 page

    Rare top decay and CP violation in THDM

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    We discuss the formalism of two Higgs doublet model type III with CP violation from CP-even CP-odd mixing in the neutral Higgs bosons. The flavor changing interactions among neutral Higgs bosons and fermions are presented at tree level in this type of model. These assumptions allow the study rare top decays mediated by neutral Higgs bosons, particularly we are interested in tcl+lt\rightarrow c l^+l^-. For this process we estimated upper bounds of the branching ratios Br(tcτ+τ)\textrm{Br}(t\rightarrow c \tau^+\tau^-) of the order of 10910710^{-9}\sim 10^{-7} for a neutral Higgs boson mass of 125 GeV and tanβ=1\tan\beta=1, 1.5, 2, 2.5. For the case of tcτ+τt\rightarrow c \tau^+\tau^- the number of possible events is estimated from 1 to 10 events which could be observed in future experiments at LHC with a luminosity of 300 fb1\textrm{fb}^{-1} and 14 GeV for the energy of the center of mass. Also we estimate that the number of events for the process tcl+lt\rightarrow c l^+l^- in different scenarios is of order of 25002500.Comment: 8 pages, 5 figure

    Rare top decay t-> c l+l- as a probe of new physics

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    The rare top decay t-> c l+l-, which involves flavor violation, is studied as a possible probe of new physics. This decay is analyzed with the simplest Standard Model extensions with additional gauge symmetry formalism. The considered extension is the Left-Right Symmetric Model, including a new neutral gauge boson Z' that allows to obtain the decay at tree level through Flavor Changing Neutral Currents (FCNC) couplings. The neutral gauge boson couplings are considered diagonal but family non-universal in order to induce these FCNC. We find the $BR(t-> c l+l-)~10^{-13} for a range 1 TeV < M_{Z'} < 3 TeV.Comment: 9 pages, 6 figure
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