6 research outputs found
Flavor-changing top quark rare decays in the Bestest Little Higgs Model
This paper investigates the effects of parameters in the Bestest Little Higgs
Model (BLHM) on rare flavor-changing decays of the top quark. As a result,
flavor-changing phenomena are introduced in the BLHM for the first time. In
this study, we incorporate new flavor mixing terms between the light quarks of
the Standard Model (SM) and the fermions and bosons of the BLHM. We compute the
one-loop contributions from the heavy quark and the heavy bosons
. Our findings demonstrate
that the branching ratios of decays and , where
and , exhibit improvements compared to their counterparts in
the SM, except for the gluon case. Moreover, we observe that the processes with
higher sensitivity are , and within the appropriate parameter
space.Comment: 13 pages and 10 figure
Sensitivity limits on the weak dipole moments of the top-quark at the Bestest Little Higgs Model
We presented new researches for the sensitivity limits on the weak dipole
moments of the top quark- boson interactions in the context of the Bestest
Little Higgs Model (BLHM). For this purpose, we derive the corresponding
Feynman rules. Among the new contributions, there are those arising from the
vertices of scalar bosons, vector bosons and heavy quarks contribution:
, (); , (); and
(). With these new
vertices, we calculate the one-loop contributions to the weak dipole moments
and of the top-quark in several scenarios. We found that with
the parameters of the BLHM of GeV, GeV,
GeV, GeV and , the reaches
values with a sensitivity of , , where the main
contribution comes from the scalars and , which couples to the
top-quark of the Standard Model and the top-quarks of the BLHM. These values
seem to be out of the reach of the expected experimental sensitivity of present
experiments. However, experiments on future colliders are expected to be
sensitive enough to measure the AWMDM of the top-quark. Our study complements
other studies at the level of one-loop with an extended scalar sector.Comment: 48 pages, 21 figure
Research on the electromagnetic and weak dipole moments of the tau-lepton at the Bestest Little Higgs Model
In this paper, using the Bestest Little Higgs Model (BLHM) we calculate at the one-loop level the contributions to the Anomalous Magnetic Dipole Moment (AMDM) and Anomalous Weak Magnetic Dipole Moment (AWMDM) of the tau-lepton. The implications from this model are studied, emphasizing the contributions of the new physics induced by the new scalar and vector bosons of the BLHM: , and because these quantify the new physics. With these new contributions, we estimated bounds on the real and imaginary parts of the AMDM and AWMDM of the tau-lepton. Our study complements other one-loop-level research performed on models beyond the Standard Model
Flavor-changing top quark rare decays in the Bestest Little Higgs Model
Abstract This paper investigates rare flavor-changing decays of the top quark in the Bestest Little Higgs Model (BLHM). As a result, flavor-changing phenomena are introduced in the BLHM for the first time. In this study, we incorporate new flavor mixing terms between the light quarks of the Standard Model (SM) and the fermions and bosons of the BLHM. We compute the one-loop contributions from the heavy quark (B) and the heavy bosons ( W ′ ± , ϕ ± , η ± , H ± ) . Our findings demonstrate that the branching ratios of decays t → q V and t → q h 0 , where q = u , c and V = Z , γ , g , can reach larger branching ratios compared to their counterparts in the SM, except for the gluon case. Moreover, we observe that the processes with the highest sensitivity are B r ( t → c Z ) ∼ 10 - 5 , B r ( t → c γ ) ∼ 10 - 6 and B r ( t → c h 0 ) ∼ 10 - 8 within the appropriate parameter space