The second-order weak correction to (g - 2) of the muon in arbitrary gauge models

Search for the lepton flavor violating decayA0/H0→τ±Assamagan1, Deandrea2, Delsart3 2003Phys. Rev. D723780View full textAdd to dashboardCite

“…In the following we shall consider the effect of flavor violating Higgs-leptons interactions plus the flavor conserving Higgs bosons contributions as the only additional ones with respect to the SM. At one-loop level the Feynman diagrams are those of Figure 1 and the contribution to a µ is given for a large class of models by [26] (see also the erratum in [1] concerning other results in the literature), and can be used to obtain the one-loop Higgs contributions to a µ for the model considered in this paper:…”

“…The reconstructed momenta of the τ lepton using Equations (26) are shown in Figure 6 together with the generated momenta. We demand that the hadronic τ jet carries at least 60% of the τ lepton The rates, σ × BR(pb), for the signal gg → A 0 /H 0 → τ + µ − + τ − µ + , and the backgrounds at the LHC.…”

“…(6) We now cut on the transverse momentum of the τ reconstructed according to Equations (26). The distribution of this variable is shown in Figure 10 where one sees that demanding p τ T > 50 GeV leads to at most 20% reduction in the signal -the τ gets harder at higher m A so the reduction in the signal due to this cut is highest at the lowest mass considered, i.e., m A = 120 GeV -while the W ± +jets and Z 0 (γ * ) → τ + τ − backgrounds are suppressed by additional factors of two and ten respectively.…”

Muon anomalous magnetic moment confronts exotic fermions and gauge bosons

“…Under the simplifying assumption that only one species of such exotic fermion (F ) exists, we have [10] …”

“…The fundamental (27-dimensional) representation of E 6 contains 16, 10 and 1-plets of SO (10). The 10-plet of SO (10) contains a vectorlike lepton isodoublet (N E , E) and the 1-plet is an isosinglet neutrino N. In addition, the 16-plet contains a right-handed neutrino (ν R ) which is singlet under the entire electroweak gauge group.…”