Chromomycosis

The littlest Higgs model with T-parity, which is called LHT model, predicts the existence of the new particles, such as heavy top quarks, heavy gauge bosons, and mirror fermions. We calculate the one-loop contributions of these new particles to the top quark chromomagnetic dipole moment (CMDM) ΔK. We find that the contribution of the LHT model is one order of magnitude smaller than the standard model prediction value.

Section: Discussionmentioning

confidence: 97%

“…For example, 80 millions top quark pairs will be produced at the LHC per year. [2] This number will increase by one order of magnitude with the high luminosity option. With such large samples, precise measurements of its couplings will be available to test new physics beyond the SM.…”

Section: Introductionmentioning

confidence: 99%

Top Quark Chromomagnetic Dipole Moment in the Littlest Higgs Model with T -Parity

Ding

Yue

2008

“…This huge mass might be a hint that top quark plays an essential role in search for new physics originating from physics at higher scale. [15] Hence, the study of interaction of top quark with W ′ might give useful information about W ′ . For example, the interference between W ′ and W in the production of single top quarks is important and could be useful in search for W ′ .…”

Section: Introductionmentioning

confidence: 99%

Heavy Charged Gauge Bosons with General CP Violating Couplings

Najafabadi

2010

Heavy gauge bosons such as W ′ are expected to exist in many extensions of the Standard Model. In this paper, it is shown that the most general Lagrangian for the interaction of W ′ with top and bottom quarks which consists of V-A and V+A structure with in general complex couplings produces an Electric Dipole Moment (EDM) for the top quark at one loop level. We predict the allowed ranges for the mass and couplings of W ′ by using the upper limit on the top quark EDM.

“…Since top quark is far more massive than other SM fermions, its interactions may be quite sensitive to new physics originating at higher scale. [1] If there are any deviations from the SM expectations in the properties of the top quark, they may indirectly lead to modifications in the anticipated branching fractions.…”

Section: Introductionmentioning

confidence: 99%

Study of Top Quark FCNC

Najafabadi

Tazik

2009

The potential of the LHC for investigation of anomalous top quark interactions with gluon (tug, tcg) through the production of tW-channel of single top quark is studied. In the Standard Model, the single top quarks in the tW-channel mode are charge symmetric meaning that σ(pp → t + W −) = σ(pp → ¯ t + W +). However, the presence of anomalous FCNC couplings leads to charge asymmetry. In this paper a method is proposed in which this charge asymmetry may be used to constrain anomalous FCNC couplings. The strength of resulting constraints is estimated for the LHC for the center of mass energies of 7 and 14 TeV.