Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-07-31
Phys.Rev.D74:076007,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, RevTex4, 20 eps figures
Scientific paper
10.1103/PhysRevD.74.076007
Measurement of the Yukawa interaction between the top quark and the Higgs boson should be useful to clarify the mechanism of fermion mass generation. We discuss the impact of non-standard interactions characterized by dimension-six operators on the effective top Yukawa coupling. The cross section of the process $e^-e^+ \to W^-W^+ \nu \bar \nu \to t \bar t \nu \bar \nu$ is calculated including these operators, and possible deviation from the standard model prediction is evaluated under the constraint from perturbative unitarity and current experimental data. We find that if the new physics scale is in a TeV region, the cross section can be significantly enhanced due to the non-standard interactions. Such a large effect should be detectable at the International Linear Collider.
Kanemura Shinya
Nomura Daisuke
Tsumura Koji
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