Hard $m_t$ Corrections as a Probe of the Symmetry Breaking Sector

Details Hard $m_t$ Corrections as a Probe of the Symmetry Breaking Sector Hard $m_t$ Corrections as a Probe of the Symmetry Breaking Sector

1996-11-29

arxiv.org/abs/hep-ph/9612207v1

Phys.Rev.Lett. 78 (1997) 2902-2905

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTex, 8 pages, 1 postscript figure included

Scientific paper

10.1103/PhysRevLett.78.2902

Non-decoupling effects related to a large $m_t$ affecting non-oblique radiative corrections in vertices ($Z\bar{b}b$) and boxes ($B$-$\bar{B}$ mixing and $\epsilon_K$) are very sensitive to the particular mechanism of spontaneous symmetry breaking. We analyze these corrections in the framework of a chiral electroweak standard model and find that there is only one operator in the effective lagrangian which modifies the longitudinal part of the $W^+$ boson without touching the oblique corrections. The inclusion of this operator affects the $Z\bar{b}b$ vertex, the $B$-$\bar{B}$ mixing and the CP-violating parameter $\epsilon_K$, generating interesting correlations among the hard $m_t^4 \log m_t^2$ corrections to these observables, for example, the maximum vertex $Z b\bar{b}$ correction allowed by low energy physics is about one percent.

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