Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-12-31
Phys.Rev. D50 (1994) 6872-6876
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages + 3 figures (available upon request), TeX file. Saha Institute Preprint no. SINP-TNP/93-22 (December 1993)
Scientific paper
10.1103/PhysRevD.50.6872
Isodoublet color-octet scalar bosons appear in the low-energy limit of a natural extension of the Standard Model in which the electroweak symmetry is broken by a $t\bar t$ condensate. We briefly discuss the model and show that radiative corrections (involving these scalars) to the branching ratio $R_b=\Gamma (Z\rightarrow b\bar b)/\Gamma (Z\rightarrow {\rm hadrons})$ are negative and thus place a stringent lower bound on the masses of the colored scalars. This turns out to be $\sim 400$ GeV with $m_t=150$ GeV and increases quadratically with $m_t$. It is emphasized that $R_b$ is a parameter that is well-determined experimentally and that theoretical estimates are relatively free from uncertainties emanating from hadronic corrections and are comparatively insensitive to the value of the top mass.
De Triptesh
Dutta-Roy Binayak
Kundu Anjan
Raychaudhuri Sreerup
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