Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-09-13
Phys.Rev. D62 (2000) 015011
Physics
High Energy Physics
High Energy Physics - Phenomenology
54 pages, 11 figures
Scientific paper
10.1103/PhysRevD.62.015011
We explore the radiative corrections to the process $Z \to b \bar b$ in models with extended Higgs sectors. The observables $R_b = \Gamma(Z \to b \bar b)/\Gamma(Z \to \rm{hadrons})$ and the $Z b \bar b$ coupling asymmetry, $A_b = (g_L^2 - g_R^2)/(g_L^2 + g_R^2)$, are sensitive to these corrections. We present general formulae for the one-loop corrections to $R_b$ and $A_b$ in an arbitrary extended Higgs sector, and derive explicit results for a number of specific models. We find that in models containing only doublets, singlets, or larger multiplets constrained by a custodial $SU(2)_{c}$ symmetry so that $M_W = M_Z \cos\theta_W$ at tree level, the one-loop corrections due to virtual charged Higgs bosons always worsen agreement with experiment. The $R_{b}$ measurement can be used to set lower bounds on the charged Higgs masses. Constraints on models due to the one-loop contributions of neutral Higgs bosons are also examined.
Haber Howard E.
Logan Heather E.
No associations
LandOfFree
Radiative Corrections to the $Z b \bar{b}$ Vertex and Constraints on Extended Higgs Sectors does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Radiative Corrections to the $Z b \bar{b}$ Vertex and Constraints on Extended Higgs Sectors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radiative Corrections to the $Z b \bar{b}$ Vertex and Constraints on Extended Higgs Sectors will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-464498