Probing anomalous right--handed current in Z b bbar vertex

Abstract

Motivated by $-2\sigma$ deviation from the Standard Model prediction for the forward--backward asymmetry of $Z\to b\bar{b}$ decay in the LEP data, we explore the anomalous couplings of $Zb\bar{b}$ vertex through the electroweak precision test extended by including $A_{FB}^b$. We introduce a new variable ${\epsilon }_b^{\prime }$ to measure the anomalous right-handed coupling in $Zb\bar{b}$ vertex. Implications of our analysis on the nonuniversal contact interactions are studied and the left-right model is also considered as a possible origin of the anomalous right-handed couplings.

use elsart.sty, 11 pages, 5 .eps figures included

References in corpus (4)

• Second order QCD corrections to the forward-backward asymmetry in e^+e^- - collisions
• A Model Independent Analysis of LEP and SLD Data on Z-Decays; is the Standard Model Confirmed?
• Shifting $R_b$ with $A_{FB}^b$
• Implications of the recent CERN LEP data on nonuniversal interactions with the precision electroweak tests

Cited by in corpus (4)

• Unitarity violation of the CKM matrix in a nonuniversal gauge interaction model
• Lepton flavour violation in a nonuniversal gauge interaction model
• $SU(4{)}_L\times U(1{)}_X$ models with little Higgs
• The $Zb\bar{b}$ vertex in a left-right model