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

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

1999-04-23

arxiv.org/abs/hep-ph/9904435v1

Phys.Lett. B472 (2000) 366-372

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1016/S0370-2693(99)01453-7

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 $Z b \bar{b}$ vertex through the electroweak precision test extended by including $A_{FB}^b$. We introduce a new variable $\epsilon'_b$ to measure the anomalous right-handed coupling in $Z b \bar{b}$ 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.

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