New Vector Boson Near the Z-pole and the Puzzle in Precision Electroweak Data

We show that a Z' with suppressed couplings to the electron compared to the Z-boson, with couplings to the b-quark, and with a mass close to the mass of the Z-boson, provides an excellent fit to forward-backward asymmetry of the b-quark and R_b measured on the Z-pole and \(\pm 2\) GeV off the Z...

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Bibliographic Details
Published in:arXiv.org 2011-05
Main Authors: Dermisek, Radovan, Kim, Sung-Gi, Raval, Aditi
Format: Article
Language:English
Subjects:
Asymmetry
Couplings
Quarks
Online Access:Get full text
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Summary:We show that a Z' with suppressed couplings to the electron compared to the Z-boson, with couplings to the b-quark, and with a mass close to the mass of the Z-boson, provides an excellent fit to forward-backward asymmetry of the b-quark and R_b measured on the Z-pole and \(\pm 2\) GeV off the Z-pole, and to A_e obtained from the measurement of left-right asymmetry for hadronic final states. It also leads to a significant improvement in the total hadronic cross section on the Z-pole and R_b measured at energies above the Z-pole. In addition, with a proper mass, it can explain the excess of \(Zb\bar b\) events at LEP in the 90-105 GeV region of the \(b\bar b\) invariant mass.
ISSN:2331-8422
DOI:10.48550/arxiv.1105.0773