Signals of Z' boson in the Bhabha process within the LEP2 data set

Details Signals of Z' boson in the Bhabha process within the LEP2 data set Signals of Z' boson in the Bhabha process within the LEP2 data set

2005-10-27

arxiv.org/abs/hep-ph/0510354v2

Phys.Atom.Nucl.70:1100-1106,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 4 figures. The paper was completely rewritten on the base of new data

Scientific paper

10.1134/S1063778807060129

The LEP2 data set on the Bhabha process is analyzed with the aim to detect the signals of the heavy virtual Z' gauge bosons. The state interacting with the left-handed standard-model doublets and called the Chiral Z' is investigated. This particle was introduced already as the low-energy state allowed by the renormalizability of the model. The contribution of the Chiral Z' state to the Bhabha process is described by two parameters: the coupling to electrons and the Z-Z' mixing angle. The sign-definite one-parameter observable is proposed to measure the Z' coupling to the electron current. The one-parameter fit of the data shows no signals of the particle. The alternative two-parameter fit of the differential cross-sections is also performed. It also shows no Chiral Z' signals. The comparisons with other fits are discussed.

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