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Electroweak precision measurements of a nearly-degenerate Z′-Z system.

Authors :
Qiu, Dayun
Tang, Yi-Lei
Source :
Journal of High Energy Physics. May2024, Vol. 2024 Issue 5, p1-32. 32p.
Publication Year :
2024

Abstract

In this paper, we discuss the possibility to probe a nearly-degenerate Z′-Z system by analyzing the Z-lineshape at an electron-positron collider. Compared with the usual Z′ in the literature well separated with the standard model (SM) Z boson in mass, the nearly-degenerate Z′-Z mixing affects the observed effective “oblique parameters” , , , and the effective deviation of “number of neutrino species” in a more complicated way and cannot be simply computed perturbatively up to a particular order. Aiming at solving this problem, we write down a general simplified effective Lagrangian and enumerate some parameter spaces corresponding to some typical models, and suggest a method to extract the constraints by looking into the line-shape of the Z-like resonance at an electron-positron collider. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
11266708
Volume :
2024
Issue :
5
Database :
Academic Search Index
Journal :
Journal of High Energy Physics
Publication Type :
Academic Journal
Accession number :
179492788
Full Text :
https://doi.org/10.1007/JHEP05(2024)167