Lepton flavor conserving Z boson decays and scalar unparticle

TL;DR

This paper investigates how scalar unparticles could influence Z boson decays into lepton pairs, potentially explaining discrepancies between experimental data and standard model predictions, especially for heavy leptons.

Contribution

It introduces the impact of scalar unparticles on Z boson decay branching ratios and analyzes their sensitivity to unparticle scaling dimensions.

Findings

Decays are sensitive to unparticle scaling dimension d_u for small values.

Scalar unparticles can affect lepton flavor conserving Z decays.

Potential explanation for experimental and standard model discrepancies.

Abstract

We predict the contribution of scalar unparticle to the branching ratios of the lepton flavor conserving Z -> l^+ l^- decays and we study the discrepancy between the experimental and the QED corrected standard model branching ratios. We observe that these decays are sensitive to the unparticle scaling dimension d_u for its small values, especially for heavy lepton flavor output.