Rare decay Z \to \nu\bar{\nu}\gamma\gamma via tensor unparticle mediation

TL;DR

This paper investigates how tensor unparticles could contribute to the rare decay Z o uar{ u}\gamma\gamma, using experimental data to constrain unparticle couplings and enhance understanding of potential new physics effects.

Contribution

It provides the first calculation of tensor unparticle effects on the Z o uar{ u}\gamma\gamma decay and derives constraints on unparticle couplings from LEP data.

Findings

Tensor unparticles can contribute at tree level to the decay.

Experimental data constrains unparticle couplings to neutrinos, Z bosons, and photons.

Results limit the strength of unparticle interactions in this decay channel.

Abstract

The decay width of the rare decay Z \to \nu\bar{\nu}\gamma\gamma is strictly constrained from the LEP data. Tensor unparticles provide a tree-level contribution to this rare decay. We have calculated the tensor unparticle contribution to the rare decay Z\to \nu\bar{\nu}\gamma\gamma. The current experimental limit have been used to constrain unparticle couplings \nu\bar{\nu}Z {U}^{\mu\nu} and \gamma\gamma {U}^{\mu\nu}.