Decay of Z Boson into Photon and Unparticle

Abstract

We study the decay of the standard model Z boson into unparticle plus a single photon through a one-loop process. As in the anomaly type decay, only the axial-vector part of the Z coupling matching with the vector unparticle and/or the vector part of the Z coupling matching with the axial-vector unparticle can give a nonzero contribution to the decay. We show that the photon spectrum terminates at the end point in accord with Yang's theorem. Existing data on single photon production at LEP I is used to constrain the unparticle sector.

12 pages, 2 figures plus 1 table

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• Unparticle Effects on Unitarity Constraints from Higgs Boson Scattering
• The decay rate of $\psi (2S)$ to ${\Lambda }_c+\overline{{\Sigma }^{+}}$ in SM and beyond
• Unparticle effects in rare (t -> c g g) decay
• On decays of Z' into unparticle stuff