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Closed Access item μ-e conversion in nuclei and Z' physics

Authors:Bernabéu, José
Nardi, Enrico
Tommasini, Daniele
Keywords:Elementary Particles, Particle Physics, Theoretical Physics
Issue Date:22-Nov-1993
Publisher:Elsevier
Citation:Nuclear Physics B 409(1): 69-86
<http://hdl.handle.net/2027.42/30445>
http://www.sciencedirect.com/science/article/B6TVC-4719VT3-2P1/2/9966d03cfd3e8dade1d48b51f63ba2cb
Abstract:Together with the existence of new neutral gauge bosons, models based on extended gauge groups (rank > 4) often predict also new charged fermions. A mixing of the known fermions with new states with exotic weak-isospin assignments (left-handed singlets and right-handed doublets) will induce tree level flavour changing neutral interactions mediated by Z exchange, while if the mixing is only with new states with ordinary weak-isospin assignments, the flavour changing neutral currents are mainly due to the exchange of the lightest new neutral gauge boson Z'. We show that the present experimental limits on μ-e conversion in nuclei give a nuclear-model-independent bound on the Z-e-μ vertex which is twice as strong as that obtained from μ --> eee. In the case of E6 models these limits provide quite stringent constraints on the Z' mass and on the Z-Z' mixing angle. We point out that the proposed experiments to search for μ-e conversion in nuclei have good chances to find evidence of lepton flavour violation, either in the case that new exotic fermions are present at the electroweak scale, or if a new neutral gauge boson Z' of E6 origin lighter than a few TeV exists.
URI:http://hdl.handle.net/10261/2565
???metadata.dc.identifier.doi???:10.1016/0550-3213(93)90446-V
Appears in Collections:(IFIC) Artículos

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