Improved constraints on Z′ bosons from electroweak precision data

Jens Erler, Paul Langacker, Shoaib Munir, Eduardo Rojas

Research output: Contribution to journalArticlepeer-review

201 Scopus citations


We analyze various models with an extra U(1) gauge symmetry in addition to the Standard Model (SM) gauge group at low energies, and impose limits on the mass of the neutral Z′ boson, M Z′, predicted in all such models, and on the Z-Z′ mixing angle, θ ZZ′. The precision electroweak (EW) data strongly constrain θ ZZ′ to very small values and for most models we find lower limits on M Z′ of (1TeV). In one case we obtain a somewhat better fit than in the SM (although this is only marginally statistically significant) and here we find a weak upper limit at the 90% C.L.

Original languageEnglish (US)
Article number017
JournalJournal of High Energy Physics
Issue number8
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


  • Beyond standard model
  • GUT
  • Standard model


Dive into the research topics of 'Improved constraints on Z′ bosons from electroweak precision data'. Together they form a unique fingerprint.

Cite this