Limits on an additional Z boson from e+e- annihilation data

K. Hagiwara, R. Najima, M. Sakuda, N. Terunuma

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


We study the possibilities of an extra Z boson expected from E6 grand unified theories by using the most recent e+e- annihilation data up to s =57 GeV. Limits on the mass and mixing angle for the extra Z boson are discussed. We find that the data fit well for an extra Z boson whose mass is in the range 100400 GeV and which has an appreciable vector coupling to charged leptons and down-type quarks. The upper mass bound is marginal such that it disappears at the 2 level even for the most favorable model (Z).

Original languageEnglish
Pages (from-to)815-823
Number of pages9
JournalPhysical Review D
Issue number3
Publication statusPublished - 1990

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Limits on an additional Z boson from e+e- annihilation data'. Together they form a unique fingerprint.

Cite this