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)


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