ZZ' Mixing and Radiative Corrections at LEP I

Arnd Leike; Sabine Riemann; Tord Riemann

doi:10.1016/0370-2693(92)90142-Q

paper

ZZ' Mixing and Radiative Corrections at LEP I

arXiv:hep-ph/9507436 · doi:10.1016/0370-2693(92)90142-Q

Abstract

We present a method for a common treatment of $Z^{'}$ exchange, QED corrections, and weak loops in $e^{+} e^{-}$ annihilation. QED corrections are taken into account by convoluting a hard-scattering cross section containing $γ, Z,$ and $Z^{'}$ exchange. Weak corrections and $Z Z^{'}$ mixing are treated simultaneously by a generalization of weak form factors. Using the properly extended Standard Model program for the $Z$ line shape, ZFITTER, we perform and compare two different analyses of the 1990 LEP~I data in terms of theories based on the E $_{6}$ -group and in terms of LR-symmetric models. From the LEP~I data alone, the $Z Z^{'}$ mixing angle may be limited to $∣ θ_{M} ∣ \leq 0.01$ and the $Z^{'}$ mass to $M_{2} > 118$ --148 GeV, depending on the model (95\%~CL).

12 pages, LaTex, 4 figures, a uuencoded file containing the latex file and figures is available via anonymous ftp at ftp://ftp.ifh.de/pub/preprint/cernth92-6545.uu ; paper publ. in Phys. Lett. B291 (1992) 187

ZZ' Mixing and Radiative Corrections at LEP I

Abstract

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