ZZ' Mixing and Radiative Corrections at LEP I

Details ZZ' Mixing and Radiative Corrections at LEP I ZZ' Mixing and Radiative Corrections at LEP I

1995-07-27

arxiv.org/abs/hep-ph/9507436v1

Phys.Lett. B291 (1992) 187-194

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, LaTex, 4 figures, a uuencoded file containing the latex file and figures is available via anonymous ftp at ftp://f

Scientific paper

10.1016/0370-2693(92)90142-Q

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 $\gamma,\ Z,$ and $Z'$ exchange. Weak corrections and $ZZ'$ 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 $ZZ'$ mixing angle may be limited to $|\theta_M| \le 0.01$ and the $Z'$ mass to $M_2 > 118$--148 GeV, depending on the model (95\%~CL).

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