ZZ' mixing and radiative corrections at LEP I

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...

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Detalles Bibliográficos
Autores principales: Leike, A., Riemann, S., Riemann, T.
Lenguaje:eng
Publicado: 1992
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/0370-2693(92)90142-Q
http://cds.cern.ch/record/238898
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author Leike, A.
Riemann, S.
Riemann, T.
author_facet Leike, A.
Riemann, S.
Riemann, T.
author_sort Leike, A.
collection CERN
description 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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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1992
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spelling cern-2388982023-03-14T18:53:11Zdoi:10.1016/0370-2693(92)90142-Qhttp://cds.cern.ch/record/238898engLeike, A.Riemann, S.Riemann, T.ZZ' mixing and radiative corrections at LEP IParticle Physics - PhenomenologyWe 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).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 LEPI data in terms of theories based on the E$_6$-group and in terms of LR-symmetric models. From the LEPI 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).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 LEPI data in terms of theories based on the E$_6$-group and in terms of LR-symmetric models. From the LEPI 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).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 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 LR-symmetric models. From the LEP I data alone, the ZZ ′ mixing angle may be limited to | θ M | ⩽ 0.01 and the Z ′ mass to M 2 > 118–148 GeV, in dependence of the model (95% CL).hep-ph/9507436CERN-TH-6545-92CERN-TH-6545-92oai:cds.cern.ch:2388981992
spellingShingle Particle Physics - Phenomenology
Leike, A.
Riemann, S.
Riemann, T.
ZZ' mixing and radiative corrections at LEP I
title ZZ' mixing and radiative corrections at LEP I
title_full ZZ' mixing and radiative corrections at LEP I
title_fullStr ZZ' mixing and radiative corrections at LEP I
title_full_unstemmed ZZ' mixing and radiative corrections at LEP I
title_short ZZ' mixing and radiative corrections at LEP I
title_sort zz' mixing and radiative corrections at lep i
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/0370-2693(92)90142-Q
http://cds.cern.ch/record/238898
work_keys_str_mv AT leikea zzmixingandradiativecorrectionsatlepi
AT riemanns zzmixingandradiativecorrectionsatlepi
AT riemannt zzmixingandradiativecorrectionsatlepi

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