Two-loop next-to-leading m$_{t}$ corrections to the $\varrho$ parameter

The O(G^2_\mu m_t^4) correction to the \rho parameter is computed within the Standard Model using the current algebra formulation of radiative corrections. This approach is proved to be equivalent to the effective Lagrangian method proposed by Barbieri {\em et al.} Using the same framework, the O(G^...

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Detalles Bibliográficos
Autores principales: Degrassi, Giuseppe, Fanchiotti, Sergio, Gambino, Paolo
Lenguaje:eng
Publicado: 1995
Materias:
Particle Physics - Theory
Acceso en línea:https://dx.doi.org/10.1142/S0217751X95000668
http://cds.cern.ch/record/260268
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author Degrassi, Giuseppe
Fanchiotti, Sergio
Gambino, Paolo
author_facet Degrassi, Giuseppe
Fanchiotti, Sergio
Gambino, Paolo
author_sort Degrassi, Giuseppe
collection CERN
description The O(G^2_\mu m_t^4) correction to the \rho parameter is computed within the Standard Model using the current algebra formulation of radiative corrections. This approach is proved to be equivalent to the effective Lagrangian method proposed by Barbieri {\em et al.} Using the same framework, the O(G^2_\mu m_t^2 m_z^2) correction to the ratio of neutral-to-charged current amplitudes is analysed in an SU(2) model. The O(G^2_\mu m_t^2 m_z^2) contribution is shown to be numerically comparable to the leading O(G^2_\mu m_t^4) term for realistic values of the top mass. The resummation of higher-order effects is discussed.
id cern-260268
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1995
record_format invenio
spelling cern-2602682023-03-14T18:59:34Zdoi:10.1142/S0217751X95000668http://cds.cern.ch/record/260268engDegrassi, GiuseppeFanchiotti, SergioGambino, PaoloTwo-loop next-to-leading m$_{t}$ corrections to the $\varrho$ parameterParticle Physics - TheoryThe O(G^2_\mu m_t^4) correction to the \rho parameter is computed within the Standard Model using the current algebra formulation of radiative corrections. This approach is proved to be equivalent to the effective Lagrangian method proposed by Barbieri {\em et al.} Using the same framework, the O(G^2_\mu m_t^2 m_z^2) correction to the ratio of neutral-to-charged current amplitudes is analysed in an SU(2) model. The O(G^2_\mu m_t^2 m_z^2) contribution is shown to be numerically comparable to the leading O(G^2_\mu m_t^4) term for realistic values of the top mass. The resummation of higher-order effects is discussed.The $O(G~2_\mu m_t~4)$ correction to the $\rho$ parameter is computed within the Standard Model using the current algebra formulation of radiative corrections. This approach is proved to be equivalent to the effective Lagrangian method proposed by Barbieri {\em et al.} Using the same framework, the $O(G~2_\mu m_t~2 m_z~2)$ correction to the ratio of neutral-to-charged current amplitudes is analysed in an $SU(2)$ model. The $O(G~2_\mu m_t~2 m_z~2)$ contribution is shown to be numerically comparable to the leading $O(G~2_\mu m_t~4)$ term for realistic values of the top mass. The resummation of higher-order effects is discussed.The $O(G^2_\mu m_t^4)$ correction to the $\rho$ parameter is computed within the Standard Model using the current algebra formulation of radiative corrections. This approach is proved to be equivalent to the effective Lagrangian method proposed by Barbieri {\em et al.} Using the same framework, the $O(G^2_\mu m_t^2 m_z^2)$ correction to the ratio of neutral-to-charged current amplitudes is analysed in an $SU(2)$ model. The $O(G^2_\mu m_t^2 m_z^2)$ contribution is shown to be numerically comparable to the leading $O(G^2_\mu m_t^4)$ term for realistic values of the top mass. The resummation of higher-order effects is discussed.hep-ph/9403250CERN-TH-7180-94DFPD-94-TH-12NYU-TH-94-02-01CERN-TH-7180-94DFPD-94-TH-12NYU-TH-94-02-01oai:cds.cern.ch:2602681995
spellingShingle Particle Physics - Theory
Degrassi, Giuseppe
Fanchiotti, Sergio
Gambino, Paolo
Two-loop next-to-leading m$_{t}$ corrections to the $\varrho$ parameter
title Two-loop next-to-leading m$_{t}$ corrections to the $\varrho$ parameter
title_full Two-loop next-to-leading m$_{t}$ corrections to the $\varrho$ parameter
title_fullStr Two-loop next-to-leading m$_{t}$ corrections to the $\varrho$ parameter
title_full_unstemmed Two-loop next-to-leading m$_{t}$ corrections to the $\varrho$ parameter
title_short Two-loop next-to-leading m$_{t}$ corrections to the $\varrho$ parameter
title_sort two-loop next-to-leading m$_{t}$ corrections to the $\varrho$ parameter
topic Particle Physics - Theory
url https://dx.doi.org/10.1142/S0217751X95000668
http://cds.cern.ch/record/260268
work_keys_str_mv AT degrassigiuseppe twoloopnexttoleadingmtcorrectionstothevarrhoparameter
AT fanchiottisergio twoloopnexttoleadingmtcorrectionstothevarrhoparameter
AT gambinopaolo twoloopnexttoleadingmtcorrectionstothevarrhoparameter

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