Elimination of Threshold Singularities in the Relation Between On-Shell and Pole Widths

In a previous communication by two of us, Phys. Rev. Lett. 81, 1373 (1998), the gauge-dependent deviations of the on-shell mass and total decay width from their gauge-independent pole counterparts were investigated at leading order for the Higgs boson of the Standard Model. In the case of the widths...

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Detalles Bibliográficos
Autores principales: Kniehl, Bernd A., Palisoc, Caesar P., Sirlin, Alberto
Lenguaje:eng
Publicado: 2002
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.66.057902
http://cds.cern.ch/record/554609
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author Kniehl, Bernd A.
Palisoc, Caesar P.
Sirlin, Alberto
author_facet Kniehl, Bernd A.
Palisoc, Caesar P.
Sirlin, Alberto
author_sort Kniehl, Bernd A.
collection CERN
description In a previous communication by two of us, Phys. Rev. Lett. 81, 1373 (1998), the gauge-dependent deviations of the on-shell mass and total decay width from their gauge-independent pole counterparts were investigated at leading order for the Higgs boson of the Standard Model. In the case of the widths, the deviation was found to diverge at unphysical thresholds, m_H = 2 root{xi_V} m_V (V = W,Z), in the R_xi gauge. In this Brief Report, we demonstrate that these unphysical threshold singularities are properly eliminated if a recently proposed definition of wave-function renormalization for unstable particles is invoked.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2002
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spelling cern-5546092023-03-14T16:59:55Zdoi:10.1103/PhysRevD.66.057902http://cds.cern.ch/record/554609engKniehl, Bernd A.Palisoc, Caesar P.Sirlin, AlbertoElimination of Threshold Singularities in the Relation Between On-Shell and Pole WidthsParticle Physics - PhenomenologyIn a previous communication by two of us, Phys. Rev. Lett. 81, 1373 (1998), the gauge-dependent deviations of the on-shell mass and total decay width from their gauge-independent pole counterparts were investigated at leading order for the Higgs boson of the Standard Model. In the case of the widths, the deviation was found to diverge at unphysical thresholds, m_H = 2 root{xi_V} m_V (V = W,Z), in the R_xi gauge. In this Brief Report, we demonstrate that these unphysical threshold singularities are properly eliminated if a recently proposed definition of wave-function renormalization for unstable particles is invoked.In a previous communication by two of us, Phys. Rev. Lett. 81, 1373 (1998), the gauge-dependent deviations of the on-shell mass and total decay width from their gauge-independent pole counterparts were investigated at leading order for the Higgs boson of the Standard Model. In the case of the widths, the deviation was found to diverge at unphysical thresholds, m_H = 2 root{xi_V} m_V (V = W,Z), in the R_xi gauge. In this Brief Report, we demonstrate that these unphysical threshold singularities are properly eliminated if a recently proposed definition of wave-function renormalization for unstable particles is invoked.hep-ph/0205304CERN-TH-2002-113DESY-02-073CERN-TH-2002-113DESY-02-073DESY-2002-073oai:cds.cern.ch:5546092002-05-27
spellingShingle Particle Physics - Phenomenology
Kniehl, Bernd A.
Palisoc, Caesar P.
Sirlin, Alberto
Elimination of Threshold Singularities in the Relation Between On-Shell and Pole Widths
title Elimination of Threshold Singularities in the Relation Between On-Shell and Pole Widths
title_full Elimination of Threshold Singularities in the Relation Between On-Shell and Pole Widths
title_fullStr Elimination of Threshold Singularities in the Relation Between On-Shell and Pole Widths
title_full_unstemmed Elimination of Threshold Singularities in the Relation Between On-Shell and Pole Widths
title_short Elimination of Threshold Singularities in the Relation Between On-Shell and Pole Widths
title_sort elimination of threshold singularities in the relation between on-shell and pole widths
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.66.057902
http://cds.cern.ch/record/554609
work_keys_str_mv AT kniehlbernda eliminationofthresholdsingularitiesintherelationbetweenonshellandpolewidths
AT palisoccaesarp eliminationofthresholdsingularitiesintherelationbetweenonshellandpolewidths
AT sirlinalberto eliminationofthresholdsingularitiesintherelationbetweenonshellandpolewidths

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