Bloch-Nordsieck Violation in Spontaneously Broken Abelian Theories

We point out that, in a spontaneously broken U(1) gauge theory, inclusive processes, whose primary particles are mass eigenstates that do not coincide with the gauge eigenstates, are not free of infrared logarithms. The charge mixing allowed by symmetry breaking and the ensuing Bloch-Nordsieck viola...

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Detalles Bibliográficos
Autores principales: Ciafaloni, Marcello, Ciafaloni, Paolo, Comelli, Denis
Lenguaje:eng
Publicado: 2001
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.87.211802
http://cds.cern.ch/record/493242
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author Ciafaloni, Marcello
Ciafaloni, Paolo
Comelli, Denis
author_facet Ciafaloni, Marcello
Ciafaloni, Paolo
Comelli, Denis
author_sort Ciafaloni, Marcello
collection CERN
description We point out that, in a spontaneously broken U(1) gauge theory, inclusive processes, whose primary particles are mass eigenstates that do not coincide with the gauge eigenstates, are not free of infrared logarithms. The charge mixing allowed by symmetry breaking and the ensuing Bloch-Nordsieck violation are here analyzed in a few relevant cases and in particular for processes initiated by longitudinal gauge bosons. Of particular interest is the example of weak hypercharge in the Standard Model where, in addition, left-right mixing effects arise in transversely polarized fermion beams.
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institution Organización Europea para la Investigación Nuclear
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publishDate 2001
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spelling cern-4932422023-03-14T20:12:36Zdoi:10.1103/PhysRevLett.87.211802http://cds.cern.ch/record/493242engCiafaloni, MarcelloCiafaloni, PaoloComelli, DenisBloch-Nordsieck Violation in Spontaneously Broken Abelian TheoriesParticle Physics - PhenomenologyWe point out that, in a spontaneously broken U(1) gauge theory, inclusive processes, whose primary particles are mass eigenstates that do not coincide with the gauge eigenstates, are not free of infrared logarithms. The charge mixing allowed by symmetry breaking and the ensuing Bloch-Nordsieck violation are here analyzed in a few relevant cases and in particular for processes initiated by longitudinal gauge bosons. Of particular interest is the example of weak hypercharge in the Standard Model where, in addition, left-right mixing effects arise in transversely polarized fermion beams.We point out that, in a spontaneously broken U(1) gauge theory, inclusive processes, whose primary particles are mass eigenstates that do not coincide with the gauge eigenstates, are not free of infrared logarithms. The charge mixing allowed by symmetry breaking and the ensuing Bloch-Nordsieck violation are here analyzed in a few relevant cases and in particular for processes initiated by longitudinal gauge bosons. Of particular interest is the example of weak hypercharge in the Standard Model where, in addition, left-right mixing effects arise in transversely polarized fermion beams.hep-ph/0103315CERN-TH-2001-138oai:cds.cern.ch:4932422001-03-29
spellingShingle Particle Physics - Phenomenology
Ciafaloni, Marcello
Ciafaloni, Paolo
Comelli, Denis
Bloch-Nordsieck Violation in Spontaneously Broken Abelian Theories
title Bloch-Nordsieck Violation in Spontaneously Broken Abelian Theories
title_full Bloch-Nordsieck Violation in Spontaneously Broken Abelian Theories
title_fullStr Bloch-Nordsieck Violation in Spontaneously Broken Abelian Theories
title_full_unstemmed Bloch-Nordsieck Violation in Spontaneously Broken Abelian Theories
title_short Bloch-Nordsieck Violation in Spontaneously Broken Abelian Theories
title_sort bloch-nordsieck violation in spontaneously broken abelian theories
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevLett.87.211802
http://cds.cern.ch/record/493242
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AT ciafalonipaolo blochnordsieckviolationinspontaneouslybrokenabeliantheories
AT comellidenis blochnordsieckviolationinspontaneouslybrokenabeliantheories

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