Quark masses, isospin breaking and the vector piece of pi --> enugamma

The authors discuss a direct way to detect isospin breaking generated by the current quark mass matrix. With PCAC the vector form factor of pi to e nu gamma can be described by a pure current process. In the chiral symmetry limit they prove, to all orders in QCD, that xi =m/sub d//m/sub u/ zero or i...

Descripción completa

Detalles Bibliográficos
Autores principales: Bernabeu, J, Tarrach, Rolf, Ynduráin, F
Lenguaje:eng
Publicado: 1978
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/0370-2693(78)90407-0
http://cds.cern.ch/record/133007
_version_ 1780879476278689792
author Bernabeu, J
Tarrach, Rolf
Ynduráin, F
author_facet Bernabeu, J
Tarrach, Rolf
Ynduráin, F
author_sort Bernabeu, J
collection CERN
description The authors discuss a direct way to detect isospin breaking generated by the current quark mass matrix. With PCAC the vector form factor of pi to e nu gamma can be described by a pure current process. In the chiral symmetry limit they prove, to all orders in QCD, that xi =m/sub d//m/sub u/ zero or infinity induces a 50% isospin breaking in the physical amplitude. Detailed effects, as function of xi , are calculated from the quark triangle diagram. Experiments to look for this possible departure from isospin invariance are feasible. (15 refs).
id cern-133007
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1978
record_format invenio
spelling cern-1330072019-09-30T06:29:59Zdoi:10.1016/0370-2693(78)90407-0http://cds.cern.ch/record/133007engBernabeu, JTarrach, RolfYnduráin, FQuark masses, isospin breaking and the vector piece of pi --> enugammaParticle Physics - PhenomenologyThe authors discuss a direct way to detect isospin breaking generated by the current quark mass matrix. With PCAC the vector form factor of pi to e nu gamma can be described by a pure current process. In the chiral symmetry limit they prove, to all orders in QCD, that xi =m/sub d//m/sub u/ zero or infinity induces a 50% isospin breaking in the physical amplitude. Detailed effects, as function of xi , are calculated from the quark triangle diagram. Experiments to look for this possible departure from isospin invariance are feasible. (15 refs).CERN-TH-2551oai:cds.cern.ch:1330071978-08-22
spellingShingle Particle Physics - Phenomenology
Bernabeu, J
Tarrach, Rolf
Ynduráin, F
Quark masses, isospin breaking and the vector piece of pi --> enugamma
title Quark masses, isospin breaking and the vector piece of pi --> enugamma
title_full Quark masses, isospin breaking and the vector piece of pi --> enugamma
title_fullStr Quark masses, isospin breaking and the vector piece of pi --> enugamma
title_full_unstemmed Quark masses, isospin breaking and the vector piece of pi --> enugamma
title_short Quark masses, isospin breaking and the vector piece of pi --> enugamma
title_sort quark masses, isospin breaking and the vector piece of pi --> enugamma
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/0370-2693(78)90407-0
http://cds.cern.ch/record/133007
work_keys_str_mv AT bernabeuj quarkmassesisospinbreakingandthevectorpieceofpienugamma
AT tarrachrolf quarkmassesisospinbreakingandthevectorpieceofpienugamma
AT yndurainf quarkmassesisospinbreakingandthevectorpieceofpienugamma

Ejemplares similares