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Cancellation of renormalon ambiguities in the heavy quark effective theory

Recently, it has been shown that the concept of the pole mass of a heavy quark becomes ambiguous beyond perturbation theory, because of the presence of infrared renormalons. We argue that the predictions of heavy quark effective theory, whose construction is based on the pole mass, are free of such...

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Detalles Bibliográficos
Autores principales: Neubert, M, Sachrajda, Christopher T C
Lenguaje:eng
Publicado: 1994
Materias:
Acceso en línea:https://dx.doi.org/10.1016/0550-3213(95)00032-N
http://cds.cern.ch/record/266663
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author Neubert, M
Sachrajda, Christopher T C
author_facet Neubert, M
Sachrajda, Christopher T C
author_sort Neubert, M
collection CERN
description Recently, it has been shown that the concept of the pole mass of a heavy quark becomes ambiguous beyond perturbation theory, because of the presence of infrared renormalons. We argue that the predictions of heavy quark effective theory, whose construction is based on the pole mass, are free of such ambiguities. In the 1/m_Q expansion of physical quantities, infrared and ultraviolet renormalons compensate each other between coefficient functions and matrix elements. We trace the appearance of these compensations for current-induced exclusive heavy-to-heavy and heavy-to-light transitions, and for inclusive decays of heavy hadrons. In particular, we show that the structure of the heavy quark expansion is not obscured by renormalons, and none of the predictions of heavy quark effective theory are invalidated.
id cern-266663
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1994
record_format invenio
spelling cern-2666632019-09-30T06:29:59Zdoi:10.1016/0550-3213(95)00032-Nhttp://cds.cern.ch/record/266663engNeubert, MSachrajda, Christopher T CCancellation of renormalon ambiguities in the heavy quark effective theoryParticle Physics - TheoryRecently, it has been shown that the concept of the pole mass of a heavy quark becomes ambiguous beyond perturbation theory, because of the presence of infrared renormalons. We argue that the predictions of heavy quark effective theory, whose construction is based on the pole mass, are free of such ambiguities. In the 1/m_Q expansion of physical quantities, infrared and ultraviolet renormalons compensate each other between coefficient functions and matrix elements. We trace the appearance of these compensations for current-induced exclusive heavy-to-heavy and heavy-to-light transitions, and for inclusive decays of heavy hadrons. In particular, we show that the structure of the heavy quark expansion is not obscured by renormalons, and none of the predictions of heavy quark effective theory are invalidated.hep-ph/9407394CERN-TH-7312-94SHEP-93-94-25oai:cds.cern.ch:2666631994-07-28
spellingShingle Particle Physics - Theory
Neubert, M
Sachrajda, Christopher T C
Cancellation of renormalon ambiguities in the heavy quark effective theory
title Cancellation of renormalon ambiguities in the heavy quark effective theory
title_full Cancellation of renormalon ambiguities in the heavy quark effective theory
title_fullStr Cancellation of renormalon ambiguities in the heavy quark effective theory
title_full_unstemmed Cancellation of renormalon ambiguities in the heavy quark effective theory
title_short Cancellation of renormalon ambiguities in the heavy quark effective theory
title_sort cancellation of renormalon ambiguities in the heavy quark effective theory
topic Particle Physics - Theory
url https://dx.doi.org/10.1016/0550-3213(95)00032-N
http://cds.cern.ch/record/266663
work_keys_str_mv AT neubertm cancellationofrenormalonambiguitiesintheheavyquarkeffectivetheory
AT sachrajdachristophertc cancellationofrenormalonambiguitiesintheheavyquarkeffectivetheory