Four-Loop Anomalous Dimensions for Radiative Flavour-Changing Decays

We evaluate the complete four-loop anomalous dimension matrix that is necessary for determining the effective flavour-changing neutral current couplings qbar-q'-gamma and qbar-q'-g at the next-to-next-to-leading order in QCD. The resulting O(alpha_s^2(mu_b)) correction to the B -> X_s g...

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Detalles Bibliográficos
Autores principales: Czakon, M, Haisch, U, Misiak, M
Lenguaje:eng
Publicado: 2006
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1088/1126-6708/2007/03/008
http://cds.cern.ch/record/1007759
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author Czakon, M
Haisch, U
Misiak, M
author_facet Czakon, M
Haisch, U
Misiak, M
author_sort Czakon, M
collection CERN
description We evaluate the complete four-loop anomalous dimension matrix that is necessary for determining the effective flavour-changing neutral current couplings qbar-q'-gamma and qbar-q'-g at the next-to-next-to-leading order in QCD. The resulting O(alpha_s^2(mu_b)) correction to the B -> X_s gamma branching ratio amounts to around -2.9% for mu_b = 5 GeV, and -4.4% for mu_b = 2.5 GeV
id cern-1007759
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2006
record_format invenio
spelling cern-10077592019-09-30T06:29:59Zdoi:10.1088/1126-6708/2007/03/008http://cds.cern.ch/record/1007759engCzakon, MHaisch, UMisiak, MFour-Loop Anomalous Dimensions for Radiative Flavour-Changing DecaysParticle Physics - PhenomenologyWe evaluate the complete four-loop anomalous dimension matrix that is necessary for determining the effective flavour-changing neutral current couplings qbar-q'-gamma and qbar-q'-g at the next-to-next-to-leading order in QCD. The resulting O(alpha_s^2(mu_b)) correction to the B -> X_s gamma branching ratio amounts to around -2.9% for mu_b = 5 GeV, and -4.4% for mu_b = 2.5 GeVhep-ph/0612329CERN-PH-TH-2006-271IFT-2006-23ZU-TH-2006-25oai:cds.cern.ch:10077592006-12-27
spellingShingle Particle Physics - Phenomenology
Czakon, M
Haisch, U
Misiak, M
Four-Loop Anomalous Dimensions for Radiative Flavour-Changing Decays
title Four-Loop Anomalous Dimensions for Radiative Flavour-Changing Decays
title_full Four-Loop Anomalous Dimensions for Radiative Flavour-Changing Decays
title_fullStr Four-Loop Anomalous Dimensions for Radiative Flavour-Changing Decays
title_full_unstemmed Four-Loop Anomalous Dimensions for Radiative Flavour-Changing Decays
title_short Four-Loop Anomalous Dimensions for Radiative Flavour-Changing Decays
title_sort four-loop anomalous dimensions for radiative flavour-changing decays
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1088/1126-6708/2007/03/008
http://cds.cern.ch/record/1007759
work_keys_str_mv AT czakonm fourloopanomalousdimensionsforradiativeflavourchangingdecays
AT haischu fourloopanomalousdimensionsforradiativeflavourchangingdecays
AT misiakm fourloopanomalousdimensionsforradiativeflavourchangingdecays

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