Power corrections from decoupling of the charm quark

Decoupling of heavy quarks at low energies can be described by means of an effective theory as shown by S. Weinberg in Ref. [1] . We study the decoupling of the charm quark by lattice simulations. We simulate a model, QCD with two degenerate charm quarks. In this case the leading order term in the e...

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Detalles Bibliográficos
Autores principales: Knechtli, Francesco, Korzec, Tomasz, Leder, Björn, Moir, Graham
Lenguaje:eng
Publicado: 2017
Materias:
hep-lat
Particle Physics - Lattice
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2017.10.025
http://cds.cern.ch/record/2298187
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author Knechtli, Francesco
Korzec, Tomasz
Leder, Björn
Moir, Graham
author_facet Knechtli, Francesco
Korzec, Tomasz
Leder, Björn
Moir, Graham
author_sort Knechtli, Francesco
collection CERN
description Decoupling of heavy quarks at low energies can be described by means of an effective theory as shown by S. Weinberg in Ref. [1] . We study the decoupling of the charm quark by lattice simulations. We simulate a model, QCD with two degenerate charm quarks. In this case the leading order term in the effective theory is a pure gauge theory. The higher order terms are proportional to inverse powers of the charm quark mass M starting at M−2 . Ratios of hadronic scales are equal to their value in the pure gauge theory up to power corrections. We show, by precise measurements of ratios of scales defined from the Wilson flow, that these corrections are very small and that they can be described by a term proportional to M−2 down to masses in the region of the charm quark mass.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
record_format invenio
spelling cern-22981872022-06-30T10:35:13Zdoi:10.1016/j.physletb.2017.10.025doi:10.1016/j.physletb.2017.10.025http://cds.cern.ch/record/2298187engKnechtli, FrancescoKorzec, TomaszLeder, BjörnMoir, GrahamPower corrections from decoupling of the charm quarkhep-latParticle Physics - LatticeDecoupling of heavy quarks at low energies can be described by means of an effective theory as shown by S. Weinberg in Ref. [1] . We study the decoupling of the charm quark by lattice simulations. We simulate a model, QCD with two degenerate charm quarks. In this case the leading order term in the effective theory is a pure gauge theory. The higher order terms are proportional to inverse powers of the charm quark mass M starting at M−2 . Ratios of hadronic scales are equal to their value in the pure gauge theory up to power corrections. We show, by precise measurements of ratios of scales defined from the Wilson flow, that these corrections are very small and that they can be described by a term proportional to M−2 down to masses in the region of the charm quark mass.Decoupling of heavy quarks at low energies can be described by means of an effective theory as shown by S. Weinberg in Ref. [1]. We study the decoupling of the charm quark by lattice simulations. We simulate a model, QCD with two degenerate charm quarks. In this case the leading order term in the effective theory is a pure gauge theory. The higher order terms are proportional to inverse powers of the charm quark mass $M$ starting at $M^{-2}$. Ratios of hadronic scales are equal to their value in the pure gauge theory up to power corrections. We show, by precise measurements of ratios of scales defined from the Wilson flow, that these corrections are very small and that they can be described by a term proportional to $M^{-2}$ down to masses in the region of the charm quark mass.WUB-17-02HU-EP-17-15DAMTP-2017-22arXiv:1706.04982oai:cds.cern.ch:22981872017-06-15
spellingShingle hep-lat
Particle Physics - Lattice
Knechtli, Francesco
Korzec, Tomasz
Leder, Björn
Moir, Graham
Power corrections from decoupling of the charm quark
title Power corrections from decoupling of the charm quark
title_full Power corrections from decoupling of the charm quark
title_fullStr Power corrections from decoupling of the charm quark
title_full_unstemmed Power corrections from decoupling of the charm quark
title_short Power corrections from decoupling of the charm quark
title_sort power corrections from decoupling of the charm quark
topic hep-lat
Particle Physics - Lattice
url https://dx.doi.org/10.1016/j.physletb.2017.10.025
https://dx.doi.org/10.1016/j.physletb.2017.10.025
http://cds.cern.ch/record/2298187
work_keys_str_mv AT knechtlifrancesco powercorrectionsfromdecouplingofthecharmquark
AT korzectomasz powercorrectionsfromdecouplingofthecharmquark
AT lederbjorn powercorrectionsfromdecouplingofthecharmquark
AT moirgraham powercorrectionsfromdecouplingofthecharmquark

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