Non-perturbative tests of continuum HQET through small-volume two-flavour QCD
Entity
UAM. Departamento de Física TeóricaPublisher
Springer Verlag; SISSADate
2016-01-18Citation
10.1007/JHEP01(2016)093
Journal of High Energy Physics 2016.1 (2016): 093
ISSN
1029-8479 (online); 1126-6708 (print)DOI
10.1007/JHEP01(2016)093Funded by
We are grateful to M. Della Morte, D. Hesse and M. Serritiello for providing the treelevel improvement coefficients entering into some of our results. We also would like to thank R. Sommer for fruitful discussions and a critical reading of an earlier version of this manuscript. This work is part of the ALPHA Collaboration research programme. We thank NIC/DESY, INFN and the ZIV of the University of Münster for allocating computer time on the APE computers, the PAX Cluster and the PALMA HPC Cluster to this project, respectively, as well as the staff of the computer centers at Zeuthen, Rome and Münster for their support. We acknowledge partial support by the European Community through EU Contract No. MRTN-CT-2006-035482, “FLAVIAnet”. This work was also supported by the grants HE 4517/2-1 (P. F. and J. H.) and HE 4517/3-1 (J. H.) of the Deutsche Forschungsgemeinschaft. N. G. is funded by the Leverhulme Trust, research grant RPG2014-118. Finally, P. F. thanks the organizers and participants of the workshop “Highprecision QCD at low energy” at the “Centro de Ciencias de Benasque Pedro Pascual” for stimulating discussions and commentsProject
info:eu-repo/grantAgreement/EC/35482Editor's Version
http://dx.doi.org/10.1007/JHEP01(2016)093Subjects
Lattice QCD; Effective field theories; Nonperturbative effects; Heavy quark physics; FísicaNote
Journal of High Energy Physics 2016.1 (2016): 093 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)Rights
© 2016, The Author(s)Abstract
We study the heavy quark mass dependence of selected observables constructed from heavy-light meson correlation functions in small-volume two-flavour lattice QCD after taking the continuum limit. The light quark mass is tuned to zero, whereas the range of available heavy quark masses mh covers a region extending from around the charm to beyond the bottom quark mass scale. This allows entering the asymptotic mass-scaling regime as 1/mh → 0 and performing well-controlled extrapolations to the infinite-mass limit. Our results are then compared to predictions obtained in the static limit of continuum Heavy Quark Effective Theory (HQET), in order to verify non-perturbatively that HQET is an effective theory of QCD. While in general we observe a nice agreement at the per cent level, we find it to be less convincing for the small-volume pseudoscalar decay constant when perturbative matching is involved
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Google Scholar:Fritzsch, Patrick
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Garron, Nicolas
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Heitger, Jochen
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ALPHA Collaboration
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