dc.contributor.author | Sint, Stefan | en |
dc.contributor.author | Fritzsch, Patrick | en |
dc.date.accessioned | 2017-01-13T11:19:31Z | |
dc.date.available | 2017-01-13T11:19:31Z | |
dc.date.issued | 2016 | en |
dc.date.submitted | 2016 | en |
dc.identifier.citation | Dalla Brida M, Fritzsch P, Korzec T, Ramos A, Sint S, Sommer R, Determination of the QCD ? Parameter and the Accuracy of Perturbation Theory at High Energies, Physical Review Letters, 117, 18, 2016, 182001- | en |
dc.identifier.other | Y | en |
dc.identifier.uri | http://hdl.handle.net/2262/78718 | |
dc.description | PUBLISHED | en |
dc.description | Export Date: 6 January 2017 | en |
dc.description.abstract | We discuss the determination of the strong coupling
α
MS
ð
m
Z
Þ
or, equivalently, the QCD
Λ
parameter. Its
determination requires the use of perturbation theory in
α
s
ð
μ
Þ
in some scheme
s
and at some energy scale
μ
.
The higher the scale
μ
, the more accurate perturbation theory becomes, owing to asymptotic freedom. As
one step in our computation of the
Λ
parameter in three-flavor QCD, we perform lattice computations in a
scheme that allows us to nonperturbatively reach very high energies, corresponding to
α
s
¼
0
.
1
and below.
We find that (continuum) perturbation theory is very accurate there, yielding a 3% error in the
Λ
parameter,
while data around
α
s
≈
0
.
2
are clearly insufficient to quote such a precision. It is important to realize that
these findings are expected to be generic, as our scheme has advantageous properties regarding the
applicability of perturbation theory. | en |
dc.description.sponsorship | We thank our colleagues in the ALPHA Collaboration, in
particular M. Bruno, C. Pena, S. Schaefer, H. Simma, and
U. Wolff, for many useful discussions. We thank U. Wolff
for a critical reading of the manuscript. We would also like
to show our gratitude to S. Schaefer and H. Simma for their
invaluable contribution in adapting the
O
pen
QCD
code. We
thank the computer centers at HLRN (bep00040) and NIC
at DESY, Zeuthen for providing computing resources and
support. S. S. acknowledges support by Science
Foundation Ireland (SFI) under Grant No. 11/RFP/
PHY3218. P. F. acknowledges financial support from the
Spanish Ministerio de Economía y Competitividad
(MINECO
’
s)
“
Centro de Excelencia Severo Ochoa
”
Programme under Grant No. SEV-2012-0249, as well as
from the Ministerio de Ciencia e Innovación (MCINN)
Grant No. FPA2012-31686. This work is based on previous
work supported by the Deutsche Forschungsgemeinschaft
in the SFB/TR 09. | en |
dc.format.extent | 182001 | en |
dc.relation.ispartofseries | Physical Review Letters | en |
dc.relation.ispartofseries | 117 | en |
dc.relation.ispartofseries | 18 | en |
dc.rights | Y | en |
dc.subject | accurate perturbation theory | en |
dc.subject.lcsh | accurate perturbation theory | en |
dc.title | Determination of the QCD ? Parameter and the Accuracy of Perturbation Theory at High Energies | en |
dc.type | Journal Article | en |
dc.type.supercollection | scholarly_publications | en |
dc.type.supercollection | refereed_publications | en |
dc.identifier.peoplefinderurl | http://people.tcd.ie/sints | en |
dc.identifier.peoplefinderurl | http://people.tcd.ie/fritzscp | en |
dc.identifier.rssinternalid | 141097 | en |
dc.identifier.doi | http://dx.doi.org/10.1103/PhysRevLett.117.182001 | en |
dc.rights.ecaccessrights | openAccess | |
dc.identifier.rssuri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84994659855&doi=10.1103%2fPhysRevLett.117.182001&partnerID=40&md5=0701b9cdc1f1ac110004fe7fde50aa39 | en |
dc.identifier.orcid_id | 0000-0001-7007-2980 | en |