Resummation for (boosted) top-quark pair production at NNLO-ENNLL′ in QCD

Publication type:
Journal article
Metadata:
Autoren
  • Michal Czakon
  • Andrea Ferroglia
  • David Heymes
  • Alexander Mitov
  • Ben D Pecjak
  • Darren J Scott
  • Xing Wang
  • Li Lin Yang
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000433262800002&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1007/JHEP05(2018)149
Externe Identifier
  • Clarivate Analytics Document Solution ID: GH2WN
ISSN
1029-8479
Ausgabe der Veröffentlichung
5
Zeitschrift
JOURNAL OF HIGH ENERGY PHYSICS
Schlüsselwörter
  • QCD Phenomenology
Artikelnummer
ARTN 149
Datum der Veröffentlichung
2018
Status
Published
Titel
Resummation for (boosted) top-quark pair production at NNLO-ENNLL′ in QCD
Sub types
  • Article

Data source: Web of Science (Lite)

Other metadata sources:
Abstract
<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>We construct predictions for top quark pair differential distributions at hadron colliders that combine state-of-the-art NNLO QCD calculations with double resummation at NNLL<jats:sup>′</jats:sup> accuracy of threshold logarithms arising from soft gluon emissions and of small mass logarithms. This is the first time a resummed calculation at full NNLO+NNLL<jats:sup>′</jats:sup> accuracy in QCD for a process with non-trivial color structure has been completed at the differential level. Of main interest to us is the stability of the <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ {M}_{t\overline{t}} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>M</mml:mi> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:mrow> </mml:msub> </mml:math> </jats:alternatives> </jats:inline-formula> and top-quark <jats:italic>p</jats:italic> <jats:sub> <jats:italic>T</jats:italic> </jats:sub> distributions in the boosted regime where fixed order calculations may become strongly dependent on the choice of dynamic scales. With the help of numeric and analytic arguments we confirm that the choice for the factorization and renormalization scales advocated recently by some of the authors is indeed optimal. We further derive a set of optimized kinematics-dependent scales for the matching functions which appear in the resummed calculations. Our NNLO+NNLL<jats:sup>′</jats:sup> prediction for the top-pair invariant mass is significantly less sensitive to the choice of factorization scale than the fixed order prediction, even at NNLO. Notably, the resummed and fixed order calculations are in nearly perfect agreement with each other in the full <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ {M}_{t\overline{t}} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>M</mml:mi> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:mrow> </mml:msub> </mml:math> </jats:alternatives> </jats:inline-formula> range when the optimal dynamic scale is used. For the top-quark <jats:italic>p</jats:italic> <jats:sub> <jats:italic>T</jats:italic> </jats:sub> distribution the resummation performed here has less of an impact and instead we find that upgrading the matching with fixed-order from NLO+NNLL<jats:sup>′</jats:sup> to NNLO+NNLL<jats:sup>′</jats:sup> to be an important effect, a point to be kept in mind when using NLO-based Monte Carlo event generators to calculate this distribution.</jats:p>
Autoren
  • Michal Czakon
  • Andrea Ferroglia
  • David Heymes
  • Alexander Mitov
  • Ben D Pecjak
  • Darren J Scott
  • Xing Wang
  • Li Lin Yang
DOI
10.1007/jhep05(2018)149
eISSN
1029-8479
Ausgabe der Veröffentlichung
5
Zeitschrift
Journal of High Energy Physics
Sprache
en
Artikelnummer
149
Online publication date
2018
Datum der Veröffentlichung
2018
Status
Published
Herausgeber
Springer Science and Business Media LLC
Herausgeber URL
http://dx.doi.org/10.1007/jhep05(2018)149
Datum der Datenerfassung
2021
Titel
Resummation for (boosted) top-quark pair production at NNLO+NNLL′ in QCD
Ausgabe der Zeitschrift
2018

Data source: Crossref

Abstract
We construct predictions for top quark pair differential distributions at hadron colliders that combine state-of-the-art NNLO QCD calculations with double resummation at NNLL' accuracy of threshold logarithms arising from soft gluon emissions and of small mass logarithms. This is the first time a resummed calculation at full NNLO+NNLL' accuracy in QCD for a process with non-trivial color structure has been completed at the differential level. Of main interest to us is the stability of the M_{tt} and top-quark p_T distributions in the boosted regime where fixed order calculations may become strongly dependent on the choice of dynamic scales. With the help of numeric and analytic arguments we confirm that the choice for the factorization and renormalization scales advocated recently by some of the authors is indeed optimal. We further derive a set of optimized kinematics-dependent scales for the matching functions which appear in the resummed calculations. Our NNLO+NNLL' prediction for the top-pair invariant mass is significantly less sensitive to the choice of factorization scale than the fixed order prediction, even at NNLO. Notably, the resummed and fixed order calculations are in nearly perfect agreement with each other in the full M_{tt} range when the optimal dynamic scale is used. For the top-quark p_T distribution the resummation performed here has less of an impact and instead we find that upgrading the matching with fixed-order from NLO+NNLL' to NNLO+NNLL' to be an important effect, a point to be kept in mind when using NLO-based Monte Carlo event generators to calculate this distribution.
Autoren
  • Michal Czakon
  • Andrea Ferroglia
  • David Heymes
  • Alexander Mitov
  • Ben D Pecjak
  • Darren J Scott
  • Xing Wang
  • Li Lin Yang
Autoren-URL
http://arxiv.org/abs/1803.07623v2
Zeitschrift
JHEP
Schlüsselwörter
  • hep-ph
  • hep-ph
  • hep-ex
Notes
45 pages, 12 figures, 2 tables. Updated formatting and included a new appendix. Matches journal version
Paginierung
149
Datum der Veröffentlichung
2018
Herausgeber URL
http://dx.doi.org/10.1007/JHEP05(2018)149
Datum der Datenerfassung
2018
Datum, an dem der Datensatz öffentlich gemacht wurde
2018
Titel
Resummation for (boosted) top-quark pair production at NNLO+NNLL' in QCD
Ausgabe der Zeitschrift
1805

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1803.07623v2.pdf

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