Resummed Differential Cross Sections for Top-Quark Pairs at the LHC

Pecjak, Benjamin D.; Scott, Darren J.; Wang, Xing; Yang, Li Lin

doi:10.1103/physrevlett.116.202001

Cited by 32 publications

(61 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even for an m tt -based scale that is as small as m tt /4 the deviation between the absolute predictions is large and exceeds the size of the scale error. Such scales have been used in the past [38,39] as well as recently in the resummation-based work [40,41]. Our findings seem to indicate that the large corrections found in refs.…”

Section: Jhep04(2017)071supporting

confidence: 68%

“…(3.4) below. Scales based on m T (3.2) have been used since the early days of NLO calculations [30,31,36,37], as well as, more recently, m tt -based scales [38][39][40][41].…”

Section: Jhep04(2017)071mentioning

confidence: 99%

“…Our findings seem to indicate that the large corrections found in refs. [40,41] JHEP04 (2017) are actually due to the particular scale choice. It will be interesting to check if a different scale choice (like, for example, H T /4) will lead to much smaller resummation corrections.…”

Section: Jhep04(2017)071mentioning

confidence: 99%

See 2 more Smart Citations

Dynamical scales for multi-TeV top-pair production at the LHC

Czakon

Heymes

Mitov

2017

J. High Energ. Phys.

139

156

View full text Add to dashboard Cite

We calculate all major differential distributions with stable top-quarks at the LHC. The calculation covers the multi-TeV range that will be explored during LHC Run II and beyond. Our results are in the form of high-quality binned distributions. We offer predictions based on three different parton distribution function (pdf) sets. In the near future we will make our results available also in the more flexible fastNLO format that allows fast re-computation with any other pdf set. In order to be able to extend our calculation into the multi-TeV range we have had to derive a set of dynamic scales. Such scales are selected based on the principle of fastest perturbative convergence applied to the differential and inclusive cross-section. Many observations from our study are likely to be applicable and useful to other precision processes at the LHC. With scale uncertainty now under good control, pdfs arise as the leading source of uncertainty for TeV top production. Based on our findings, true precision in the boosted regime will likely only be possible after new and improved pdf sets appear. We expect that LHC top-quark data will play an important role in this process.

show abstract

Section: Jhep04(2017)071supporting

confidence: 68%

“…(3.4) below. Scales based on m T (3.2) have been used since the early days of NLO calculations [30,31,36,37], as well as, more recently, m tt -based scales [38][39][40][41].…”

Section: Jhep04(2017)071mentioning

confidence: 99%

See 1 more Smart Citation

Dynamical scales for multi-TeV top-pair production at the LHC

Czakon

Heymes

Mitov

2017

J. High Energ. Phys.

139

156

View full text Add to dashboard Cite

show abstract

“…A framework for the simultaneous resummation of threshold and small-mass logarithms in differential cross sections in top-quark pair production at the LHC was set up in [30], and applied to the phenomenological study of tt invariant mass and top-quark transverse momentum distributions in [31]. The results are valid in the soft gluon emission limit, but contain an extra layer of resummation for small-mass logarithms, so that overlapping soft and small-mass logarithmic corrections are properly taken into account.…”

Section: Jhep05(2018)149mentioning

confidence: 99%

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

Czakon

Ferroglia

Heymes

et al. 2018

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

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 JHEP05 (2018)149 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 kinematicsdependent 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.

show abstract

“…The dependency on these theoretical models is reduced for the particle level measurement, for which the experimental uncertainties of jet energy calibration and b tagging efficiency are the most dominant. The results are compared to several SM predictions of approximate NNNLO [17,18] and NLO+NNLL [19] calculations as shown in the left plot of Fig. 3.…”

Section: Differential Cross Sectionsmentioning

confidence: 99%

Top Physics at CMS/LHC

Daskalakis

2017

EPJ Web Conf.

View full text Add to dashboard Cite

Abstract. Recent results on the inclusive and differential production cross sections of top-quark pair and single top-quark processes are presented, obtained using data from proton-proton collisions collected with the CMS detector at the LHC. The large centreof-mass energies available at LHC allow for the copious production of top-quark pairs in association with other final state particles at high transverse momentum. Measurements of such processes as well as of the top-quark mass and other properties will be discussed. The results are compared with the most up-to-date standard model theory predictions.

show abstract

Resummed Differential Cross Sections for Top-Quark Pairs at the LHC

Cited by 32 publications

References 31 publications

Dynamical scales for multi-TeV top-pair production at the LHC

Dynamical scales for multi-TeV top-pair production at the LHC

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

Top Physics at CMS/LHC

Contact Info

Product

Resources

About