NLO+NLL squark and gluino production cross sections with threshold-improved parton distributions

Beenakker, W.; Borschensky, Christoph; Krämer, M.; Kulesza, Anna; Laenen, Eric; Marzani, Simone; Rojo, Juan

doi:10.1140/epjc/s10052-016-3892-4

Cited by 60 publications

(78 citation statements)

References 144 publications

(207 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Prospino2 [93,101,105] and MadGolem [142][143][144] give predictions that are NLO-QCD accurate, while NLL-fast [145], NNLL-fast [146] and Resummino [147] also resum threshold logarithms. All codes, with the exception of MadGolem and Resummino, assume mass-degenerate squark spectra.…”

Section: Simulations and Cross Section Calculations In Susymentioning

confidence: 99%

Automated simulations beyond the Standard Model: supersymmetry

Frixione

Fuks

Hirschi

et al. 2019

J. High Energ. Phys.

View full text Add to dashboard Cite

The MadGraph5 aMC@NLO framework aims to automate all types of leading-and next-to-leading-order-accurate simulations for any user-defined model that stems from a renormalisable Lagrangian. In this paper, we present all of the key ingredients of such models in the context of supersymmetric theories. In order to do so, we extend the FeynRules package by giving it the possibility of dealing with different renormalisation options that are relevant to supersymmetric models. We also show how to deal with the problem posed by the presence of narrow resonances, thus generalising the so-called on-shell subtraction approaches. We extensively compare our total rate results with those of both Prospino2 and Resummino, and present illustrative applications relevant to the 13 TeV LHC, both at the total-rate and differential levels. The computer programs that we have used to obtain the predictions presented here are all publicly available. arXiv:1907.04898v1 [hep-ph] 10 Jul 2019 7 Conclusions 47 A Conventions for one-point and two-point functions 49 B The MoGRe package 50 B.1 The main method MoGRe$Renormalize and its options 50 B.2 Simplifying the procedure 51 B.3 Restrictions 52 B.4 Specifying the renormalisation scheme 52 B.5 Clearing a renormalisation scheme 52 B.6 Technical details on the functioning of the method 53 C Decoupling of heavy SUSY particles in MG5 aMC 55 -1 -which allows for the cancellation of chiral anomalies and to generate masses for all up-type and down-type particles.

show abstract

Section: Simulations and Cross Section Calculations In Susymentioning

confidence: 99%

Automated simulations beyond the Standard Model: supersymmetry

Frixione

Fuks

Hirschi

et al. 2019

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…Including these contributions in the PDFs can produce non-negligible differences in threshold resummed cross section predictions when compared to those obtained with regular PDFs. An example of this can be found in [76], which considered sparticle pair production. In particular, for a large range of sparticle masses considered it was found that while K-factors (defined as the ratio of the resummed result to the fixed order one) obtained with regular PDFs were almost always greater than unity, this was not always the case when resummed PDFs were employed.…”

Section: B Comparison With Resummed Pdfsmentioning

confidence: 99%

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

Czakon

Ferroglia

Heymes

et al. 2018

J. High Energ. Phys.

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

“…In this contribution, we explore the impact of the LHCb data on the NNPDF3.1 analysis and show how sizable constraints are derived at large-x for all the light quark PDFs and for the charm PDF. In turn, this leads to reduced theoretical uncertainties for the production of new massive BSM resonances, which are dominated currently by the large-x PDF uncertainties [11].…”

Section: Pos(dis2017)198mentioning

confidence: 99%

Improving quark flavor separation with forward W and Z production at LHCb

Rojo¹

2017

Proceedings of XXV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2017)

Self Cite

View full text Add to dashboard Cite

We quantify the constraints on the flavour separation between the quarks and antiquarks in the proton provided by the recent forward weak gauge boson production data from the LHCb experiment at √ s = 7 and 8 TeV. Performed in the framework of the NNPDF3.1 global analysis, this study highlights the key role that the LHCb W and Z data have in achieving a robust quark flavor separation in the large-x region, including the strange and charm quarks. We demonstrate how the LHCb measurements lead to improved determinations of the the up and down quark PDFs in the region x ∼ > 0.1, with an uncertainty reduction that can be as large as a factor 2. We also show how the LHCb forward measurements severely restrict the size of the fitted charm PDF at large x, imposing stringent constraints on non-perturbative models for the charm content of the nucleon.

show abstract

NLO+NLL squark and gluino production cross sections with threshold-improved parton distributions

Cited by 60 publications

References 144 publications

Automated simulations beyond the Standard Model: supersymmetry

Automated simulations beyond the Standard Model: supersymmetry

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

Improving quark flavor separation with forward W and Z production at LHCb

Contact Info

Product

Resources

About