$${t {{\bar{t}}}H}$$ production at NNLO: the flavour off-diagonal channels

Catani, Stefano; Fabre, I.; Grazzini, Massimiliano; Kallweit, Stefan

doi:10.1140/epjc/s10052-021-09247-w

Cited by 22 publications

(15 citation statements)

References 78 publications

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“…The extension to associated heavy-quark pair production does not introduce any new QCD structures, but is complicated by the evaluation of the required soft function for the given kinematics. As a proof of concept, the NNLO contributions in the non-diagonal partonic channels for t tH production were calculated in this approach within the MATRIX framework [548]. The evaluation of the soft function for this process will pave the way for treating the production of heavy-quark pairs in association with arbitrary colorless particles, given that two-loop amplitudes for the respective processes or at least suitable approximations can be obtained.…”

Section: Matrixmentioning

confidence: 99%

Event Generators for High-Energy Physics Experiments

Campbell¹,

Diefenthaler²,

Hobbs³

et al. 2022

Preprint

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Section: Matrixmentioning

confidence: 99%

Event Generators for High-Energy Physics Experiments

Campbell¹,

Diefenthaler²,

Hobbs³

et al. 2022

Preprint

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“…Associated production of Higgs bosons and top-quark pairs. Recently a part of the NNLO calculation for t tH production came out [62], while no public code has been released yet. Instead, we make predictions using…”

Section: Appendix A: Computation Of Hadronic Cross Sectionsmentioning

confidence: 99%

Parton distributions need representative sampling

Courtoy¹,

Houston²,

Nadolsky³

et al. 2022

Preprint

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In global QCD fits of parton distribution functions (PDFs), a large part of the estimated uncertainty on the PDFs originates from the choices of parametric functional forms and fitting methodology. We argue that these types of uncertainties can be underestimated with common PDF ensembles in high-stake measurements at the Large Hadron Collider and Tevatron. A fruitful approach to quantify these uncertainties is to view them as arising from sampling of allowed PDF solutions in a multidimensional parametric space. This approach applies powerful insights gained in recent statistical studies of large-scale population surveys and quasi-Monte Carlo integration methods. In particular, PDF fits may be affected by the big data paradox, which stipulates that more experimental data do not automatically raise the accuracy of PDFs -close attention to the data quality and sampling of possible PDF solutions is as essential. To test if the sampling of the PDF uncertainty of an experimental observable is truly representative of all acceptable solutions, we introduce a technique ("a hopscotch scan") based on a combination of parameter scans and stochastic sampling. With this technique, we show that the PDF uncertainty on key LHC cross sections at 13 TeV obtained with the public NNPDF4.0 fitting code is larger than the nominal uncertainty obtained with the published NNPDF4.0 Monte-Carlo replica sets. In the PDF ensembles obtained in the analytic minimization (Hessian) formalism, the tolerance on the PDF uncertainty must be based on sufficiently complete sampling of PDF functional forms and choices of the experiments.

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“…However, such a calculation is still out-of-reach due to the obvious obstacles from the complicated two-loop amplitudes. A part of the NNLO contributions that do not involve two-loop amplitudes is recently available [19].…”

Section: Introductionmentioning

confidence: 99%

Two-loop infrared singularities in the production of a Higgs boson associated with a top-quark pair

Chen,

Ma,

Wang

et al. 2022

Preprint

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The associated production of a Higgs boson and a top-quark pair is important for probing the Yukawa coupling of the top quark, and calls for better theoretical modeling. In this paper, we calculate the two-loop infrared divergences in t tH production at hadron colliders. To do that we compute the one-loop amplitudes to higher orders in the dimensional regulator . Numeric results for the infrared poles are given as a reference at several representative phase-space points. The result in this work servers as a part of the ongoing efforts towards the t tH cross sections at the next-to-next-to-leading order.

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$${t {{\bar{t}}}H}$$ production at NNLO: the flavour off-diagonal channels

Abstract: We consider QCD radiative corrections to the associated production of a heavy-quark pair ($$Q{{\bar{Q}}}$$ Q Q ¯ ) with a generic colourless system F at hadron colliders. We discuss the resummation formalism for the production of the $$Q{{\bar{Q}}}F$$ … Show more

Cited by 22 publications

References 78 publications

Event Generators for High-Energy Physics Experiments

Event Generators for High-Energy Physics Experiments

Parton distributions need representative sampling

Two-loop infrared singularities in the production of a Higgs boson associated with a top-quark pair

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