Antenna subtraction at NNLO with hadronic initial states: double real initial-initial configurations

Gehrmann, Thomas; Monni, Pier Francesco

doi:10.1007/jhep10(2012)047

Cited by 112 publications

(94 citation statements)

References 154 publications

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“…[21,22], where the NNLO QCD corrections to Z + jet production were computed using the antenna subtraction formalism [36][37][38][39][40][41][42][43][44] to isolate the infrared singularities in the different Z-boson-plus-jet contributions. Our calculation is implemented in a newly developed parton-level Monte Carlo generator NNLOjet.…”

Section: Numerical Resultsmentioning

confidence: 99%

NNLO QCD corrections for Drell-Yan p ZT and $$ {\phi}_{{}^{\eta}}^{\ast } $$ observables at the LHC

Ridder

Gehrmann

Glover

et al. 2016

J. High Energ. Phys.

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Drell-Yan lepton pairs with finite transverse momentum are produced when the vector boson recoils against (multiple) parton emission(s), and is determined by QCD dynamics. At small transverse momentum, the fixed order predictions break down due to the emergence of large logarithmic contributions. This region can be studied via the p Z T distribution constructed from the energies of the leptons, or through the φ * η distribution that relies on the directions of the leptons. For sufficiently small transverse momentum, the φ * η observable can be measured experimentally with better resolution. We study the small p Z T and φ * η distributions up to next-to-next-to-leading order (NNLO) in perturbative QCD. We compute the φ * η distributions for the fully inclusive production of lepton pairs via Z/γ * to NNLO and normalise them to the NNLO cross sections for inclusive Z/γ * production. We compare our predictions with the φ * η distribution measured by the ATLAS collaboration during LHC operation at 8 TeV. We find that at moderate to large values of φ * η , the NNLO effects are positive and lead to a substantial improvement in the theory-data comparison compared to next-to-leading order (NLO). At small values of p Z T and φ * η , the known large logarithmic enhancements emerge through and we identify the region where resummation is needed. We find an approximate relationship between the values of p Z T and φ * η where the large logarithms emerge and find perturbative consistency between the two observables.

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Section: Numerical Resultsmentioning

confidence: 99%

NNLO QCD corrections for Drell-Yan p ZT and $$ {\phi}_{{}^{\eta}}^{\ast } $$ observables at the LHC

Ridder

Gehrmann

Glover

et al. 2016

J. High Energ. Phys.

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“…The NNLO QCD predictions for Z +jet production have been obtained with the parton-level event generator NNLOjet, which provides the necessary infrastructure to perform fully differential calculations at NNLO using the antenna subtraction formalism [53][54][55][56][57][58][59][60][61]. The computation of pp → W +jet through NNLO is based on the N -jettiness subtraction scheme for NNLO calculations [13].…”

Section: Computational Frameworkmentioning

confidence: 99%

“…. , (60) which comprises QCD scale and shape variations, as well as process-correlation and PDF uncertainties. To this end we extend Eq.…”

Section: Pdf Uncertaintiesmentioning

confidence: 99%

Precise predictions for $$V+$$ V + jets dark matter backgrounds

et al. 2017

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High-energy jets recoiling against missing transverse energy (MET) are powerful probes of dark matter at the LHC. Searches based on large MET signatures require a precise control of the Z (νν)+ jet background in the signal region. This can be achieved by taking accurate data in control regions dominated by Z ( + − )+ jet, W ( ν)+ jet and γ + jet production, and extrapolating to the Z (νν)+ jet background by means of precise theoretical predictions. In this context, recent advances in perturbative calculations open the door to significant sensitivity improvements in dark matter searches. In this spirit, we present a combination of state-of-the-art calculations for all relevant V + jets processes, including throughout NNLO QCD corrections and NLO electroweak corrections supplemented by Sudakov logarithms at two loops. Predictions at parton level are provided together with detailed recommendations for their usage in experimental analyses based on the reweighting of Monte Carlo samples. Particular attention is devoted to the estimate of theoretical uncertainties in the framework of dark matter searches, where subtle aspects such as correlations across different V + jet processes play a key role. The anticipated theoretical uncertainty in the Z (νν)+ jet background is at the few percent level up to the TeV range.G. P. Salam: On leave from CNRS, UMR 7589, LPTHE, F-75005,

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“…In this calculation we employ the antenna subtraction method [55][56][57][58][59][60][61][62][63] to isolate the infrared singularities in the different contributions to enable their cancellation prior to the numerical implementation. The construction of the calculation and the subtraction terms is exactly as described in ref.…”

Section: Setupmentioning

confidence: 99%

The NNLO QCD corrections to Z boson production at large transverse momentum

Ridder

Gehrmann

Glover

et al. 2016

J. High Energ. Phys.

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Abstract:The transverse momentum distribution of massive neutral vector bosons can be measured to high accuracy at hadron colliders. The transverse momentum is caused by a partonic recoil, and is determined by QCD dynamics. We compute the single and double-differential transverse momentum distributions for fully inclusive Z/γ * production including leptonic decay to next-to-next-to-leading order (NNLO) in perturbative QCD. We also compute the same distributions normalised to the cross sections for inclusive Z/γ * production, i.e. integrated over the transverse momentum of the lepton pair. We compare our predictions for the fiducial cross sections to the 8 TeV data set from the ATLAS and CMS collaborations, which both observed a tension between data and NLO theory predictions, using the experimental cuts and binning. We find that the inclusion of the NNLO QCD effects does not fully resolve the tension with the data for the unnormalised p Z T distribution. However, we observe that normalising the NNLO Z-boson transverse momentum distribution by the NNLO Drell-Yan cross section substantially improves the agreement between experimental data and theory, and opens the way for precision QCD studies of this observable.

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Antenna subtraction at NNLO with hadronic initial states: double real initial-initial configurations

Cited by 112 publications

References 154 publications

NNLO QCD corrections for Drell-Yan p ZT and $$ {\phi}_{{}^{\eta}}^{\ast } $$ observables at the LHC

NNLO QCD corrections for Drell-Yan p ZT and $$ {\phi}_{{}^{\eta}}^{\ast } $$ observables at the LHC

Precise predictions for $$V+$$ V + jets dark matter backgrounds

The NNLO QCD corrections to Z boson production at large transverse momentum

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