aMCfast: automation of fast NLO computations for PDF fits

Abstract

We present the interface between MadGraph5_aMC@NLO, a self-contained program that calculates cross sections up to next-to-leading order accuracy in an automated manner, and APPLgrid, a code that parametrises such cross sections in the form of look-up tables which can be used for the fast computations needed in the context of PDF fits. The main characteristic of this interface, which we dub aMCfast, is its being fully automated as well, which removes the need to extract manually the process-specific information for additional physics processes, as is the case with other matrix element calculators, and renders it straightforward to include any new process in the PDF fits. We demonstrate this by studying several cases which are easily measured at the LHC, have a good constraining power on PDFs, and some of which were previously unavailable in the form of a fast interface.

arXiv comment36 pages, 10 figures

References in corpus (83)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• FastJet user manual
• Parton distributions for the LHC
• Parton distributions with LHC data
• Matching NLO QCD computations and parton shower simulations
• The total top quark pair production cross-section at hadron colliders through O(alpha_S^4)
• Scattering Amplitudes with Open Loops
• Three-jet cross sections to next-to-leading order
• Reducing full one-loop amplitudes to scalar integrals at the integrand level
• Rivet user manual
• Parton distributions with QED corrections
• The CT10 NNLO Global Analysis of QCD
• CutTools: a program implementing the OPP reduction method to compute one-loop amplitudes
• Electroweak corrections to charged-current e+e- --> 4 fermion processes - technical details and further results
• Automation of one-loop QCD corrections
• A first unbiased global NLO determination of parton distributions and their uncertainties
• Isolated photons in perturbative QCD
• APFEL: A PDF Evolution Library with QED corrections
• Automation of next-to-leading order computations in QCD: the FKS subtraction
• Impact of Heavy Quark Masses on Parton Distributions and LHC Phenomenology
• Next-to-leading order corrections to W+2 jet and Z+2 jet production at hadron colliders
• A general approach to jet cross sections in QCD
• QCDNUM: Fast QCD Evolution and Convolution
• A Higher Order Perturbative Parton Evolution Toolkit (HOPPET)
• Three-jet cross sections in hadron-hadron collisions at next-to-leading order
• Parton Distributions for LHC
• A posteriori inclusion of parton density functions in NLO QCD final-state calculations at hadron colliders: The APPLGRID Project
• Measurement of the inclusive W+- and Z/gamma cross sections in the electron and muon decay channels in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• The ABM parton distributions tuned to LHC data
• Precise Measurement of Dimuon Production Cross-Sections in muon neutrino Fe and muon antineutrino Fe Deep Inelastic Scattering at the Tevatron
• Measurement of the top quark-pair production cross section with ATLAS in pp collisions at $\sqrt{s}=7\TeV$
• Measurement of inclusive jet and dijet production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
• Measurement of the Inclusive Upsilon production cross section in pp collisions at sqrt(s)=7 TeV
• Large N and double scaling limits in two dimensions
• Measurement of the Rapidity and Transverse Momentum Distributions of Z Bosons in pp Collisions at sqrt(s)=7 TeV
• Measurement of differential top-quark pair production cross sections in pp collisions at sqrt(s) = 7 TeV
• Four-lepton production at hadron colliders: aMC@NLO predictions with theoretical uncertainties
• Measurement of the shape of the boson rapidity distribution for p\bar{p}-> Z/gamma*-> e+e- +X events produced at sqrt(s) of 1.96 TeV
• Quantitative constraints on the gluon distribution function in the proton from collider isolated-photon data
• Progress in the Determination of the Partonic Structure of the Proton
• Measurement of the muon charge asymmetry in inclusive pp to WX production at sqrt(s) = 7 TeV and an improved determination of light parton distribution functions
• Parton Distribution Benchmarking with LHC Data
• Measurement of the production cross section of jets in association with a Z boson in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering
• Measurement of the differential and double-differential Drell-Yan cross sections in proton-proton collisions at sqrt(s) = 7 TeV
• Measurement of the production of a W boson in association with a charm quark in pp collisions at sqrt(s)=7 TeV with the ATLAS detector
• Infrared Safe but Infinite: Soft-Gluon Divergences Inside the Physical Region
• Constraints on the gluon PDF from top quark pair production at hadron colliders
• Measurement of the inclusive isolated prompt photon cross-section in pp collisions at sqrt(s)= 7 TeV using 35 pb-1 of ATLAS data
• Measurement of the inclusive jet cross section in pp collisions at sqrt(s)=2.76 TeV and comparison to the inclusive jet cross section at sqrt(s)=7 TeV using the ATLAS detector
• Measurement of associated W + charm production in pp collisions at sqrt(s) = 7 TeV
• fastNLO: Fast pQCD Calculations for PDF Fits
• Measurement of the Differential Cross Section for Isolated Prompt Photon Production in pp Collisions at 7 TeV
• Measurements of top quark pair relative differential cross-sections with ATLAS in pp collisions at sqrt(s) = 7 TeV
• Measurement of dijet cross sections in pp collisions at 7 TeV centre-of-mass energy using the ATLAS detector
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector using 4.6 fb-1
• Measurement of the Isolated Prompt Photon Production Cross Section in pp Collisions at sqrt(s) = 7 TeV
• W and Z/gamma* boson production in association with a bottom-antibottom pair
• Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) = 7 TeV
• Cross Section Ratios between different CM energies at the LHC: opportunities for precision measurements and BSM sensitivity
• Determination of Strange Sea Quark Distributions from Fixed-target and Collider Data
• Measurement of the production cross sections for a Z boson and one or more b jets in pp collisions at sqrt(s) = 7 TeV
• Measurement of the top quark pair cross section with ATLAS in pp collisions at sqrt(s) = 7 TeV using final states with an electron or a muon and a hadronically decaying tau lepton
• Measurement of the inclusive jet cross section in pp collisions at sqrt(s) = 2.76 TeV
• Measurement of the triple-differential cross section for photon + jets production in proton-proton collisions at sqrt(s) = 7 TeV
• Structure Functions
• Theory-Data Comparisons for Jet Measurements in Hadron-Induced Processes
• Measurement of $d\sigma /dy$ of Drell-Yan $e^{+}{e}^{-}$ pairs in the $Z$ Mass Region from $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV
• Measurement of the production cross section for Z/gamma* in association with jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• The impact of PDF uncertainties on the measurement of the W boson mass at the Tevatron and the LHC
• The Charm Content of W+1 Jet Events as a Probe of the Strange Quark Distribution Function
• Charm production in association with an electroweak gauge boson at the LHC
• The Quark and Gluon Structure of the Proton
• Sensitivity of the LHC isolated-gamma+jet data to the parton distribution functions of the proton
• MCgrid: projecting cross section calculations on grids
• Ratios of $W$ and $Z$ cross sections at large boson $p_T$ as a constraint on PDFs and background to new physics
• Measurements of differential jet cross sections in proton-proton collisions at sqrt(s) = 7 TeV with the CMS detector
• Rapidity distributions in exclusive Z + jet and photon + jet events in pp collisions at sqrt(s) = 7 TeV
• The Effect of LHC Jet Data on MSTW PDFs
• On the Relation of the LHeC and the LHC
• Parton distributions at the dawn of the LHC
• LHAPDF: PDF Use from the Tevatron to the LHC

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• A compression algorithm for the combination of PDF sets
• Summary of the Topical Workshop on Top Quark Differential Distributions 2014
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