The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations

Alwall, Johan; Frederix, Rikkert; Frixione, Stefano; Hirschi, Valentin; Maltoni, Fabio; Mattelaer, Olivier; Shao, Hua-Sheng; Stelzer, T.; Torrielli, Paolo; Zaro, Marco

doi:10.1007/jhep07(2014)079

Cited by 6,069 publications

(5,840 citation statements)

References 337 publications

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“…[41] that modify tt production. For each of the proposed beyond standard model (BSM) benchmarks, we produce a tt MC sample using the madgraph [42] generator interfaced to pythia 6.4 for showering and hadronization, and the cteq6l1 PDFs. The Z ′ boson model proposed in Ref.…”

Section: B Beyond Standard Model Benchmarksmentioning

confidence: 99%

Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states fromtt¯production at the Tevatron

Abazov¹,

Abbott²,

Acharya³

et al. 2015

Phys. Rev. D

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We present a simultaneous measurement of the forward-backward asymmetry and the top-quark polarization in tt production in dilepton final states using 9.7 fb −1 of proton-antiproton collisions at √ s = 1.96 TeV with the D0 detector. To reconstruct the distributions of kinematic observables we employ a matrix element technique that calculates the likelihood of the possible tt kinematic configurations. After accounting for the presence of background events and for calibration effects, we obtain a forward-backward asymmetry of A tt = (15.0 ± 6.4 (stat) ± 4.9 (syst))% and a top-quark polarization times spin analyzing power in the beam basis of κP = (7.2 ± 10.5 (stat) ± 4.2 (syst))%, with a correlation of −56% between the measurements. If we constrain the forward-backward asymmetry to its expected standard model value, we obtain a measurement of the top polarization of κP = (11.3±9.1 (stat)±1.9 (syst))%. If we constrain the top polarization to its expected standard model value, we measure a forward-backward asymmetry of A tt = (17.5 ± 5.6 (stat) ± 3.1 (syst))%. A combination with the D0 A tt measurement in the lepton+jets final state yields an asymmetry of A tt = (11.8 ± 2.5 (stat) ± 1.3 (syst))%. Within their respective uncertainties, all these results are consistent with the standard model expectations.

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Section: B Beyond Standard Model Benchmarksmentioning

confidence: 99%

Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states fromtt¯production at the Tevatron

Abazov¹,

Abbott²,

Acharya³

et al. 2015

Phys. Rev. D

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show abstract

“…We generate the signal and background events at the parton level using MadGraph 5 [64,65] with CTEQ6L1 parton distribution functions (PDF) [66]. For signal events, we generate pp → ϕ + nj to n=1.…”

Section: Hh Channelmentioning

confidence: 99%

Higgs-flavon mixing and LHC phenomenology in a simplified model of broken flavor symmetry

et al. 2014

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The LHC phenomenology of a low-scale gauged flavor symmetry model with inverted hierarchy is studied, through introduction of a simplified model of broken flavor symmetry. A new scalar (a flavon) and a new neutral top-philic massive gauge boson emerge with mass in the TeV range along with a new heavy fermion associated with the standard model top quark. After checking constraints from electroweak precision observables, we investigate the influence of the model on Higgs boson physics, notably on its production cross section and decay branching fractions. Limits on the flavon ϕ from heavy Higgs boson searches at the LHC at 7 and 8 TeV are presented. The branching fractions of the flavon are computed as a function of the flavon mass and the Higgs-flavon mixing angle. We also explore possible discovery of the flavon at 14 TeV, particularly via the ϕ → Z 0 Z 0 decay channel in the 2 2 final state, and through standard model Higgs boson pair production ϕ → hh in the bbγγ final state. We conclude that the flavon mass range up to 500 GeV could probed down to quite small values of the Higgs-flavon mixing angle with 100 fb −1 of integrated luminosity at 14 TeV.

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“…The MC simulation of signal and background processes is used to optimize the selection criteria, estimate uncertainties, and study the shapes of the signal and background diphoton invariant mass (m γγ ) distributions. Signal events from Z 0 B , Z 0 -2HDM, and the heavy-scalar models are generated using MADGRAPH_AMC@NLO 2.2.3 [20] at LO in quantum chromodynamics (QCD) using the NNPDF3.0LO [21] parton distribution function (PDF) set. Parton showering and hadronization are handled by the PYTHIA 8.186 [22] event generator with the A14 [23] set of tuned parameters (tune), using the NNPDF2.3LO PDF set [24].…”

Section: Data and Simulation Samplesmentioning

confidence: 99%

Search for dark matter in association with a Higgs boson decaying to two photons at s=13 TeV with the ATLAS detector

Aaboud¹,

Aad²,

Abbott³

et al. 2017

Phys. Rev. D

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A search for dark matter in association with a Higgs boson decaying to two photons is presented. This study is based on data collected with the ATLAS detector, corresponding to an integrated luminosity of 36.1 fb −1 of proton-proton collisions at the LHC at a center-of-mass energy of 13 TeV in 2015 and 2016. No significant excess over the expected background is observed. Upper limits at 95% confidence level are set on the visible cross section for beyond the Standard Model physics processes, and the production cross section times branching fraction of the Standard Model Higgs boson decaying into two photons in association with missing transverse momentum in three different benchmark models. Limits at 95% confidence level are also set on the observed signal in two-dimensional mass planes. Additionally, the results are interpreted in terms of 90% confidence-level limits on the dark-matternucleon scattering cross section, as a function of the dark-matter particle mass, for a spin-independent scenario.

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The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations

Cited by 6,069 publications

References 337 publications

Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states fromtt¯production at the Tevatron

Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states fromtt¯production at the Tevatron

Higgs-flavon mixing and LHC phenomenology in a simplified model of broken flavor symmetry

Search for dark matter in association with a Higgs boson decaying to two photons at s=13 TeV with the ATLAS detector

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