MadGraph5_aMC@NLO automates tree-level, NLO, shower-matched, and merged cross-section computations for collider processes in a unified flexible framework.
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5 Pith papers cite this work. Polarity classification is still indexing.
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abstract
Based on the OPP technique and the HELAC framework, HELAC-1LOOP is a program that is capable of numerically evaluating QCD virtual corrections to scattering amplitudes. A detailed presentation of the algorithm is given, along with instructions to run the code and benchmark results. The program is part of the HELAC-NLO framework that allows for a complete evaluation of QCD NLO corrections.
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Computes the ratio of ttgamma/tt cross sections at LHC Run II with NLO QCD including off-shell effects, quantifying reduced theoretical uncertainties from correlations.
NLO QCD calculation of pp to ttH with decaying tops, including SMEFT operators O_tφ, O_φG, O_tG, O_tW in production and decays, with studies of linear/quadratic terms and RGE effects at 13.6 TeV.
Analytic expressions for one-loop helicity amplitudes in ttj and ttγ production are derived to O(ε²) as linear combinations of pentagon functions with rational coefficients in momentum-twistor variables, obtained via differential equations solved numerically by generalized power series expansion.
CMS reports fiducial and differential ttγ cross sections plus ttγ/tt ratios at 13 TeV that agree with Standard Model expectations within uncertainties.
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On the ratio of $t\bar{t}\gamma$ and $t\bar{t}$ cross sections at the LHC
Computes the ratio of ttgamma/tt cross sections at LHC Run II with NLO QCD including off-shell effects, quantifying reduced theoretical uncertainties from correlations.