https://doi.org/10.1140/epja/s10050-025-01707-1
Code Paper
Automated NLO calculations for asymmetric hadron-hadron collisions in MadGraph5_aMC@NLO
1
Dipartimento di Fisica, Università di Cagliari, Cittadella Universitaria, 09042, Monserrato, CA, Italy
2
INFN, Sezione di Cagliari, Cittadella Universitaria, 09042, Monserrato, CA, Italy
3
Faculty of Physics, Warsaw University of Technology, plac Politechniki 1, 00-661, Warszawa, Poland
4
Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342, Cracow, Poland
5
Université Paris-Saclay, CNRS, IJCLab, 91405, Orsay, France
6
Centre for Cosmology, Particle Physics and Phenomenology (CP3), Université Catholique de Louvain, Chemin du Cyclotron, B-1348, Louvain-la-Neuve, Belgium
a
Jean-Philippe.Lansberg@in2p3.fr
Received:
11
March
2025
Accepted:
29
September
2025
Published online:
24
October
2025
We have extended MadGraph5_aMC@NLO capabilities by implementing computations for asymmetric hadron-hadron collisions, including proton-nucleus, pion-hadron or nucleus-nucleus collisions in order to obtain a tool for automated perturbative computations of cross sections (or ratios of cross sections) in asymmetric reactions at next-to-leading (NLO) order in 
in collinear factorisation. This tool, like the original symmetric version of MadGraph5_aMC@NLO, automatically computes cross sections for different factorisation and renormalisation scales and PDFs provided by the LHAPDF library, thereby allowing for an easy assessment of the associated theoretical uncertainties. In this paper, we present the validation of our code using W and Z boson production in pPb collisions and Drell-Yan-pair production in 
collisions. We also illustrate the capabilities of the framework by providing cross section and nuclear modification factors with their uncertainties for the production of W and Z bosons, charm and bottom quarks as well as associated production of 
in pPb collisions at the LHC.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
