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Exploring High-Purity Multiparton Scattering at Hadron Colliders (2024)
Journal Article
Andersen, J. R., Monni, P. F., Rottoli, L., Salam, G. P., & Soto-Ontoso, A. (2024). Exploring High-Purity Multiparton Scattering at Hadron Colliders. Physical Review Letters, 132(4), Article 041901. https://doi.org/10.1103/PhysRevLett.132.041901

Multiparton interactions are a fascinating phenomenon that occur in almost every high-energy hadron-hadron collision yet are remarkably difficult to study quantitatively. In this Letter, we present a strategy to optimally disentangle multiparton inte... Read More about Exploring High-Purity Multiparton Scattering at Hadron Colliders.

Efficient negative-weight elimination in large high-multiplicity Monte Carlo event samples (2023)
Journal Article
Andersen, J. R., Maier, A., & Maître, D. (2023). Efficient negative-weight elimination in large high-multiplicity Monte Carlo event samples. The European Physical Journal C, 83(9), Article 835. https://doi.org/10.1140/epjc/s10052-023-11905-0

We demonstrate that cell resampling can eliminate the bulk of negative event weights in large event samples of high multiplicity processes without discernible loss of accuracy in the predicted observables. The application of cell resampling to much l... Read More about Efficient negative-weight elimination in large high-multiplicity Monte Carlo event samples.

High energy resummed predictions for the production of a Higgs boson with at least one jet (2023)
Journal Article
Andersen, J. R., Hassan, H., Maier, A., Paltrinieri, J., Papaefstathiou, A., & Smillie, J. M. (2023). High energy resummed predictions for the production of a Higgs boson with at least one jet. Journal of High Energy Physics, 2023(3), Article 1 (2023). https://doi.org/10.1007/jhep03%282023%29001

We present all-order predictions for Higgs boson production plus at least one jet which are accurate to leading logarithm in s^/|p⊥|2. Our calculation includes full top and bottom quark mass dependence at all orders in the logarithmic part, and to hi... Read More about High energy resummed predictions for the production of a Higgs boson with at least one jet.

A standard convention for particle-level Monte Carlo event-variation weights (2023)
Journal Article
Bothmann, E., Buckley, A., Gütschow, C., Prestel, S., Schönherr, M., Skands, P., …Siódmok, A. (2023). A standard convention for particle-level Monte Carlo event-variation weights. SciPost Physics Core, 6, Article 007. https://doi.org/10.21468/scipostphyscore.6.1.007

Streams of event weights in particle-level Monte Carlo event generators are a convenient and immensely CPU-efficient approach to express systematic uncertainties in phenomenology calculations, providing systematic variations on the nominal prediction... Read More about A standard convention for particle-level Monte Carlo event-variation weights.

Unbiased elimination of negative weights in Monte Carlo samples (2022)
Journal Article
Andersen, J. R., & Maier, A. (2022). Unbiased elimination of negative weights in Monte Carlo samples. The European Physical Journal C, 82(5), Article 433. https://doi.org/10.1140/epjc/s10052-022-10372-3

We propose a novel method for the elimination of negative Monte Carlo event weights. The method is process-agnostic, independent of any analysis, and preserves all physical observables. We demonstrate the overall performance and systematic improvemen... Read More about Unbiased elimination of negative weights in Monte Carlo samples.

HEJ 2.1: High-energy resummation with vector bosons and next-to-leading logarithms (2022)
Journal Article
Andersen, J. R., Black, J., Brooks, H., Ducloué, B., Heil, M., Maier, A., & Smillie, J. M. (2022). HEJ 2.1: High-energy resummation with vector bosons and next-to-leading logarithms. Computer Physics Communications, 278, Article 108404. https://doi.org/10.1016/j.cpc.2022.108404

We present version 2.1 of the High Energy Jets (HEJ) event generator for hadron colliders. HEJ is a Monte Carlo generator for processes at high energies with multiple well-separated jets in the final state. To achieve accurate predictions, convention... Read More about HEJ 2.1: High-energy resummation with vector bosons and next-to-leading logarithms.

Combined subleading high-energy logarithms and NLO accuracy for W production in association with multiple jets (2021)
Journal Article
Andersen, J. R., Black, J. A., Brooks, H. M., Byrne, E. P., Maier, A., & Smillie, J. M. (2021). Combined subleading high-energy logarithms and NLO accuracy for W production in association with multiple jets. Journal of High Energy Physics, 2021(4), Article 105. https://doi.org/10.1007/jhep04%282021%29105

Large logarithmic corrections in s^/p2t lead to substantial variations in the perturbative predictions for inclusive W-plus-dijet processes at the Large Hadron Collider. This instability can be cured by summing the leading-logarithmic contributions i... Read More about Combined subleading high-energy logarithms and NLO accuracy for W production in association with multiple jets.

A Positive Resampler for Monte Carlo events with negative weights (2020)
Journal Article
Andersen, J. R., Gütschow, C., Maier, A., & Prestel, S. (2020). A Positive Resampler for Monte Carlo events with negative weights. The European Physical Journal C, 80(11), Article 1007. https://doi.org/10.1140/epjc/s10052-020-08548-w

We propose the Positive Resampler to solve the problem associated with event samples from state-of-the-art predictions for scattering processes at hadron colliders typically involving a sizeable number of events contributing with negative weight. The... Read More about A Positive Resampler for Monte Carlo events with negative weights.

HEJ 2: High energy resummation for hadron colliders (2019)
Journal Article
Andersen, J. R., Hapola, T., Heil, M., Maier, A., & Smillie, J. (2019). HEJ 2: High energy resummation for hadron colliders. Computer Physics Communications, 245, Article 106832. https://doi.org/10.1016/j.cpc.2019.06.022

We present HEJ 2, a new implementation of the High Energy Jets formalism for high-energy resummation in hadron-collider processes as a flexible Monte Carlo event generator. In combination with a conventional fixed-order event generator, HEJ 2 can be... Read More about HEJ 2: High energy resummation for hadron colliders.

Finite quark-mass effects in Higgs boson production with dijets at large energies (2019)
Journal Article
Andersen, J. R., Cockburn, J. D., Heil, M., Maier, A., & Smillie, J. M. (2019). Finite quark-mass effects in Higgs boson production with dijets at large energies. Journal of High Energy Physics, 2019(4), Article 127. https://doi.org/10.1007/jhep04%282019%29127

The production of a Higgs boson in association with at least two jets receives contributions both from the fusion of weak vector bosons (VBF) and from QCD processes, especially gluon fusion (GF). The former process is important for measuring the coup... Read More about Finite quark-mass effects in Higgs boson production with dijets at large energies.

Merging high energy with soft and collinear logarithms using HEJ and PYTHIA (2018)
Journal Article
Andersen, J. R., Brooks, H. M., & Lönnblad, L. (2018). Merging high energy with soft and collinear logarithms using HEJ and PYTHIA. Journal of High Energy Physics, 2018(9), Article 074. https://doi.org/10.1007/jhep09%282018%29074

We present a method to combine the all-order treatment of the High Energy Jets exclusive partonic Monte Carlo (HEJ) with the parton shower of Pythia8, while retaining the logarithmic accuracy of both. This procedure enables the generation of fully re... Read More about Merging high energy with soft and collinear logarithms using HEJ and PYTHIA.

Higgs-boson plus Dijets: Higher-Order Matching for High-Energy Predictions (2018)
Journal Article
Andersen, J. R., Hapola, T., Heil, M., Maier, A., & Smillie, J. M. (2018). Higgs-boson plus Dijets: Higher-Order Matching for High-Energy Predictions. Journal of High Energy Physics, 2018(08), Article 090. https://doi.org/10.1007/jhep08%282018%29090

Several important processes and analyses at the LHC are sensitive to higher-order perturbative corrections beyond what can currently be calculated at fixed order. The formalism of High Energy Jets (HEJ) calculates the corrections systematically enhan... Read More about Higgs-boson plus Dijets: Higher-Order Matching for High-Energy Predictions.

Higgs boson plus dijets: higher order corrections (2017)
Journal Article
Andersen, J. R., Hapola, T., Maier, A., & Smillie, J. M. (2017). Higgs boson plus dijets: higher order corrections. Journal of High Energy Physics, 2017(9), Article 065. https://doi.org/10.1007/jhep09%282017%29065

The gluon fusion component of Higgs-boson production in association with dijets is of particular interest because it both (a) allows for a study of the CP-structure of the Higgs-boson couplings to gluons, and (b) provides a background to the otherwis... Read More about Higgs boson plus dijets: higher order corrections.

Z/γ∗ plus multiple hard jets in high energy collisions (2016)
Journal Article
Andersen, J. R., Medley, J. J., & Smillie, J. M. (2016). Z/γ∗ plus multiple hard jets in high energy collisions. Journal of High Energy Physics, 2016(05), Article 136. https://doi.org/10.1007/jhep05%282016%29136

We present a description of the production of di-lepton pair production (through Z boson and virtual photon) in association with at least two jets. This calculation adds to the fixed-order accuracy the dominant logarithms in the limit of large parton... Read More about Z/γ∗ plus multiple hard jets in high energy collisions.

Dark Sector spectroscopy at the ILC (2014)
Journal Article
Andersen, J. R., Rauch, M., & Spannowsky, M. (2014). Dark Sector spectroscopy at the ILC. The European Physical Journal C, 74(6), Article 2908. https://doi.org/10.1140/epjc/s10052-014-2908-1

Recent studies have shown that searches in the mono-photon and missing energy final state can be used to discover dark matter candidates at the ILC. While an excess in this final state over the Standard Model background would indicate the existence o... Read More about Dark Sector spectroscopy at the ILC.

MultiJet Predictions for Higgs Studies (2013)
Journal Article
Andersen, J., & Smillie, J. (2013). MultiJet Predictions for Higgs Studies. Proceedings of Science, DIS 2013, Article 289

We discuss several issues which arise when describing the production of multiple hard jets (≥ 2) in LHC collisions and describe the solution offered through the High Energy Jets formalism. Throughout, there is particular emphasis on what we can and m... Read More about MultiJet Predictions for Higgs Studies.

Extracting precise Higgs couplings by using the matrix element method (2013)
Journal Article
Andersen, J., Englert, C., & Spannowsky, M. (2013). Extracting precise Higgs couplings by using the matrix element method. Physical Review D, 87(1), Article 015019. https://doi.org/10.1103/physrevd.87.015019

After the recent discovery of a Standard Model Higgs bosonlike particle at the LHC, the question of its couplings to known and unknown matter is eminent. In this paper, we present a method that allows for an enhancement in signal over background (irr... Read More about Extracting precise Higgs couplings by using the matrix element method.