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LHCHXSWG Internal Note

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2026-06-04
17:01
Higgs Boson Pair Production via Gluon Fusion: Higher-Order Corrections and Theoretical Uncertainties / A H, Ajjath (Institute for Particle Physics Phenomenology, Durham University, Durham, United Kingdom and Centre for High Energy Physics, Indian Institute of Science, C. V. Raman Avenue, Bengaluru-560012, India) ; Alioli, Simone (Universita & INFN, Milano-Bicocca (IT)) ; Bagnaschi, Emanuele Angelo (INFN e Laboratori Nazionali di Frascati (IT)) ; Bhattacharya, Arunima (Theory Division, IFIC, University of Valencia-CSIC, Paterna, Valencia, Spain) ; Bi, Huan-Yu (School of Physics and Optoelectronic Engineering, Hainan University, Haikou, China) ; Bonciani, Roberto (Dipartimento di Fisica e Astronomia, Università di Firenze, Sesto Fiorentino, Italy) ; Bonetti, Marco (Institute for Theoretical Physics, University of Tübingen, Tübingen, Germany, and Institute for Astroparticle Physics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany and Institute for Theoretical Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany) ; Campanario, Francisco (Theory Division, IFIC, University of Valencia-CSIC, Paterna, Valencia, Spain) ; Carlotti, Sauro (Institute for Theoretical Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany) ; Chang, Jamie (PSI Center for Neutron and Muon Sciences, Villigen PSI, Switzerland and Institute for Theoretical Physics, ETH Zürich, Zürich, Switzerland) et al.
In this contribution, the higher-order QCD and electroweak corrections to Standard Model Higgs boson pair production via the gluon-fusion mechanism, $gg\to hh$, are summarized and the different sources of theoretical uncertainty are assessed. The discussion includes finite top quark mass effects, matching to parton showers, approximate NNLO and N$^3$LO QCD corrections, NLO electroweak effects, and uncertainties associated with the top quark mass scheme and perturbative scale choices. [...]
LHCHWG-INT-2026-001.- Geneva : CERN, 2026 - 67. Main Document: PDF;

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2025-05-13
11:41
Theoretical modelling of QCD radiation in off-shell Higgs production through gluon fusion / Coelho Lopes De Sa, Rafael (University of Massachusetts (US)) ; Rontsch, Raoul Horst (CERN) ; Javurkova, Martina (University of Massachusetts (US)) ; Lazzeretti, Matteo (University of Massachusetts (US))
The measurement of the Higgs boson width is a critical test of the Standard Model, with significant implications for understanding electroweak symmetry breaking. Direct measurements are limited by detector resolution, but it can be measured with greater precision through a combined analysis of on-shell and off-shell Higgs boson production. [...]
LHCHWG-INT-2025-003.- Geneva : CERN, 2025 - 18. Fulltext: PDF;

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2025-02-03
15:23
Test / Barone, Gaetano (Brown University (US)) ; Salvioni, Ennio (University of Sussex (GB))
LHCHWG-INT-2025-002.- Geneva : CERN, 2025

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2025-01-24
10:47
Simplified Template Cross Sections – Stage 1.1 and 1.2 / Berger, Nicolas (Centre National de la Recherche Scientifique (FR)) ; Heim, Sarah (Deutsches Elektronen-Synchrotron (DE)) ; Jovicevic, Jelena (University of Belgrade (RS)) ; Bonanomi, Matteo (Hamburg University (DE)) ; Tackmann, Frank (Deutsches Elektronen-Synchrotron (DE)) ; Bertella, Claudia (CERN, IHEP) ; Brahimi, Nihal (Centre National de la Recherche Scientifique (FR)) ; Calvet, Thomas (Stony Brook (US)) ; Calvetti, Milene (Universit`a and INFN Sezione di Pisa) ; Dao, Valerio (Stony Brook University (US)) et al.
Simplified Template Cross Sections (STXS) have been adopted by the LHC experiments as a common framework for Higgs measurements. Their purpose is to reduce the theoretical uncertainties that are directly folded into the measurements as much as possible, while at the same time allowing for the combination of the measurements between different decay channels as well as between experiments. [...]
LHCHWG-INT-2025-001.- Geneva : CERN, 2025 - 12. Fulltext: PDF;

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2024-12-03
13:23
Higgs production via vector-boson fusion at the LHC / Barone, Gaetano (Brown University (US)) ; Chen, Jiayi (Simon Fraser University (CA)) ; Ferrario Ravasio, Silvia (CERN) ; Pellen, Mathieu (University of Freiburg (DE))
In this article, we summarise the recent experimental measurements and theoretical work on Higgs-boson production via vector-boson fusion at the LHC. Along with this, we provide state-of-the-art predictions at fixed order as well as with parton-shower cor- rections within the Standard Model. [...]
LHCHWG-INT-2024-002.- Geneva : CERN, 2024 - MULT.P.

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2024-01-09
09:50
Benchmark Lines and Planes for Higgs-to-Higgs Decays in the NMSSM / Ellwanger, Ulrich Bernhard (Université Paris-Saclay (FR)) ; Muhlleitner, Margarete (Karlsruhe Institute of Technology) ; Rompotis, Nikolaos (University of Liverpool (GB)) ; Winterbottom, Daniel (Imperial College (GB)) ; Shah, Nausheen (Wayne State University)
A number of benchmark scenarios for NMSSM Higgs boson searches via Higgs-to- Higgs decays at the LHC have been proposed by the NMSSM Subgroup of the LHC HWG3. Some of them are already in use by the ATLAS and CMS collaborations for the interpretation of their results from Run 2. [...]
LHCHWG-INT-2024-001.- Geneva : CERN, 2024 addressing comments from circulation: PDF;

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2017-10-26
10:59
Constraining EFT parameters using simplified template cross sections / Hays, Chris (University of Oxford (GB)) ; Sanz Gonzalez, Veronica (CERN) ; Zemaityte, Gabija (University of Oxford (GB))
We discuss a procedure for fitting a set of dimension-6 effective field theory parameters using simplified template cross section measurements. The steps are to determine equations relating the parameters to the cross sections, choose the fit parameters and external constraints, and perform the fit. [...]
LHCHXSWG-INT-2017-001.- Geneva : CERN, 2017 - 20. Fulltext: PDF;

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2016-04-01
10:09
A morphing technique for signal modelling in a multidimensional space of coupling parameters / Brenner, Lydia (Nikhef National institute for subatomic physics (NL)) ; Belyaev, Nikita (National Research Nuclear University MEPhI (RU)) ; Bortolotto, Valerio (The Chinese University of Hong Kong (HK)) ; Burgard, Carsten Daniel (Albert-Ludwigs-Universitaet Freiburg (DE)) ; Duehrssen-Debling, Michael (CERN) ; Ecker, Katharina Maria (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (DE)) ; Gadatsch, Stefan (CERN) ; Gray, Dylan Shawn (New York University (US)) ; Kaluza, Adam (Johannes-Gutenberg-Universitaet Mainz (DE)) ; Koeneke, Karsten (Albert-Ludwigs-Universitaet Freiburg (DE)) et al.
This note describes a morphing method that produces signal models for fits to data in which both the event yields and kinematic distributions are simultaneously taken into account. The signal model is morphed in a continuous manner through the available multi-dimensional parameter space. [...]
LHCHXSWG-INT-2016-004.- Geneva : CERN, 2016 Fulltext: PDF;

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2016-03-09
16:32
New Physics in a Dimension-6 Lagrangian
LHCHXSWG-INT-2016-003.- Geneva : CERN, 2016

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2016-03-07
15:22
Higgs cross section at N3LO+N3LL / Bonvini, Marco (University of Oxford (GB)) ; Marzani, Simone (University at Buffalo)
We consider the inclusive production of a Higgs boson in gluon gluon fusion and we study the impact of threshold resummation at next-to-next-to-next-to-leading logarithmic accuracy (N3LL) on the recently computed fixed-order prediction at next-to-next-to-next-to-leading order (N3LO). In order to facilitate comparisons with other studies, we focus on the rescaled large-mt effective theory (rEFT). [...]
LHCHXSWG-INT-2016-002.- Geneva : CERN, 2016 - 16. Fulltext: PDF; External links: TROLL; ggHiggs

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