Fabio Maltoni
Centre for Cosmology, Particle Physics and Phenomenology - CP3
Université catholique de Louvain
2, Chemin du Cyclotron - Box L7.01.05
B-1348 Louvain-la-Neuve
+32 10 47 3166
My personal homepage
UCL member card
Teaching at UCL
Quantum Mechanics
First course on Quantum Mechanics.
45h+30h, 5 ECTS
Relativistic Quantum Mechanics
Introduction to the Dirac Equation.
15h+15h, 4 ECTS
Electroweak interactions
Introduction to the Standard Model of the electroweak interactions.
22.5h, 4 ECTS (shared with J.M.Gerard)
Strong interactions and symmetries
Introduction to perturbative QCD and symmetries
30h, 5 ECTS (shared with J.M.Gerard)
Seminars of theoretical and mathematical physics
Invited lectures on special topics.
15h, 2 ECTS.
People responsibilities
Mihailo Backovic (MOVE-IN), member since October 2014
dark matter pheno, collider phyiscs, BSM physics.

Michele Lucente, member since January 2016

Manoj Kumar Mandal, member since October 2016

Olivier Mattelaer (PAI), member since September 2005
Responsible software maintenance and development of MadGraph 5, AMLO (including MadSpin and ALOHA). Study of new experimental approaches using the matrix element re-weighting.

Ken Mimasu (PAI, MSCA), member since October 2016
Collider phenomenology beyond the Standard Model, particularly on extended scalar sectors (two-Higgs doublet models, axion-like particles). Probing the Electroweak phase transition at the LHC. Confronting Baryogenesis via a strong electroweak phase transition with collider signatures at the LHC and beyond. Precision Higgs measurements and global fits in the framework of effective field theory.

Liam Moore, member since December 2016
I work on Top Quark Phenomenology in the Standard Model Effective Field Theory, and the development of the FeynRules package.

Ambresh Shivaji (Move-In Louvain), member since September 2016
I work in the area of collider physics. My current research interests include precision calculations and phenomenology of new physics using effective field theories.

Antonio Santos,
BSM physics and dark matter.

PhD students
Benoît Hespel (FRIA), member since October 2012
Interested in fundamental interactions and extension of the Standard Model. More precisely I'm working on Higgs boson phenomenology at LHC (Higgs pair production through gluon fusion in the 2HDM).

Luca Mantani (MCnet3), member since September 2016
I work on LHC phenomenology, in particular how to detect new interactions among SM and intepret them via the SMEFT.

Antony Martini (ERC program (CERN)), member since September 2012
Interested in dark matter physics. I'm involved in the MadDM plugin to link indirect and direct detections to the DM production at the LHC. I also work on the monojet + MET topology involving gravitinos.

Ioannis Tsinikos (FNRS),
I am interested in collider phenomenology, focusing on Standard Model processes and beyond. At the current time I am working on EW corrections in ttbar production at the LHC.

Xiaoran Zhao, member since April 2017
Higgs phenomonology.

Master students
Riccardo Costa, member since September 2016

Research statement
The high energy and luminosity of the present and future colliders, from the Tevatron (FNAL) to the Large Hadron Collider (CERN) to a Tev Linear Collider, will offer the widest range of physics opportunities to the exploration of the high-energy frontier. Among the highest priorities is understanding not only the nature of the electroweak symmetry breaking (EWSB) but also the mechanism through which the electroweak scale stabilizes. Simple and very robust arguments indicate that this scale should be less than one TeV, very much in the reach of the above mentioned colliders. At this energy, spectacular events take place and mulijet final states in association with leptons or missing energy constitutes the most interesting data samples. The quest for the Higgs boson(s) and/or for supersymmetric particles will rely on our ability of predicting both the signal and the standard model processes which are the backgrounds of these searches.

The difficulty of detecting such signatures asks for a dedicated and joint effort of all the high-energy physics community. Not only the best theoretical predictions for the expected signals will be necessary, but also a very good understanding of the large QCD backgrounds and the detectors responses will allow us to unreveal the mechanism of EWSB. In this respect, I consider of primary importance for theorists to work in close contact with experimentalists.

In the next crucial years which will see the first new data from the LHC, I plan to focus my efforts in two main directions:

  1. provide new and/or more precise evaluations of the most important signatures that probe the the EWSB mechanism, such as top and Higgs boson(s) production both in the standard model and its extensions.
  2. provide the experimentalists at the colliders with the means to simulate events occurring at the energy frontier.
I am involved in the following research directions:

Advanced Multi-Variate Analysis for New Physics Searches at the LHC

With the 2012 discovery of the Higgs boson at the Large Hadron Collider, LHC, the Standard Model of particle physics has been completed, emerging as a most successful description of matter at the smallest distance scales. But as is always the case, the observation of this particle has also heralded the dawn of a new era in the field: particle physics is now turning to the mysteries posed by the presence of dark matter in the universe, as well as the very existence of the Higgs. The upcoming run of the LHC at 13 TeV will probe possible answers to both issues, providing detailed measurements of the properties of the Higgs and extending significantly the sensitivity to new phenomena.

Since the LHC is the only accelerator currently exploring the energy frontier, it is imperative that the analyses of the collected data use the most powerful possible techniques. In recent years several analyses have utilized multi-variate analysis techniques, obtaining higher sensitivity; yet there is ample room for further improvement. With our program we will import and specialize the most powerful advanced statistical learning techniques to data analyses at the LHC, with the objective of maximizing the chance of new physics discoveries.

We are part of a network of European institutions whose goal is to foster the development and exploitation of Advanced Multi-Variate Analysis (AMVA) for New Physics searches. The network offers extensive training in both physics and advanced analysis techniques to graduate students, focusing on providing them with the know-how and the experience to boost their career prospects in and outside academia. The network develops ties with non-academic partners for the creation of interdisciplinary software tools, allowing a successful knowledge transfer in both directions. The network studies innovative techniques and identifies their suitability to problems encountered in searches for new physics at the LHC and detailed studies of the Higgs boson sector.

External collaborators: University of Oxford, INFN, University of Padova, Université Blaise Pascal, LIP, IASA, CERN, UCI, EPFL, B12 Consulting, SDG Consulting, Yandex, MathWorks.

Complementarity of dark matter searches in simplified models

Study of the complementarity between dark matter relic abundance, direct detection, indirect detection and collider searches applied to the dark matter simplified models. These models consider a dark matter candidate communicating to the quark (especially top) sector of the standard model via a bosonic or vectorial mediator.

External collaborators: Eric Conte (GPRHE), Benjamin Fuks (LPTHE), Jun Guo (Chinese Academy of Science), Jan Heisig (RWTH), Kentarou Mawatari (LPSC Grenoble), Michael Kraemer (RWTH), Mathieu Pellen (University of Wuerzburg).


Implementation of the SMEFT at NLO in QCD in the Feynrules MadGraph5_aMLO chain and phenomenological studies

External collaborators: Cen Zhang, Celine Degrande.

Electroweak corrections

Automation of the calculation of NLO Electroweak corrections and phenomenological studies of their impact on Standard-Model and Beyond-the-Standard-Model processes at colliders.


An automated framework for BSM phenomenology that allows one to compute Feynman rules from a Lagrangian.

External collaborators: Céline Degrande (CERN) Benjamin Fuks (Jussieu).

Higgs phenomenology at the LHC

We study the Vector Boson Fusion production channel for the Higgs boson and other particles at the LHC, mainly focusing on the role of QCD corrections.

Loop-induced processes in the SM and Beyond

Automation within MadGraph5_aMLO and phenomenological studies of loop-induced processes for the LHC


Monte Carlo development.

External collaborators: Benjamin Fuks, Kentarou Mawatari, Kaoru Hagiwara, Tim Stelzer, Stefano Frixione, Marco Zaro, Rikkert Frederix, Valentin Hirschi, Paolo Torrielli, Johan Alwall, Hua-Sheng Shao, Mihailo Backovic,...

Search for nonresonant Higgs boson pair production in the llbb+MET final state

The discovery of a Higgs boson (H) by the ATLAS and CMS experiments fixes the value of the self-coupling λ in the scalar potential whose form is determined by the symmetries of the Standard Model and the requirement of renormalisability. Higgs boson pair production is sensitive to the self-coupling and will play a major role in investigating the scalar potential structure.

This project consists in a search for nonresonant Higgs boson pair production via gluon fusion in the final state with two leptons, two b jets and missing transvere energy – gg → H(bb) H(WW) asking for the leptonic decay of the W's. The analysis is conducted in close collaboration with phenomenologists to ensure the approach is theoretically sound and future-proof.

Study of processes with heavy quarks in the initial state

The difference between predictions obtained with a massive scheme, where a heavy quark is treated as a finale massive state and the massless scheme, where the heavy quark is viewed as an initial parton may be extremely sizable. The aim of the project is to gain a better understanding of the size of the collinear logarithms arising when a heavy quark is treated as a final massive state and to investigate its kinematical origin.

External collaborators: Maria Ubiali, Giovanni Ridolfi.

Show past projects.
Publications in CP3
Showing 5 publications over 98. Show all publications.
All my publications on Inspire


Gluon-fusion Higgs production in the Standard Model Effective Field Theory
Nicolas Deutschmann, Claude Duhr, Fabio Maltoni, Eleni Vryonidou
Submitted to JHEP.
Refereed paper. 31st July.


tWH associated production at the LHC
Federico Demartin, Benedikt Maier, Fabio Maltoni, Kentarou Mawatari, Marzo Zaro
to be submitted to JHEP
Refereed paper. 19th July.
Higgs production in association with a top-antitop pair in the Standard Model Effective Field Theory at NLO in QCD
Fabio Maltoni, Eleni Vryonidou, Cen Zhang
to be submitted to JHEP
Refereed paper. 18th July.
Probing the Higgs self coupling via single Higgs production at the LHC
G. Degrassi, P.P. Giardino, F. Maltoni, D. Pagani
[Abstract] [PDF] [Journal] refereed paper
Refereed paper. 14th July.
Signal background interference effects in heavy scalar production and decay to a top-anti-top pair
B. Hespel, F. Maltoni, E. Vryonidou
to be submitted to JHEP
Refereed paper. 13th June.

[UCLouvain] - [SST] [IRMP] - [SC]
Contact : Jérôme de Favereau