Contact
Fabio Maltoni
Position
Academic staff
Address
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
Belgium
Université catholique de Louvain
2, Chemin du Cyclotron - Box L7.01.05
B-1348 Louvain-la-Neuve
Belgium
Phone
+32 10 47 3166
Office
Personal homepage
UCL member card
Teaching at UCL
Quantum Mechanics
Relativistic Quantum Mechanics
Electroweak interactions
Strong interactions and symmetries
Seminars of theoretical and mathematical physics
Relativistic Quantum Mechanics
Electroweak interactions
PHY2224
Introduction to the Standard Model of the electroweak interactions.
22.5h, 4 ECTS (shared with J.M.Gerard)
Introduction to the Standard Model of the electroweak interactions.
22.5h, 4 ECTS (shared with J.M.Gerard)
Strong interactions and symmetries
Seminars of theoretical and mathematical physics
PHY2501
Invited lectures on special topics.
15h, 2 ECTS.
Invited lectures on special topics.
15h, 2 ECTS.
People responsibilities
Postdocs
PhD students
Master students
Visitors
Interns
Former members
Yang Ma
My main research interest lies in elementary particle physics theory, focusing on high-energy collider physics as well as connections to astro-particle physics and cosmology. While the Standard Model (SM) of particle physics provides a remarkably successful description of elementary matter and forces, it fails to address a number of outstanding conceptual and empirical mysteries, such as the naturalness of electroweak scale, the strong CP problem, the nature of dark matter (DM), and the origin of neutrino masses. Clearly the SM must be extended and become part of a deeper structure that will explain these shortcomings, with new physics beyond the SM expected to emerge at some high energy scale. I aim to test the SM itself and search for possible new physics at high-energy colliders such as the Large Hadron Collider (LHC) and other future collider programs (ILC, CLIC, CEPC/SPPC, FCC-ee/hh, muon colliders, etc.).
My main research interest lies in elementary particle physics theory, focusing on high-energy collider physics as well as connections to astro-particle physics and cosmology. While the Standard Model (SM) of particle physics provides a remarkably successful description of elementary matter and forces, it fails to address a number of outstanding conceptual and empirical mysteries, such as the naturalness of electroweak scale, the strong CP problem, the nature of dark matter (DM), and the origin of neutrino masses. Clearly the SM must be extended and become part of a deeper structure that will explain these shortcomings, with new physics beyond the SM expected to emerge at some high energy scale. I aim to test the SM itself and search for possible new physics at high-energy colliders such as the Large Hadron Collider (LHC) and other future collider programs (ILC, CLIC, CEPC/SPPC, FCC-ee/hh, muon colliders, etc.).
PhD students
Tommaso Armadillo
(member since January 2022)
I am working on the development of methods and tools to advance our ability to perform precision studies at colliders and apply them to key novel computations. In particular, we aim at introducing new techniques for two-loop integrals that are currently the bottleneck of next-to-next-to-leading order (NNLO) electroweak and use them to obtain predictions for Drell-Yan process at the LHC and for ZH production at future electron-positron colliders.
I am working on the development of methods and tools to advance our ability to perform precision studies at colliders and apply them to key novel computations. In particular, we aim at introducing new techniques for two-loop integrals that are currently the bottleneck of next-to-next-to-leading order (NNLO) electroweak and use them to obtain predictions for Drell-Yan process at the LHC and for ZH production at future electron-positron colliders.
Valentin Durupt
Studying particle physics phenomenology at colliders, Standard Model and Beyond with Effective Field Theory framework. Specialising in the use of Quantum Information (QI) observables (such as entanglement) to study fundamental interactions and their interpretation as QI processes.
Studying particle physics phenomenology at colliders, Standard Model and Beyond with Effective Field Theory framework. Specialising in the use of Quantum Information (QI) observables (such as entanglement) to study fundamental interactions and their interpretation as QI processes.
Simone Tentori
(member since January 2023)
I study particle physics phenomenology in colliders, both SM and BSM, with particular attention to top-philic interaction.
I study particle physics phenomenology in colliders, both SM and BSM, with particular attention to top-philic interaction.
Zeqiang Wang
(1) Improve the accuracy of the SMEFT predictions (2) Advance the SMEFiT technology (3) Perform global analyses of HEP data with optimal observables.
(1) Improve the accuracy of the SMEFT predictions (2) Advance the SMEFiT technology (3) Perform global analyses of HEP data with optimal observables.
Master students
Visitors
Interns
Former members
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:
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:
- 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.
- provide the experimentalists at the colliders with the means to simulate events occurring at the energy frontier.
Projects
Research directions:
Experiments and collaborations:
Active projects
Non-active projects
Experiments and collaborations:
Active projects
Advanced Multi-Variate Analysis for New Physics Searches at the LHC
Agni Bethani, Christophe Delaere, Andrea Giammanco, Vincent Lemaitre, Fabio Maltoni
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 have been part of AMVA4NewPhysics, a network of European institutions whose goal is to foster the development and exploitation of Advanced Multi-Variate Analysis for New Physics searches. The network offered between 2015 and 2019 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.
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 have been part of AMVA4NewPhysics, a network of European institutions whose goal is to foster the development and exploitation of Advanced Multi-Variate Analysis for New Physics searches. The network offered between 2015 and 2019 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
Chiara Arina, Fabio Maltoni
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).
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).
EFT@NLO
Céline Degrande, Fabio Maltoni
Implementation of the SMEFT at NLO in QCD in the Feynrules MadGraph5_aMC@NLO chain and phenomenological studies
External collaborators: Cen Zhang, Celine Degrande.
Implementation of the SMEFT at NLO in QCD in the Feynrules MadGraph5_aMC@NLO chain and phenomenological studies
External collaborators: Cen Zhang, Celine Degrande.
Electroweak corrections
Fabio Maltoni
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.
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.
FeynRules
Céline Degrande, Fabio Maltoni
An automated framework for BSM phenomenology that allows one to compute Feynman rules from a Lagrangian.
External collaborators: Céline Degrande (CERN) Benjamin Fuks (Jussieu).
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
Fabio Maltoni
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.
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
Fabio Maltoni, Olivier Mattelaer
Automation within MadGraph5_aMC@NLO and phenomenological studies of loop-induced processes for the LHC
Automation within MadGraph5_aMC@NLO and phenomenological studies of loop-induced processes for the LHC
MadGraph5_aMC@NLO
Fabio Maltoni, Olivier Mattelaer
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,...
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
Agni Bethani, Christophe Delaere, Vincent Lemaitre, Fabio Maltoni
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.
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
Fabio Maltoni
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.
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.
Non-active projects
via the marginal distributions of the the experimental weights 
.
Publications in IRMP
All my publications on Inspire
Number of publications as IRMP member: 143
Last 5 publications
More publications
Number of publications as IRMP member: 143
Last 5 publications
2024
IRMP-CP3-24-31: Quantum detection of new physics in top-quark pair production at the LHC
Maltoni, Fabio and Severi, Claudio and Tentori, Simone and Vryonidou, Eleni
[Abstract] [PDF] [Local file] [Journal] [Dial]
Refereed paper. October 22.
[Abstract] [PDF] [Local file] [Journal] [Dial]
Refereed paper. October 22.
IRMP-CP3-24-17: Top-quark pair production as a probe of light top-philic scalars and anomalous Higgs interactions
Maltoni, Fabio and Pagani, Davide and Tentori, Simone
[Abstract] [PDF] [Local file] [Journal] [Dial]
Refereed paper. June 10.
[Abstract] [PDF] [Local file] [Journal] [Dial]
Refereed paper. June 10.
2023
IRMP-CP3-23-74: Probing Higgs-muon interactions at a multi-TeV muon collider
Eugenia Celada,Tao Han, Wolfgang Kilian,Nils Kreher, Yang Ma, Fabio Maltoni, Davide Pagani, Jurgen Reuter, Tobias Striegl, and Keping Xie.
[Abstract] [PDF] [Local file] [Journal] [Dial]
Refereed paper. December 17.
[Abstract] [PDF] [Local file] [Journal] [Dial]
Refereed paper. December 17.
More publications