- Name
- Fabio Maltoni

- Position
- Professor

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- 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

- Phone
- +32 10 4
**7 3166**

- Office
- E.247

- My personal homepage

- UCL member card

- Quantum Mechanics

- Relativistic Quantum Mechanics

- Electroweak interactions
- PHY2224

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.

- Research scientists
- Olivier Mattelaer (UCL), member since September 2005Responsible software maintenance and development of MadGraph 5, AM
document.write('C' + ls_123 + 'N'); LO (including MadSpin and ALOHA). Study of new experimental approaches using the matrix element re-weighting.

- Postdocs
- Ken Mimasu (PAI, MSCA), member since October 2016Collider 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 2016I 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 2016I work in the area of collider physics. My current research interests include precision calculations and phenomenology of new physics using effective field theories.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.

- Visitors

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

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.

- 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).

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Implementation of the SMEFT at NLO in QCD in the Feynrules MadGraph5_aM

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.

#### FeynRules

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_aM

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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.

#### 2017

*Maltoni, Fabio and Pagani, Davide and Shivaji, Ambresh and Zhao, Xiaoran*

[Abstract] [PDF] [Full text] Submitted to EPJC.

Refereed paper. 18th September.

*Nicolas Deutschmann, Claude Duhr, Fabio Maltoni, Eleni Vryonidou*

Submitted to JHEP.

Refereed paper. 31st July.

#### 2016

*Federico Demartin, Benedikt Maier, Fabio Maltoni, Kentarou Mawatari, Marzo Zaro*

to be submitted to JHEP

Refereed paper. 19th July.

*Fabio Maltoni, Eleni Vryonidou, Cen Zhang*

to be submitted to JHEP

Refereed paper. 18th July.