Baptiste Ravina

Baptiste Ravina

Senior Research Fellow

CERN

ATLAS Experiment

Particle physics. Machine learning. ATLAS.

I am a Fellow of CERN, the European Organisation for Nuclear Research. I focus on searching for new physics at the Large Hadron Collider with the ATLAS experiment, using precision measurements of the top quark and machine learning tools.

Education
  • PhD in Experimental Particle Physics, 2020

    University of Sheffield (UK)

  • Part III Maths, 2016

    University of Cambridge, DAMTP (UK)

  • BSc in Physics & Philosophy, 2015

    King's College London (UK)

Research interests
  • psychology Machine Learning
  • insights Likelihood-free Inference
  • filter_tilt_shift Anomaly detection
  • blur_on Effective Field Theory
  • join_inner Quantum entanglement
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Experience

 
 
 
 
 
CERN
Senior Research Fellow
September 2024 – Present Geneva (CH)

My CERN fellowship is split between my work on the ATLAS experiment at the LHC and preparations for the future ALLEGRO detector at the FCC. My research focuses on connecting quantum information theory with particle physics, particularly in the top quark and Higgs boson sectors. I am also involved in performance studies of tile calorimeters for FCC.

Other responsibilities include:

  • Leading the ATLAS Top Properties & Mass subgroup
  • Developing analysis software pipelines towards the High-Luminosity LHC
 
 
 
 
 
Alexander von Humboldt Foundation
Research Fellow
April 2022 – August 2024 Göttingen (DE)

During my Humboldt fellowship, I studied the electroweak couplings of the top quark: $t\bar{t}Z$, $tZq$, $tWZ$ and $t\bar{t}\gamma$. Besides my contributions to the measurement of these Standard Model processes with the ATLAS experiment, I led their interpretation in the framework of Effective Field Theory. With colleagues from the CMS collaboration, I prepared the very first cross-experiment combination of top+X results. Last but not least, I helped set up the first efforts on quantum entanglement and the violation of Bell’s inequalities in top quarks and Higgs bosons.

Other responsibilities included:

  • Supervision of BSc, MSc and PhD students
  • Teaching of specialised MSc courses (particle physics labs, top quark physics)
  • Organisation of the HASCO'22 and HASCO'23 summer schools
  • Leading the ATLAS Top Reconstruction subgroup
 
 
 
 
 
The Royal Society of Edinburgh
Saltire Early Career Fellow
September 2021 – March 2022 Glasgow (UK)
The focus of my RSE fellowship was on measuring the spin correlations of top quarks in associated production with a $Z$ boson ($t\bar{t}Z$). In my related phenomenological paper, I used Monte Carlo generators to predict this quantum property of top quarks in the Standard Model, highlighted how it differs from the more common $t\bar{t}$ case, and showed how to interpret any deviation from these predictions in the framework of Effective Field Theory.
 
 
 
 
 
University of Glasgow
Post-Doctoral Research Associate
April 2020 – August 2021 Glasgow (UK)

I led the legacy $t\bar{t}Z$ ATLAS measurement and contributed to the first measurement of the $t\bar{t}$ spin density matrix with the full Run 2 dataset; for both analyses, I developed an extensive Effective Field Theory fitting framework in the Julia language. I was also involved in background estimations for a combination of Dark Matter searches with $t\bar{t}+E_\mathrm{T}^\mathrm{miss}$ signatures, as well as prototyping an auto-encoder for an Anomaly Detection based search for new physics.

Other responsibilities included:

  • Supervision of MSc and PhD students
  • Summarising ATLAS and CMS $t\bar{t}+X$ results for the LHC Top working group
  • Supporting the ATLAS Top group in Monte Carlo generation
  • Acting as ATLAS Trigger online expert and online release coordinator
 
 
 
 
 
The Institute of Physics
Committee Member, High Energy Particle Physics group
April 2018 – April 2022
  • Funding assistance for UK HEP workshops
  • Organisation of the yearly Astrophysics + HEP conference
  • Liaison with UK students
  • Outreach activities

Meet the team!

Main collaborators

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James Howarth

University of Glasgow

University Research Fellow (Royal Society)

Quantum entanglement

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Jonathan Jamieson

University of Glasgow

Postdoc (quantumTANGO)

Quantum entanglement

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Steffen Korn

University of Göttingen

Postdoc (quantumTANGO)

Quantum entanglement

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Arnulf Quadt

University of Göttingen

Professor of Experimental Particle Physics

Top physics

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Elizaveta Shabalina

University of Göttingen

Senior Researcher

Top physics

Alumni

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Siemen Aulich

Quantum entanglement in $H^*\to ZZ$
BSc 2023

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George Dialektakis

Anomaly detection
CERN / Google Summer of Code 2021

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Stephen Eggebrecht

PhD 2025 $t\bar{t}H$ in the $4\ell$ channel
(post-doctoral supervision for Prof. Arnulf Quadt)

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Clinton Gonsalves

Intern 2024 $t\bar{t}H(\to WW^*)$ with 1 lepton

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Honey Gupta

Anomaly detection
CERN / Google Summer of Code 2020, then Applied Scientist at Amazon

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Tobias Henne

$t\bar{t}$ modelling for entanglement
BSc 2023

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Sophia Pennuttis

Background modelling in $t\bar{t}\gamma\gamma$
BSc 2022

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Sebastian Preuth

MSc 2024 $t\bar{t}Z$ and $tZq$

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Ireas Tom Raschke

MSc 2024 $t\bar{t}H(\to WW^*)$ with 1 lepton
BSc 2022 $t\bar{t}Z$ and $t\bar{t}W$

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Theresa Reisch

MSc 2024 $t\bar{t}$ quantum entanglement
BSc 2022 $t\bar{t}$ spin correlations

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Tim Schlömer

MSc 2024 ML for lepton isolation
BSc 2022 $tZq$ EFT

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Varsha Senthilkumar

Machine learning in SUSY
MSc 2019, then PhD IFIC Valencia

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Hassan Shahid

Anomaly detection
MSc 2021-2022

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Craig Shewry

EFT & machine learning
MSc 2021-2022

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Ethan Simpson

PhD 2023 EFT & spin correlations, then Post-Doc Manchester
(post-doctoral supervision for James Howarth)

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Sreelakshmi Sindhu

PhD 2025 EFT in top+X processes
(post-doctoral supervision for Prof. Arnulf Quadt)

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Marija Vaškevičiūtė

Anomaly detection
MSc 2020–2021, then PhD Glasgow

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Daniel Werner

MSc 2024 Run 3 software development & top+X EFT
BSc 2022 $tZq$ polarisation

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Kia-Jung Yang

2023 Graph neural networks
BSc 2022 $t\bar{t}Z$ and $tZq$

Get in touch