Baptiste Ravina

Senior Research Fellow · CERN · ATLAS Experiment

Searching for new physics at the Large Hadron Collider through precision measurements of the top quark, quantum information at high energies, and machine learning. Recently observed toponium formation and quantum entanglement in top quarks
— what else might be hiding in the data?

Top quark Quantum information Beyond the Standard Model Machine learning Effective field theory Simulations

Experimental characterization of the hierarchy of quantum correlations in top quark pairs

Y. Afik, B. Ravina, et al.

arXiv BibTeX

Submitted to Rept. Prog. Phys. · 2026

Observation of a cross-section enhancement near the $t\bar{t}$ production threshold in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector

ATLAS Collaboration

arXiv ATLAS BibTeX

Nature · 2024

Observation of quantum entanglement with top quarks at the ATLAS detector

ATLAS Collaboration

arXiv DOI ATLAS Briefing CERN Courier BibTeX

Research

What I work on

$\langle \Psi\rvert$

Quantum information science at colliders

First observation of entanglement in bare quarks and at very high energies. Studying further links between quantum information observables and collider physics, in the top and Higgs sectors.

Top quark electroweak couplings

Precision measurements of rare top processes. SMEFT interpretations and ATLAS+CMS combinations.

ML & anomaly detection

Benchmarking unsupervised models for model-independent new physics searches at the LHC. Deploying novel architectures to tackle difficult reconstruction problems.

Analysis software for Run 3

TopCPToolkit and next-gen analysis pipelines for ATLAS towards the High-Luminosity LHC.

Senior Research Fellow

CERN

Led the ATLAS Top Properties & Mass subgroup. Observation of an excess in top quark pair production at threshold. Simulations of a tile calorimeter for the ALLEGRO detector concept at the FCC.

2022 – 2024

Humboldt Research Fellow

Alexander von Humboldt Foundation · Göttingen

Led the ATLAS Top Reconstruction subgroup and developed TopCPToolkit. Measurements and EFT interpretations of $t\bar{t}Z$, $tZq$, $tWZ$ and $t\bar{t}\gamma$. Quantum entanglement and Bell inequalities in top quarks and Higgs bosons.

2021 – 2022

Saltire Early Career Fellow

Royal Society of Edinburgh · Glasgow

Measured the spin correlations of top quarks in associated production with a $Z$ boson ($t\bar{t}Z$), leading to the first phenomenological predictions and novel EFT constraints from angular observables.

2020 – 2021

Post-Doctoral Research Associate

University of Glasgow

Led the legacy ATLAS $t\bar{t}Z$ Run 2 measurement and contributed to the measurement of the $t\bar{t}$ spin density matrix. Developed an EFT fitting framework and prototyped anomaly-detection auto-encoders for the Dark Machines initiative.

2018 – 2022

Committee Member, High Energy Particle Physics Group

Institute of Physics · UK

Funding assistance for UK HEP workshops, organisation of the yearly Astrophysics + HEP national conference, liaison with students, outreach activities.

2016 – 2020

PhD, Experimental Particle Physics

University of Sheffield

Thesis: Measurement of the top quark coupling to the Z boson, and applications to searches for physics beyond the Standard Model.
Advisors: Prof. Daniel Tovey & Prof. Davide Costanzo.

2015 – 2016

MASt in Applied Mathematics

University of Cambridge, DAMTP

2012 – 2015

BSc Physics & Philosophy

King's College London

Get in touch

Let's work together

Open to new collaborations and student projects.

baptiste.ravina@cern.ch