Géraldine Räuber

I'm a physicist specializing in particle physics, having recently completed my PhD as part of the Belle II collaboration. My research has taken me deep into the world of high-energy experiments, where I’ve worked with large datasets and complex analytical methods to study fundamental particles.

Along the way, I’ve developed strong programming skills and a passion for coding, which I apply to everything from data analysis to creating tools that (hopefully) solve everyday problems.

I enjoy taking on coding projects that challenge me to think critically and creatively, whether it’s optimizing algorithms or exploring new applications of machine learning. I’m always looking for opportunities to collaborate, learn, and contribute to exciting new ideas.

When I’m not immersed in physics or coding, you can find me playing the flute, keeping my plants alive, or experimenting in the kitchen.

PhD Thesis

In case you want to know more about my PhD analysis, here is my thesis and its abstract.

This thesis presents a precise measurement of the CKM matrix element \(V_{us}\) using data collected at the Belle II experiment situated at the SuperKEKB electron-positron collider in Tsukuba, Japan. The measurement employs the ratio of branching fractions of tau lepton decays, denoted as \(R_{K/\pi}\), with both pion and kaon mesons in the final state, given by \[R_{K/\pi} = \mathcal{B}(\tau \to K \nu_\tau)/\mathcal{B}(\tau \to \pi \nu_\tau).\] Selection criteria involve a tag side consisting of three charged particles, defining an overall 3x1- prong topology. The preliminary obtained result, \(R_{K/\pi}\) = 0.06438 ± 0.00080, corresponds to a \(|V_{us}|\) value of 0.2229 ± 0.0017, and takes into account only the main systematic uncertainty sources. Recognizing the systematic nature of this measurement, a dedicated study addressing leading systematic uncertainties is undertaken. Specifically, a performance assessment of pion identification corrections is conducted to enhance the reliability and precision of the measurement.

As my university did not allow PhD candidates to correct their thesis, I propose here an Errata.

Academic and Research Contributions

As I wanted to keep my CV sufficiently concise, you'll find below some information about my academic background that wasn't included.

Publications

Test of light-lepton universality in tau decays with the Belle II experiment
August 2024, JHEP08(2024)205

Results of the 2022 ECFA Early-Career Researchers Panel survey on career prospects and diversity
April 2024, arXiv:2404.02074

Recent tau and dark-sector results at Belle II
November 2023, Proceedings of Science

Search for an Invisible Z' in a Final State with Two Muons and Missing Energy at Belle II
June 2023, Phys.Rev.Lett.130,231801

The ECFA Early Career Researcher's Panel: composition, structure, and activities, 2021 -- 2022
December 2022, arXiv:2212.11238

Snowmass White Paper: Belle II physics reach and plans for the next decade and beyond
September 2022, ArXiv2207.06307

Talks

Measurement of |Vus| and Lepton Flavour Universality (LFU) test using 3x1-prong tau decays
June 2024, Tsukuba (Japan), Remote from Vienna (Austria), Belle II General Meeting (B2GM)

Status of |Vus|
June 2024, Tsukuba (Japan), Remote from Vienna (Austria), Belle II General Meeting (B2GM)

Hadron ID Systematics from tau Decays
January 2024, Tsukuba (Japan), Remote from Vienna (Austria), Belle II General Meeting (B2GM)

Status of |Vus|
October 2023, Tsukuba (Japan), Belle II General Meeting (B2GM)

Recent tau and dark-sector results at Belle II
May - June 2023, Lyon (France), 21st Conference on Flavor Physics and CP Violation (FPCP 2023)

Particle identification (PID) and precision tau physics at Belle II
November 2022, Prague (Czech Republic), Jennifer2 General Meeting

hID performance in tau decays
October 2022, Rome (Italy), Belle II General Meeting (B2GM)

Grants

Multilateral Scientific and Technological Cooperation in the Danube region
July 2023 - June 2025, Austria - Czech Republic - France, Travel grant

Les Rencontres de Moriond, QCD session
March 2023, La Thuile (Italy), Conference grant

La Thuile 2023 - Les Rencontres de Physique de la Vallée d'Aoste
March 2023, La Thuile (Italy), Conference grant

Volunteering

XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP 2023)
August - September 2023, Vienna (Austria)

Dark Matter day 2022
October 2022, Vienna (Austria)

IPA2022: Interplay between Particle and Astroparticle physics 2022
September 2022, Vienna (Austria)

Lange Nacht der Forschung (tr. long night of research)
May 2022, Vienna (Austria)