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.