Beauty from every angle

This thesis focuses on the study of rare decays of beauty mesons, specifically the decay B0->K*0e^+e^-, using data collected during LHC Run1 and Run2 with the LHCb experiment at CERN. These processes, known as flavour-changing neutral currents, are highly suppressed in the Standard Model and thus particularly sensitive to potential contributions from physics beyond the Standard Model.

The core objective of my project is to investigate this decay channel by measuring angular observables in three regions of the di-electron invariant mass squared ($q^{2$): [1.1−6.0] $GeV^{2}/c^{4}$ and the two sub-regions [1.10−3.65] and [3.65−6.00] $GeV^{2}/c^{4}$. This is achieved through a comprehensive analysis pipeline which includes data selection, background suppression, optimization using machine learning techniques (such as boosted decision trees), and the construction of an angular fit model that incorporates detector effects through an acceptance function.

While the final angular distributions in data remain blinded to avoid experimental biases, the aim of my thesis is to evaluate the expected sensitivity - both in terms of statistical and systematic uncertainties - to the angular coefficients in each $q^{2}$ region. These measurements contribute to ongoing efforts in experimental particle physics to test the limits of the Standard Model and search for potential indirect signatures of physics beyond the Standard Model through precision measurements.