Martin Sobotzik successfully completed his doctoral thesis on Angular Analysis of the B → K*ℓℓ Decay in Long Shutdown 1 Data at Belle II.
In his analysis he is looking for signs of physics beyond the standard model in flavour-changing neutral currents (FCNC) where a B meson decays into a kaon and two leptons. Since this decay can only occurr in loop diagrams, it is heavily suppressed.
He therefore investigated the use of neural networks to select these rare events from Belle II data collected until the Long Shutdown 1. Furthermore, using advanced statistical tools, he could improve the background subtraction compared to the traditional approach of extracting the background shape from simulations, thus decreasing systematic effects.
Congratulations!