Angular analysis of the B0 pi+pi-mu+mu- decay mode at LHCb

This thesis explores rare particle decays involving bottom quarks, using data from the Large Hadron Collider collected between 2011 and 2018. It focuses on a detailed study of the B0 pi+pi-mu+mu- decay mode by examining how the resulting particles move and interact, which can reveal signs of new physics beyond the Standard Model of particle physics. These initial results offer a precise way to test current theories about how fundamental particles behave. The work builds on a deep field of research aimed at increasing our understanding of the universe at its most fundamental level.