Abstract:

The study of CP violation (CPV) is crucial for understanding the matter-antimatter asymmetry in the universe. In this talk, we will delve into the phenomenology of CP violation in B mesons, with a special emphasis on the Bs to J/Psi Phi decay, a flagship CPV analysis at the LHC. This process is the golden channel for examining CP violation in the interference between direct decays and flavour mixing, providing a sensitive probe of the Standard Model and potential new physics. We will review the theoretical framework and key historical milestones that have shaped our understanding of CPV.

We will compare the different approaches taken by the CMS and LHCb collaboration, both in the analysis philosophies and specific techniques employed. Additionally, we will explore the prospects for CPV studies at the HL-LHC, including the expected improvements in sensitivity and precision. We will also discuss the challenges posed by the increased precision, such as the pollution from higher-order penguin contributions that could conceal new physics signals.

Alberto Bragagnolo (CMS) obtained his PhD in 2021 at the University of Padova. He held a postdoctoral position there before joining CERN as a Research Fellow in 2024. His research focuses on the physics of flavor mixing and CP violation, with a particular emphasis on flavor tagging techniques. His current interests include expanding the CMS program at Run-3 and beyond, particularly in the areas of the CKM matrix and CP violation. He is the convener of the CMS B-Physics group "Violation of Fundamental Symmetries", which coordinates CP violation and LFU test activities within CMS.

Veronika Chobanova (LHCb) obtained her PhD in 2015 at the Luwdwig Maximilian University of Munich based on her work on Belle measurements of mixing-induced CP violation at the Max Planck Institute for Physics. Currently, she holds a Ramón y Cajal grant at the University of A Coruña. She joined LHCb in 2015 as a postdoctoral researcher at the University of Santiago de Compostela. She has contributed to the Run 2 measurements of Bs0->J/psi Phi decays and to rare kaon measurements. Her research now focuses on advancing flavour tagging techniques, with an emphasis on applying them to future Bs0->J/psi Phi measurements.