There is an apparent excess of matter over antimatter in the Universe. To generate this imbalance, Sakharov postulated three conditions one of which is a violation of the charge-parity (CP) symmetry. The charge-parity CP operator transforms a particle into its antiparticle and reverses the spatial coordinates of the physical system: properties such as the momentum, the helicity, and the electrical charge, are mirrored under this transformation. The principle of CP symmetry states that all processes must remain unchanged under a CP operation. The violation of this symmetry (CPV) is one of the conditions required to create the observed asymmetry between matter and antimatter in our universe. Within the SM all CPV in the quark sector is encoded in a single phase in the Cabibbo-Kobayashi-Maskawa (CKM) 3, 4 quark mixing matrix. However, The SM cannot explain the scale of the observed excess of cosmic matter over antimatter in our Universe, giving a prediction too small by several orders of magnitude. This is one of the most important fundamental puzzles, closely connected to our very existence. Therefore, it is of utmost importance to look for new sources of CP asymmetry. Finding and studying new sources of matter antimatter asymmetry in particles containing charm quarks is the holy grail of this field of research and is the focus of this proposal.
This proposal consists of the following objectives, of equal importance:
1. To develop a model-independent unbinned method to extract the information of the strong phase variation in every point of phase space of the D0->KSπ+π- decays using QE charm meson pair data collected by the BESIII experiment, and to apply this information to measurements of the charm mixing and CP violation at the LHCb experiment.
2. To search for direct CP violation of charm two-body decays D0 -> K*0KS and D0 -> anti-K*0KS at the LHCb experiment using the full available data sample collected during LHC Run 1 and Run 2 exploiting two different techniques.
