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The Standard Model does not incorporate enough CP (charge parity) violation to explain the matter-antimatter asymmetry observed in the universe. CP violation is well established in the beauty and kaon sectors but was only discovered in charm in 2019. Mixing is the time-dependent phenomena of a neutral meson changing into its antiparticle and vice-versa. Mixing and CP violation are highly suppressed in charm and theoretical predictions are challenging. Precision measurements of mixing and CP violation in charm are a unique probe into potential new CP violating processes in the up-type sector. This motivates precision measurements in both direct and indirect CP violation in charm.
The LHCb detector at the LHC is specifically designed for the study of heavy flavour physics. The production cross section of charm at the LHC is large (~20 times larger than that of beauty). This as well as the dedicated software triggers and excellent vertex resolution make the LHCb detector an excellent environment to study mixing and CP violation in charm.
In my talk I will present the discovery mode of CP violation in charm, the so-called delta ACP measurement. I will present the first observation of the non-zero mass difference in neutral charm mesons which was published last year and was in the D0->KSpipi channel. The self-conjugate decay D0->KSpipi is the so-called “Golden Mode” in mixing in charm since it offers direct access to both the mixing and CP violation parameters through a time and phase space dependent analysis of this three body decay. I will conclude with future prospects for mixing and CP violation in charm.
The seminar will be given in person in Niels Bohr, Schuster. For those connecting remotely please use:
https://zoom.us/j/97041428849
Meeting ID: 970 4142 8849
Passcode: 6275