Precision measurement of indirect CP violation in charm hadrons.
by
Michael Joseph Morello(PI)
→
Europe/Rome
Aula 131
Aula 131
Description
Charm hadrons provide the only sector involving up-type quarks where CP violation effects are expected to be observable. This uniqueness makes CP violation in charm particularly important to study, as it might be sensitive to effects beyond the Standard Model, which could leave other quarks unaffected. Asymmetry in the time-dependent rates of singly Cabibbo-suppressed D0->k+k- e D0->pi+pi- decays, the so called A parameter, is one of the most sensitive probe for indirect CP violation in the charm sector and can potentially be measured with great precision. The recent measurement of the A parameter with pp collision data collected by LHCb experiment in Run 1, corresponding to an integrated luminosity of 3 fb^-1, is presented here. This is the most precise measurement of a CP asymmetry in the charm sector with a statistical uncertainty reaching the sub-permille level and systematic uncertainties below the unprecedented level of 10^-4. Innovative experimental methodologies and new data analysis techniques have been used to achieve such a result, with the aim of allowing measurements of CP violation at even better precision in the near and far future experiments. Perspectives for CP violation searches in the charm sector with Run 2 data and beyond are also discussed.
