Abstract
Testing the Standard Model of particle physics by precision measurements of CP violating observables in the decays of b and c hadrons has been one of the design goals of the LHCb experiment. World-leading measurements have been performed of the semileptonic asymmetry, , and of the mixing-induced CP-violating phase ϕs in the system. The CKM angle γ is still the least known angle of the Unitarity Triangle, and the only one easily accessible using tree-level decays. A recent combination of LHCb measurements in various B → DK decay modes has yielded the most precise determination of γ from a single experiment to date. The LHCb experiment is collecting unprecedented samples of beauty baryons, allowing for the first time to study CP violating observables in their decays. A recent analysis provided the first evidence for CP violation in the beauty baryon sector. Finally, LHCb has the largest samples of charmed hadron decays collected by any experiment to date. These samples yield some of the world’s most sensitive searches for direct and indirect CP violation in the charm sector.
Highlights
● comparison of precise measurements of CP phases with precise predictions from Standard Model calculations can reveal the presence of BSM physics
● these indirect searches for BSM Physics are sensitive to much higher mass scales than direct searches for new particles
● the pattern of observed deviations can hint at the structure of the BSM physics at work
Summary
● most Beyond-the-Standard-Model (BSM) physics models predict additional heavy particles. ● comparison of precise measurements of CP phases with precise predictions from Standard Model calculations can reveal the presence of BSM physics. ● these indirect searches for BSM Physics are sensitive to much higher mass scales than direct searches for new particles. ● classic example: discovery of CP violation in K0K0 → prediction of 3rd quark family in 1965 → direct observation of top quark in 1995. ● the pattern of observed deviations can hint at the structure of the BSM physics at work
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