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T: Fachverband Teilchenphysik

T 44: Invited Topical Talks II

T 44.4: Invited Topical Talk

Wednesday, March 18, 2026, 15:15–15:45, MED 00.915

Search for CP violation in D⁰ → K_S⁰ K_S⁰ decays at the LHCb experiment — •Giulia Tuci — Heidelberg University

The study of CP violation in charm mesons provides a complementary probe of possible physics beyond the Standard Model with respect to beauty mesons, and allows the exploration of very high energy scales. The LHCb experiment has collected the largest sample of charm hadrons ever and in 2019 reported the first observation of CP violation analysing D⁰→ K⁺K⁻ and D⁰→ π⁺π⁻ decays, marking a milestone in flavour physics. However, the interpretation of this observation within the Standard Model is still under debate, making complementary experimental results essential to clarify the picture. In this presentation, a new measurement of the time-integrated CP asymmetry in the D⁰→ K_S⁰K_S⁰ decay will be presented. The analysis uses data collected by LHCb in 2024, inaugurating a new era enabled by the upgraded detector, which provides improved tracking, vertex resolution, and a fully software-based trigger, allowing unprecedented precision in charm physics.

Keywords: CP violation; Charm quark; LHCb experiment