HEP Colloquia 2025

by Giulia Tuci (Heidelberg University)

Monday 1 Dec 2025, 14:30 → 15:30 Europe/Rome

Sala Consiliare (Department of Physics)

Measurement of CP asymmetry in D⁰→K⁰_SK⁰_S decays with the upgraded LHCb detector 

The study of CP violation in charm mesons provides a complementary probe for possible interactions beyond the Standard Model with respect to beauty mesons, and allows the exploration of even higher energy scales. The LHCb experiment collected the largest sample of charm hadrons ever, order of billions of decays, and reported the first observation of CP violation in D⁰→K⁺K^- and D⁰→ π ⁺ π  ^{π -} decays in 2019, marking a milestone in flavour physics.  However, the compatibility of the observation with the Standard Model is still debated, and providing complementary experimental results is a crucial step towards clarifying the physics picture. In this seminar, a new measurement of the time-integrated CP asymmetry in the decay D₀->KsKs will be presented. The analysis has been performed using data collected by the LHCb experiment in 2024. The analysis is based on data collected by the LHCb experiment in 2024, using the upgraded detector with improved tracking, vertex resolution, and a software-based trigger system. Thanks to these improvements, unprecedented precision in charm physics can now be achieved.