Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 52: Flavour Physics III

T 52.7: Vortrag

Mittwoch, 2. April 2025, 17:45–18:00, VG 1.104

Studies of CP violation in D⁰ → π⁺ π⁻ π⁰ decays with the energy test method using LHCb Run 3 data — •Todor Todorov, Marco Gersabeck, Evelina Gersabeck, Florian Reiß, and Jan Karch — Albert-Ludwigs-Universität Freiburg, Freiburg im Breisgau, Germany

The standard model prediction for CP violation in the charm sector is relatively small and has a magnitude of the order of O(10⁻³ − 10⁻⁴). An observation of such violation has been made by the LHCb collaboration in D⁰ → hh decays, but this remains the only significant experimental evidence. D⁰ → π⁺ π⁻ π⁰ decays offer a promising candidate for studies of CP asymmetries, because they proceed via the same electroweak decay mode as the observation channel. Multibody decays also provide a 2 dimensional phase-space where different local contributions to CP violation can be observed even in the case of global CP symmetry. The energy test statistical method is chosen to search for local CP asymmetries due to its independence of model and choice of binning. An early study of the application of this statistical test to LHCb Run 3 data is presented, which is projected to benefit from a four-fold increase in data sample size in comparison to previous LHCb analyses.

Keywords: CP violation; Charm; LHCb