Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 74: Flavour Physics V

T 74.5: Vortrag

Donnerstag, 3. April 2025, 17:15–17:30, VG 1.104

Mixing Phases and Penguin Effects in B Meson Decays — Kristof De Bruyn^1,2, Robert Fleischer^1,3, and •Eleftheria Malami⁴ — ¹Nikhef, Science Park 105, 1098 XG Amsterdam, Netherlands — ²Van Swinderen Institute for Particle Physics and Gravity, University of Groningen, 9747 Groningen, Netherlands — ³Faculty of Science, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, Netherlands — ⁴Center for Particle Physics Siegen (CPPS), Theoretische Physik 1, Universität Siegen, D-57068 Siegen, Germany

The phenomenon of B_q⁰–B_q⁰ mixing (q=d,s) provides a sensitive probe for exploring physics beyond the Standard Model. Associated with this mixing are the phases φ_d and φ_s, which are crucial for studies of CP violation. The decays B_d⁰ → J/ψ K⁰, B_s⁰ → J/ψ φ, and B_s⁰ → D_s⁺ D_s⁻ play significant roles in determining these mixing phases. However, these decays are affected by contributions from penguin topologies, which limit the theoretical precision in the extraction of these quantities. To properly account for these penguin effects, we introduce a formalism that utilises the CP asymmetries of these decays. By applying this strategy to the most recent experimental data, we provide updated insights. Moving towards the high-precision era, with experimental data becoming more precise, this approach can provide a much sharper picture of the underlying dynamics.

Keywords: flavour physics; B mesons; mixing phases; CP asymmetries; Standard Model