Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 73: Flavour Physics IV

T 73.2: Vortrag

Donnerstag, 3. April 2025, 16:30–16:45, VG 1.103

Event separation at the Υ(5s) for entanglement studies — •Kilian Brückner — Max Planck Institut for Physics Garching

Upcoming analyses aim to study the quantum coherence (entanglement) of the B⁰ / B⁰ system at the Υ(5s) resonance. Doing this effectively requires the knowledge of how the Υ(5s) decayed, since the different decay channels have different entanglement properties. In this analysis the B⁰ / B⁰ system is reconstructed and later separated into the B⁰ / B⁰, B^0∗/B^0∗ and B^0∗/B⁰ decay channels. The separation is done mainly using the variables Δ E, which describes the difference between the beam energy and B-Meson energy, as well as M_bc, which describes the beam-energy-constrained mass. Since the Belle II Experiment has thus far not collected any data exactly on resonance of the Υ(5s), Belle I data is used for this analysis.

Keywords: Belle II; Disentanglement; B-Meson