Göttingen 2025 – scientific programme
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T: Fachverband Teilchenphysik
T 31: Flavour physics II
T 31.1: Talk
Tuesday, April 1, 2025, 16:15–16:30, VG 1.104
Search for Quantum Disentanglement in the B0B0 system at Belle II — •Max Kei Hattenbach, Hans-Günther Moser, and Sagar Hazra — Max-Planck-Institute for Physics, Munich, Germany
B0B0 pairs produced at the Υ(4S) resonance are expected to be maximally entangled - an assumption crucial for measurements of time-dependent CP violation in experiments such as Belle, BaBar, and Belle II. If a fraction of these B0B0 pairs becomes disentangled, regardless of the underlying mechanism, it could introduce systematic uncertainties into analyses, which are currently not accounted for. In this study, we search for possible disentanglement effects by analysing the hadronic decay mode B0 → D(*)−π+ using Belle II data. A signature of disentanglement would be observed as a damping and/or phase shift in the measured time-dependent asymmetry, compared to the behaviour under maximally entanglement. By examining decay time difference (Δt) of the two B mesons, we aim to test the sensitivity for time-dependent CP violation measurements using Monte Carlo studies.
Keywords: Quantum Entanglement; B-Physics; Belle II; Flavour Physics; Time-dependent CP Violation