Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 31: Flavour physics II

T 31.2: Vortrag

Dienstag, 1. April 2025, 16:30–16:45, VG 1.104

Study of Entanglement and Coherence at Belle II — •Simeon Hamurcu, Hans-Günther Moser, Sagar Hazra, and Maximilian Kei Hattenbach — MPI for Physics, Munich

Belle II is a next generation B-factory that aims to precisely measure Standard Model (SM) parameters and conduct searches for New Physics (NP) beyond the Standard Model. Electrons and positrons are asymmetrically collided at center of mass energies around the Υ(4S)-resonance. This resonance mainly decays into a pair of B⁰-mesons. In time dependent measurements it is assumed that these pairs are produced in a coherent and entangled state. This assumption however has not yet been tested at Belle II and tests at the predecessor experiment Belle still do not exclude a partial disentanglement. It is therefore necessary to conduct further studies to exclude or quantify disentanglement.

We implement models of disentanglement by adapting software from the B⁰-lifetime and mixing frequency analysis. For that we compute and implement a new convolution to a resolution function of the Belle II detector and add additional disentanglement parameters to the software.

A validation is finally performed on signal Monte Carlo.

Keywords: Entanglement; Coherence; Belle II; EPR