Quantum entanglement at the psi(3770) and Upsilon(4S)

Details Quantum entanglement at the psi(3770) and Upsilon(4S) Quantum entanglement at the psi(3770) and Upsilon(4S)

2008-10-10

arxiv.org/abs/0810.1822v1

Physics

High Energy Physics

High Energy Physics - Experiment

Flavor Physics & CP Violation Conference, Taipei, 2008. Includes 8 pages, 10 figures, 1 table

Scientific paper

We review results which explicitly depend on the entanglement of neutral meson pairs produced at the psi(3770) and Upsilon(4S). Time-dependent CP-violation analyses at the B-factories use the flavour-singlet final state at the Upsilon(4S), but by assuming its quantum-mechanical evolution; Belle on the other hand has tested the time-dependent flavour correlation of the B-mesons, comparing predictions of quantum mechanics, spontaneous disentanglement, and Pompili-Selleri models. At the psi(3770), decay rates are modulated by various combinations of the charm mixing parameters: this has been exploited by CLEO-c to provide the first effective constraint on the strong-phase difference delta. Finally, the goal of a "model-independent" phi_3/Dalitz analysis is now within reach, using D-mesons from the psi(3770) to constrain the D0 -> K_S pi+ pi- decay amplitude. Manifestly entangled events psi(3770) -> (K_S pi+pi-)_D (K_S pi+ pi-)_D, rather than just "CP-tagged" decays, turn out to be crucial.

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