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The neutral B-meson pair produced at the Upsilon(4S) should exhibit anon-local correlation of the type discussed by Einstein, Podolski, and Rosen(EPR). We measure this correlation using the time-dependent flavour asymmetryof semileptonic B0 decays, which we compare with predictions from quantummechanics and two local realistic models. The data are consistent with quantummechanics, and inconsistent with the other models. Assuming that some B pairsdisentangle to produce B0 and B0bar with definite flavour, we find a decoherentfraction of 0.029+-057, consistent with no decoherence.Comment: 8 pages, 2 figures, submitted to Phys. Rev. Let

physical review letters

Measurement of Einstein-Podolsky-Rosen-Type Flavor Entanglement in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Υ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4</mml:mn><mml:mi>S</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mo>→</mml:mo><mml:msup><mml:mi>B</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:msup><mml:mover accent="true"><mml:mi>B</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup></mml:math>Decays

Measurement of Einstein-Podolsky-Rosen-Type Flavor Entanglement inΥ(4S)→B0B¯0Decays