Bruce Yabsley (University of Sydney): "Testing, and using, quantum entanglement at the B-factories"

Monday 18 May 2009, 14:15 → 15:45 Europe/Berlin

3344 - Physics Department TUM Garching

Neutral B-mesons are produced in entangled pairs at the B-factories by the decay of the Upsilon(4S) resonance. The particles are in a flavour singlet, analagous to the EPR-Bohm state. This beautiful piece of quantum mechanics is taken for granted in the flagship CP-violation measurements, but a number of other studies make explicit use of entanglement. I will review this work, with emphasis on the entanglement test performed by Belle, and the developing synergy between Dalitz analysis at the B-factories (relying on interference in B-decays) and at CLEO-c (relying on their own entangled state) in measuring the unitarity angle phi_3. The issues run the gamut from the details of flavour tagging, through methods for handling limited data, to the interpretation of quantum mechanics.

document Yabsley_180509.pdf