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About 90% of Bs-bar Bs pairs produced at the Upsilon(5s) resonance areinitially Bs*-bar Bs* pairs which decay radiatively to Bs-bar Bs. This impliesthat the Bs pair will then be in an eigenstate of charge conjugation (i.e.C=-1) and therefore in an entangled state. This allows for a determination ofDelta Gamma/Gamma and the CP phase using a number of possible correlationsbetween the decays of the two Bs mesons. In particular, we consider the timeintegrated correlation; the time ordering asymmetry and the timeordering-charge asymmetry, which in addition to time ordering distinguishes Bsfrom Bs-bar, for various combinations of final states. With the statistics ofabout O(10^7-10^8) Upsilon(5s) events available at B factories, we find thatthe time ordering asymmetry between suitably defined hadronic and flavorspecific (tagging) decays offers a promising method for determining the widthdifference. The corresponding time ordering-charge asymmetry can also bound themixing phase. Similar observables involving exclusive decays are alsoconsidered. At the super B factories with O(50) times greater luminosity timeordering and time ordering-charge asymmetries between inclusive and exclusivemodes may also provide additional bounds on the phases in those decays;

Measuring Bs Width Difference at the Upsilon(5s) Using Quantum Entanglement