科研之友
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摘要
About 90% of B-s(B) over bar (s) pairs produced at the Y(5s) resonance are initially B-s*(B) over bar (s)* pairs which decay radiatively to B-s(B) over bar (s). This implies that the B-s(B) over bar (s) 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 of Delta Gamma(s)/Gamma(s) and the CP phase using a number of possible correlations between the decays of the two B-s mesons. In particular, we consider the time integrated correlation, the time ordering asymmetry, and the time ordering-charge asymmetry, which in addition to time ordering distinguishes B-s from (B) over bar (s), for various combinations of final states. With the statistics of about O(10(7)-10(8)) Y(5s) events available at B factories, we find that the time ordering asymmetry between suitably defined hadronic and flavor specific (tagging) decays offers a promising method for determining the width difference. The corresponding time ordering-charge asymmetry can also bound the mixing phase. Similar observables involving exclusive decays are also considered. At the super B factories with O(50) times greater luminosity time ordering and time ordering-charge asymmetries between inclusive and exclusive modes may also provide additional bounds on the phases in those decays.
- 出版日期2010-8-10
