Extracting gamma from B-d(0)(t)-> D(*)+D(*)- and B-d(0)-> Ds(*)+D(*)- decays

摘要

We show that the CP phase gamma can be obtained from measurement, of B-d(0)(t) --> D-(*D-)+(()*()-) and B-0(d) --> D-s(()*()+) D-(*()-). These decays are related by flavor SU(3) in the limit where spectator-quark contributions are small. If the pseudoscalar-pseudoscalar decays B-d(0)(t) --> D+D- and B-d(0) --> Ds+D- are used, the leading-order SU(3)-breaking effect is f(Ds)/f(D). dependence on decay constants can be removed by using a double ratio involving two helicity states of the vector-vector decays B-d(0) --> D*D+*(-) and B-d(0) --> D-s*D+*(-). In this case the theoretical error arising from all sources is in the range 5-10%. (C) 2004 Elsevier B.V. All rights reserved. [References: 37]