Anatomy of B -> D<(D)over bar> decays

作者：Bel Lennaert^*; De Bruyn Kristof; Fleischer Robert; Mulder Mick; Tuning Niels

来源：The Journal of High Energy Physics, 2015, 2015(7): 108.

DOI：10.1007/JHEP07(2015)108

• B-Physics
• CP violation

The decays B-d(0) -> Dd-Dd+ and B-s(0) -> Ds-Ds+ probe the CP-violating mixing phases phi(d) and phi(s), respectively. The theoretical uncertainty of the corresponding determinations is limited by contributions from penguin topologies, which can be included with the help of the U -spin symmetry of the strong interaction. We analyse the currently available data for B-d,s(0) -> Dd,s-Dd,s+ decays and those with similar dynamics to constrain the involved non-perturbative parameters. Using further information from semileptonic B-d(0) -> D(d)(-)l(+)v(l) decays, we perform a test of the factorisation approximation and take non-factorisable SU(3)- breaking corrections into account. The branching ratios of the B-d(0) -> Dd-Dd+, B-s(0) -> DsDd+ and B-s(0) -> Ds-Ds+, B-d(0) -> Dd-Ds+ decays show an interesting pattern which can be accommodated through significantly enhanced exchange and penguin annihilation topologies. This feature is also supported by data for the B-s(0) -> Dd-Dd+ channel. Moreover, there are indications of potentially enhanced penguin contributions in the B-d(0) -> Dd-Dd+ and B-s(0) -> Ds-Ds+ decays, which would make it mandatory to control these effects in the future measurements of phi(d) and phi(s). We discuss scenarios for high-precision measurements in the era of Belle II and the LHCb upgrade.

• 出版日期2015-7-21