Extracting \gamma from Bd(t) -> D(*)+ D(*)- and Bd -> Ds(*)+ D(*)- Decays

Alakabha Datta; David London

doi:10.1016/j.physletb.2003.12.048

Extracting \gamma from Bd(t) -> D()+ D()- and Bd -> Ds()+ D()- Decays

High Energy Physics - Phenomenology 2009-11-10 v3 High Energy Physics - Experiment

Authors: Alakabha Datta , David London

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Abstract

We show that the CP phase \gamma can be obtained from measurements of Bd(t) -> D(*)+ D(*)- and Bd -> Ds(*)+ D(*)-. These decays are related by flavor SU(3) in the limit where spectator-quark contributions are small. If the pseudoscalar-pseudoscalar decays Bd(t) -> D+ D- and Bd -> Ds+ D- are used, the leading-order SU(3)-breaking effect is f_Ds/f_D. The dependence on decay constants can be removed by using a double ratio involving two helicity states of the vector-vector decays Bd(t) -> D*+ D*- and Bd -> Ds*+ D*-. In this case the theoretical error arising from all sources is in the range 5-10%.

Keywords

qcd corrections in b decays ckm matrix b meson physics

Cite

@article{arxiv.hep-ph/0310252,
  title  = {Extracting \gamma from Bd(t) -> D(*)+ D(*)- and Bd -> Ds(*)+ D(*)- Decays},
  author = {Alakabha Datta and David London},
  journal= {arXiv preprint arXiv:hep-ph/0310252},
  year   = {2009}
}

Comments

11 pages, latex, no figures. Added a paragraph and 2 references comparing SU(3) breaking in D and B decays. Conclusions and method unchanged