We calculate the branching ratios of the hadronic Λb decays to η and η′ in the factorization approximation where the form factors are estimated via QCD sum rules and the pole model. Our results indicate that, contrary to B→Kη(′) decays, the branching ratios for Λb→Λη and Λb→Λη′ are more or less the same in the hadronic Λb transitions. We find that the anomaly contribution is crucial in Λb→Λη(′) decays. We obtain the branching ratio of Λb→Λη(′) to be 11.47(11.33)×10-6 in QCD sum rules, and 2.95(3.24)×10-6 in the pole model. We also consider the contribution of the charm content in the η′ production in Λb→Λ transition.
|Number of pages||8|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2004 Sep 30|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics