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|
Bibliographical noteFunding Information:
The work of C.S.K. was supported in part by CHEP-SRC Program, and in part by Grant No. R02-2003-000-10050-0 from BRP of the KOSEF. The work of S.O. was supported by the Japan Society for the Promotion of Science (JSPS). The work of C.Y. was supported by Grant No. F01-2004-000-10292-0 of KOSEF-NSFC International Collaborative Research Grant. M.R.A. is grateful to the Natural Sciences & Engineering Research Council of Canada (NSERC) for financial support.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics