# Search for the Λb→Λη′ and Λb→Λη decays with the LHCb detector

Abstract : A search is performed for the as yet unobserved baryonic Λb→Λη′ and Λb→Λη decays with 3fb−1 of proton-proton collision data recorded by the LHCb experiment. The B0→K0Sη′ decay is used as a normalisation channel. No significant signal is observed for the Λb→Λη′ decay. An upper limit is found on the branching fraction of B(Λb→Λη′)<3.1×10−6} at 90\% confidence level. Evidence is seen for the presence of the Λb→Λη decay at the level of 3σ significance, with a branching fraction B(Λb→Λη)=(9.3+7.3−5.3)×10−6}.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01152154
Contributor : Sabine Starita <>
Submitted on : Friday, May 15, 2015 - 11:37:30 AM
Last modification on : Wednesday, September 16, 2020 - 4:28:27 PM

### Citation

R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Search for the Λb→Λη′ and Λb→Λη decays with the LHCb detector. Journal of High Energy Physics, Springer, 2015, 09 (006), ⟨10.1007/JHEP09(2015)006⟩. ⟨in2p3-01152154⟩

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