# Observation of the $\Lambda_b^0\to\Lambda\phi$ decay

Abstract : The $\Lambda_b^0\to\Lambda\phi$ decay is observed using data corresponding to an integrated luminosity of 3.0fb$^{-1}$ recorded by the LHCb experiment. The decay proceeds at leading order via a $b\to s\bar{s}s$ loop transition and is therefore sensitive to the possible presence of particles beyond the Standard Model. A first observation is reported with a significance of $5.9$ standard deviations. The value of the branching fraction is measured to be $(5.18\pm1.04\pm0.35\,^{+0.67}_{-0.62})\times10^{-6}$, where the first uncertainty is statistical, the second is systematic, and the third is related to external inputs. Triple-product asymmetries are measured to be consistent with zero.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01285948
Contributor : Danielle Cristofol <>
Submitted on : Thursday, March 10, 2016 - 9:49:35 AM
Last modification on : Friday, September 17, 2021 - 4:32:02 PM

### Citation

R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi, Z. Ajaltouni, et al.. Observation of the $\Lambda_b^0\to\Lambda\phi$ decay. Physics Letters B, Elsevier, 2016, 759, pp.282-292. ⟨10.1016/j.physletb.2016.05.077⟩. ⟨in2p3-01285948⟩

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