Observation of the suppressed decay Λ0b→pπ−μ+μ−

Abstract : The suppressed decay Λ0b→pπ−μ+μ−, excluding the J/ψ and ψ(2S)→μ+μ− resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of 3fb−1 collected with the LHCb experiment. The Λ0b→pπ−μ+μ− branching fraction is measured relative to the Λ0b→J/ψ(→μ+μ−)pπ− branching fraction giving B(Λ0b→pπ−μ+μ−)B(Λ0b→J/ψ(→μ+μ−)pπ−)=0.044±0.012±0.007, where the first uncertainty is statistical and the second is systematic. This is the first observation of a b→d transition in a baryonic decay.
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Submitted on : Tuesday, January 31, 2017 - 10:15:54 AM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Observation of the suppressed decay Λ0b→pπ−μ+μ−. Journal of High Energy Physics, Springer Verlag (Germany), 2017, 1704, pp.029. ⟨10.1007/JHEP04(2017)029⟩. ⟨in2p3-01450275⟩

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