%0 Journal Article
%T Observation of the suppressed decay Lambda(0)(b) -> p pi(-) mu(+) mu(-)
%A LHCb Collaboration (Aaij, R. et al
%A Garcia Martin, L. M.
%A Martinez-Vidal, F.
%A Oyanguren, A.
%A Remon Alepuz, C.
%A Ruiz Valls, P.
%A Sanchez Mayordomo, C.
%J Journal of High Energy Physics
%D 2017
%V 04
%N 4
%I Springer
%@ 1029-8479
%G English
%F LHCbCollaborationAaij_etal2017
%O WOS:000399274800001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3070), last updated on Thu, 11 May 2017 16:22:37 +0000
%X The suppressed decay Lambda(0)(b) -> p pi(-) mu(+) mu(-), excluding the J/psi and psi(2S) -> mu(+) mu(-) 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 3 fb(-1) collected with the LHCb experiment. The Lambda(0)(b) -> p pi(-) mu(+) mu(-) branching fraction is measured relative to the Lambda(0)(b) -> J/psi (-> mu(+) mu(-)) p pi(-) branching fraction giving B (Lambda(0)(b) -> p pi(-) mu(+) mu(-))/B(Lambda(0)(b) -> J/psi (-> mu(+) mu(-)) p pi(-)) = 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.
%K B physics
%K Branching fraction
%K Flavour Changing Neutral Currents
%K Hadron-Hadron scattering (experiments)
%K Rare decay
%R 10.1007/JHEP04(2017)029
%U http://arxiv.org/abs/1701.08705
%U https://doi.org/10.1007/JHEP04(2017)029
%P 029-16pp