# name
Observation of the suppressed decay Λ b 0 → pπ - μ + μ -

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The suppressed decay Λ b 0 → pπ - μ + μ -, excluding the J/ ψ and ψ(2 S) → 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 3 fb-1 collected with the LHCb experiment. The Λ b 0 → pπ - μ + μ - branching fraction is measured relative to the Λ b 0 → J/ ψ(→ μ + μ -) pπ - branching fraction giving B({Λ}_b^0\to p{π}^{-/μ+{μ}-)}{B({Λ}_b^0\to J/ψ (\to {μ}+{μ}-)p{π}-)}=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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Journal of High Energy Physics, 2017, vol. 2017, num. 29, p. 1-16

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cc-by (c) Camboni, Alessandro et al., 2017

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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Large Hadron Collider (France and Switzerland)

# metadata.dc.title[].value
Observation of the suppressed decay Λ b 0 → pπ - μ + μ -