Observation of the suppressed decay Λ0 b → pπ−μ+μ−

• Main Authors: The LHCb Collaboration (Author), Boettcher, Thomas Julian (Author), Ilten, Philip J (Author), Williams, M. (Author)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: 2022-08-15T19:39:11Z.
• Subjects: Article
• Online Access: Get fulltext

 © 2017, The Author(s). The suppressed decay Λb0→ 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 3 fb−1collected with the LHCb experiment. The Λb0→ pπ−μ+μ−branching fraction is measured relative to the Λb0→ J/ψ(→μ+μ−)pπ−branching fraction givingℬ(Λb0→pπ−μ+μ−)ℬ(Λb0→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.[Figure not available: see fulltext.]