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Aaij, R.; Beaucourt, L.; Chefdeville, M.; Decamp, D.; Déléage, N.; Ghez, P.; Marchand, J.-F.; Minard, M.-N.; Pietrzyk, B.; t'Jampens, S.; Tisserand, V.; Tournefier, E.; Ajaltouni, Z.J.; Baalouch, M.; Cogneras, E.; Deschamps, O.; Gazzoni, G.; Gándara, M. Grabalosa; Hadjivasiliou, C.; Henrard, P.; Kozeiha, M.; Lefèvre, R.; Maratas, J.; Monteil, S.; Perret, P.; Vernet, M.; Arnau Romeu, J.; Aslanides, E.; Cogan, J.; Bruyn, K. De; Kanso, W.; Legac, R.; Leroy, O.; Mancinelli, G.; Martin, M.; Mordà, A.; Serrano, J.; Tayduganov, A.; Tsaregorodtsev, A.
The journal of high energy physics, 04/2017, Letnik: 1704Journal Article
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 givingB(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.
