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Model-independent evidence for J/ψp contributions to Λ0b→J/ψpK− decays

Abstract : The data sample of Λ0b→J/ψpK− decays acquired with the LHCb detector from 7 and 8~TeV pp collisions, corresponding to an integrated luminosity of 3 fb−1, is inspected for the presence of J/ψp or J/ψK− contributions with minimal assumptions about K−p contributions. It is demonstrated at more than 9 standard deviations that Λ0b→J/ψpK− decays cannot be described with K−p contributions alone, and that J/ψp contributions play a dominant role in this incompatibility. These model-independent results support the previously obtained model-dependent evidence for P+c→J/ψp charmonium-pentaquark states in the same data sample.
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Contributor : Claudine Bombar <>
Submitted on : Wednesday, April 20, 2016 - 9:31:44 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:15 PM

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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Model-independent evidence for J/ψp contributions to Λ0b→J/ψpK− decays. Physical Review Letters, American Physical Society, 2016, 117, pp.082002 ⟨10.1103/PhysRevLett.117.082002⟩. ⟨in2p3-01304639⟩



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