Amplitude analysis of B+→J/ψφK+ decays

Abstract : The first full amplitude analysis of B+→J/ψϕK+ with J/ψ→μ+μ−, ϕ→K+K− decays is performed with a data sample of 3 fb−1 of pp collision data collected at s√=7 and 8 TeV with the LHCb detector. The data cannot be described by a model that contains only excited kaon states decaying into ϕK+, and four J/ψϕ structures are observed, each with significance over 5 standard deviations. The quantum numbers of these structures are determined with significance of at least 4 standard deviations. The lightest is best described as a D±sD∗∓s cusp, but a resonant interpretation is also possible with mass consistent with, but width much larger than, previous measurements of the claimed X(4140) state. The model includes significant contributions from a number of expected kaon excitations, including the first observation of the K∗(1680)+→ϕK+ transition.
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Submitted on : Wednesday, June 29, 2016 - 11:17:32 AM
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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Amplitude analysis of B+→J/ψφK+ decays. Physical Review D, American Physical Society, 2017, 95, pp.012002 ⟨10.1103/PhysRevD.95.012002⟩. ⟨in2p3-01338803⟩

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