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 sqrt[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 has mass consistent with, but width much larger than, previous measurements of the claimed X(4140) state.

Observation of J/ψϕ Structures Consistent with Exotic States from Amplitude Analysis of B^+→J/ψϕK^+ Decays

Veltri, M;
2017-01-01

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 sqrt[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 has mass consistent with, but width much larger than, previous measurements of the claimed X(4140) state.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2657307
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