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Amplitude analysis of B+ →j /ψφK+ decays
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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 has 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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LHCb Collaboration, et al. Amplitude analysis of B+ →j /ψφK+ decays. Physical Review D. 2017. Vol. 2021, num. 1-64. ISSN 2470-0010. [consulted: 5 of August of 2026]. Available at: https://hdl.handle.net/2445/186563