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      Amplitude analysis of \(B^+\to J/\psi \phi K^+\) decays

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          Abstract

          The first full amplitude analysis of \(B^+\to J/\psi \phi K^+\) with \(J/\psi\to\mu^+\mu^-\), \(\phi\to K^+K^-\) 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 \(\phi K^+\), and four \(J/\psi\phi\) 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 \(D_s^{\pm}D_s^{*\mp}\) 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 \(K^{*}(1680)^+\to\phi K^+\) transition.

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                Author and article information

                Journal
                2016-06-25
                Article
                1606.07898
                0c36f203-0544-4f19-b07e-cdcf01b97daa

                http://creativecommons.org/licenses/by/4.0/

                History
                Custom metadata
                LHCb-PAPER-2016-019, CERN-EP-2016-156
                61 pages 26 figures
                hep-ex

                High energy & Particle physics
                High energy & Particle physics

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